Altair
AcuSolve -EDEM coupling sequence for
bi-directional coupled simulations is shown below.
Figure 1.
Note: The detailed DEM simulation sequence is not shown here. For detailed information
about the DEM simulation sequence, refer to the EDEM
help manual.
Note:
The temperature and species equations are only solved when the heat transfer
and/or mass transfer physics models are active.
Since the DEM time step is usually multiple orders lower than the CFD time
step, the DEM solver loop is repeated multiple times per single CFD time
step to ensure that the physical time is synchronized in both the
solvers.
For coupled simulations, the data is always exchanged in SI units.
For unidirectional coupling, once the coupling forces are calculated and
shared with EDEM , the fluid momentum equation is
not updated with the coupling force because the effect of particles on fluid
is ignored.
AcuSolve-EDEM coupling uses the Eulerian-Lagrangian
approach for modeling fluid-particle flows where the fluid transport equations are
solved in an Eulerian framework and the dispersed phase is represented as Lagrangian
particles. The fluid phase is solved based on the volume-averaged Navier-Stokes
equations and the Discrete Element Method (DEM) is used for computing the motion of
the solid phase. This coupling strategy allows you to study the momentum and heat
transfer at the individual particle scale.
Governing Equations
The volume-averaged Navier-Stokes equations for CFD-DEM momentum coupling are given
by:
(1)
∂
(
ε
f
ρ
f
)
∂
t
+
∇
⋅
(
ρ
f
ε
f
u
f
)
=
0
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
WaaSaaa8aabaWdbiabgkGi2kaacIcacqaH1oqzpaWaaSbaaSqaa8qa
caWGMbaapaqabaGccqaHbpGCdaWgaaWcbaGaamOzaaqabaGccaGGPa
aabaWdbiabgkGi2kaadshaaaGaey4kaSIaey4bIeTaeyyXICTaaiik
a8aacqaHbpGCdaWgaaWcbaGaamOzaaqabaGcpeGaeqyTdu2damaaBa
aaleaapeGaamOzaaWdaeqaaGqabOWdbiaa=vhadaWgaaWcbaGaamOz
aaqabaGcpaGaaiyka8qacqGH9aqpcaaIWaaaaa@514E@
(2)
∂
∂
t
ε
f
ρ
f
v
f
+
∇
⋅
ρ
f
ε
f
v
f
v
f
=
−
ε
f
∇
p
−
ε
f
∇
⋅
τ
f
+
ρ
f
ε
f
g
−
F
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
WaaSaaa8aabaWdbiabgkGi2cWdaeaapeGaeyOaIyRaamiDaaaadaqa
daWdaeaapeGaeqyTdu2damaaBaaaleaapeGaamOzaaWdaeqaaOWdbi
abeg8aYnaaBaaaleaacaWGMbaabeaaieqak8aacaWF2bWaaSbaaSqa
aiaadAgaaeqaaaGcpeGaayjkaiaawMcaaiabgUcaRiabgEGirlabgw
Sixpaabmaapaqaa8qacqaHbpGCdaWgaaWcbaGaamOzaaqabaGccqaH
1oqzpaWaaSbaaSqaa8qacaWGMbaapaqabaGccaWF2bWaaSbaaSqaai
aadAgaaeqaaOGaa8NDamaaBaaaleaacaWGMbaabeaaaOWdbiaawIca
caGLPaaacqGH9aqpcqGHsislcqaH1oqzpaWaaSbaaSqaa8qacaWGMb
aapaqabaGcpeGaey4bIeTaamiCaiabgkHiTiabew7aL9aadaWgaaWc
baWdbiaadAgaa8aabeaak8qacaGGGcGaey4bIeTaeyyXIC9aaeWaa8
aabaaccmWdbiab+r8a0naaBaaaleaacaWGMbaabeaaaOGaayjkaiaa
wMcaaiabgUcaRiabeg8aYnaaBaaaleaacaWGMbaabeaakiabew7aL9
aadaWgaaWcbaWdbiaadAgaa8aabeaak8qacaWFNbGaeyOeI0ccbmGa
a0Nra8aadaWgaaWcbaWdbiaadchaa8aabeaaaaa@740B@
where,
ε
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaeqyTdu2damaaBaaaleaapeGaamOzaaWdaeqaaOWdbiaacckaaaa@3A33@
is the fluid volume fraction or
porosity;
v
f
MathType@MTEF@5@5@+=
feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqabiaa=zhada
WgaaWcbaGaamOzaaqabaaaaa@3800@
is the fluid velocity;
ρ
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaeqyWdi3damaaBaaaleaapeGaamOzaaWdaeqaaOWdbiaacckaaaa@3A4C@
is the fluid density;
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamiCaaaa@36FE@
is the fluid pressure;
τ
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGGadabaaaaaaa
aapeGae8hXdq3aaSbaaSqaaiaadAgaaeqaaaaa@38ED@
is the viscous stress tensor;
g
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqababaaaaaaa
aapeGaa83zaaaa@36FB@
is the gravity vector;
F
p
=
1
V
c
e
l
l
∑
i
f
d
+
f
l
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOra8aadaWgaaWcbaWdbiaadchaa8aabeaak8qacqGH9aqpcaqG
GcWaaSaaa8aabaWdbiaaigdaa8aabaWdbiaadAfapaWaaSbaaSqaa8
qacaWGJbGaamyzaiaadYgacaWGSbaapaqabaaaaOWdbmaavababeWc
paqaa8qacaWGPbaabeqdpaqaa8qacqGHris5aaGcdaqadaWdaeaape
GaamOza8aadaahaaWcbeqaa8qacaWGKbaaaOGaey4kaSIaamOza8aa
daahaaWcbeqaa8qacaWGSbaaaaGccaGLOaGaayzkaaWdamaaBaaale
aapeGaamyAaaWdaeqaaaaa@4BC0@
is the particle-fluid force exchange
term;
V
c
e
l
l
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOva8aadaWgaaWcbaWdbiaadogacaWGLbGaamiBaiaadYgaa8aa
beaaaaa@3AF2@
is the volume of fluid cell;
f
d
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaahaaWcbeqaa8qacaWGKbaaaaaa@3829@
is the fluid drag force;
f
l
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaahaaWcbeqaa8qacaWGSbaaaaaa@3831@
is the fluid lift force.
Note: Wherever applicable the following notations are used throughout the
document. The subscript
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOzaaaa@36F4@
denotes a fluid property,
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamiCaaaa@36FE@
denotes a particle property and
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamyAaaaa@36F7@
denotes that the calculation is done for an
individual particle.
Drag Models
The drag models available in
AcuSolve -
EDEM coupling are listed below:
Ergun-Wen Yu:The Ergun-Wen Yu model, also known as the Gidaspow model,
reads as:
(3)
f
i
d
=
A
1
−
ε
f
18
ε
f
2
+
B
18
ε
f
2
Re
i
ε
f
≤
0.8
C
d
24
Re
i
ε
f
−
3.65
ε
f
>
0.8
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaqhaaWcbaWdbiaadMgaa8aabaWdbiaadsgaaaGccqGH
9aqpcaGGGcWaaiqaa8aabaqbaeqabiqaaaqaa8qadaWcaaWdaeaape
Gaamyqamaabmaapaqaa8qacaaIXaGaeyOeI0IaeqyTdu2damaaBaaa
leaapeGaamOzaaWdaeqaaaGcpeGaayjkaiaawMcaaaWdaeaapeGaaG
ymaiaaiIdacqaH1oqzpaWaa0baaSqaa8qacaWGMbaapaqaa8qacaaI
YaaaaaaakiabgUcaRmaalaaapaqaa8qacaWGcbaapaqaa8qacaaIXa
GaaGioaiabew7aL9aadaqhaaWcbaWdbiaadAgaa8aabaWdbiaaikda
aaaaaOGaaeOuaiaabwgadaWgaaWcbaGaamyAaaqabaGccaGGGcGaai
iOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGG
GcGaaiiOaiaacckacaGGGcGaeqyTdu2damaaBaaaleaapeGaamOzaa
WdaeqaaOWdbiabgsMiJkaaicdacaGGUaGaaGioaaWdaeaapeWaaSaa
a8aabaWdbiaadoeapaWaaSbaaSqaa8qacaWGKbaapaqabaaakeaape
GaaGOmaiaaisdaaaGaaeOuaiaabwgadaWgaaWcbaGaamyAaaqabaGc
caaMc8UaeqyTdu2damaaDaaaleaapeGaamOzaaWdaeaapeGaeyOeI0
IaaG4maiaac6cacaaI2aGaaGynaaaakiaacckacaGGGcGaaiiOaiaa
cckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaai
iOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGG
GcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacc
kacqaH1oqzpaWaaSbaaSqaa8qacaWGMbaapaqabaGcpeGaeyOpa4Ja
aGimaiaac6cacaaI4aaaaaGaay5Eaaaaaa@9E96@
where
Re
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaaeOuaiaabwgadaWgaaWcbaGaamyAaaqabaaaaa@38E0@
is the particle Reynolds number
Re
i
=
ρ
f
ε
f
v
f
−
v
p
d
p
μ
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaaeOuaiaabwgadaWgaaWcbaGaamyAaaqabaGccqGH9aqpdaWcaaWd
aeaapeGaeqyWdi3damaaBaaaleaapeGaamOzaaWdaeqaaOWdbiabew
7aL9aadaWgaaWcbaWdbiaadAgaa8aabeaak8qadaabdaWdaeaaieqa
caWF2bWaaSbaaSqaaiaadAgaaeqaaOWdbiabgkHiTiaa=zhapaWaaS
baaSqaa8qacaWGWbaapaqabaaak8qacaGLhWUaayjcSdGaamiza8aa
daWgaaWcbaWdbiaadchaa8aabeaaaOqaa8qacqaH8oqBpaWaaSbaaS
qaa8qacaWGMbaapaqabaaaaaaa@4E41@
.
v
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqababaaaaaaa
aapeGaa8NDa8aadaWgaaWcbaWdbiaadchaa8aabeaaaaa@3859@
is the particle velocity and
d
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamiza8aadaWgaaWcbaWdbiaadchaa8aabeaaaaa@3841@
is the particle’s volume equivalent
sphere diameter, A = 150 and B = 1.75. The values of these coefficients
can be modified by you while specifying the model
inputs.
(4)
C
d
=
24
Re
i
1
+
0.15
Re
i
0.687
Re
i
≤
1000
0.44
Re
i
>
1000
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabeaak8qacqGH9aqpcaGG
GcWaaiqaa8aabaqbaeqabiqaaaqaa8qadaWcaaWdaeaapeGaaGOmai
aaisdaa8aabaWdbiaabkfacaqGLbWaaSbaaSqaaiaadMgaaeqaaaaa
kmaabmaapaqaa8qacaaIXaGaey4kaSIaaGimaiaac6cacaaIXaGaaG
ynaiaaykW7caqGsbGaaeyza8aadaqhaaWcbaGaamyAaaqaa8qacaaI
WaGaaiOlaiaaiAdacaaI4aGaaG4naaaaaOGaayjkaiaawMcaaiaacc
kacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiO
aiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGc
GaaiiOaiaacckacaGGGcGaaiiOaiaacckacaqGsbGaaeyzamaaBaaa
leaacaWGPbaabeaakiabgsMiJkaaigdacaaIWaGaaGimaiaaicdaa8
aabaWdbiaaicdacaGGUaGaaGinaiaaisdacaGGGcGaaiiOaiaaccka
caGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOai
aacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGa
aiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckaca
GGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaa
cckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaai
iOaiaacckacaGGGcGaaiiOaiaabkfacaqGLbWaaSbaaSqaaiaadMga
aeqaaOGaeyOpa4JaaGymaiaaicdacaaIWaGaaGimaaaaaiaawUhaaa
aa@AEB9@
here
C
d
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabeaaaaa@3814@
is the drag coefficient.
The
Ergun-Wen-Yu model is one of the most widely used drag models and is
recommended for most of the fluid-particle flows since it works well for
both dense phase and dilute phase regimes. In this model, the Ergun
equation is used for fluid volume fractions less than 0.8 and the Wen-Yu
equation for fluid volume fractions greater than 0.8.
DiFelice(5)
f
i
d
=
C
d
24
Re
i
ε
f
−
χ
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaqhaaWcbaWdbiaadMgaa8aabaWdbiaadsgaaaGccqGH
9aqpdaWcaaWdaeaapeGaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabe
aaaOqaa8qacaaIYaGaaGinaaaacaqGsbGaaeyzamaaBaaaleaacaWG
PbaabeaakiaabccacqaH1oqzpaWaa0baaSqaa8qacaWGMbaapaqaa8
qacqGHsislcqaHhpWyaaaaaa@4739@
where,
(6)
χ
=
3.7
−
0.65
e
−
0.5
1.5
−
log
10
Re
i
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaeq4XdmMaeyypa0JaaG4maiaac6cacaaI3aGaeyOeI0IaaGimaiaa
c6cacaaI2aGaaGynaiaaykW7caWGLbWdamaaCaaaleqabaWdbmaabm
aapaqaa8qacqGHsislcaaIWaGaaiOlaiaaiwdadaqadaWdaeaapeGa
aGymaiaac6cacaaI1aGaeyOeI0IaciiBaiaac+gacaGGNbWdamaaBa
aameaapeGaaGymaiaaicdaa8aabeaal8qacaqGsbGaaeyza8aadaWg
aaadbaWdbiaadMgaa8aabeaaaSWdbiaawIcacaGLPaaapaWaaWbaaW
qabeaapeGaaGOmaaaaaSGaayjkaiaawMcaaaaaaaa@5400@
(7)
C
d
=
0.63
+
4.8
Re
i
−
0.5
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabeaak8qacqGH9aqpcaGG
GcWaaeWaa8aabaWdbiaaicdacaGGUaGaaGOnaiaaiodacqGHRaWkca
aI0aGaaiOlaiaaiIdacaqGsbGaaeyza8aadaqhaaWcbaGaamyAaaqa
a8qacqGHsislcaaIWaGaaiOlaiaaiwdaaaaakiaawIcacaGLPaaapa
WaaWbaaSqabeaapeGaaGOmaaaaaaa@491E@
Unlike the Ergun-Wen-Yu correlation, the Di
Felice correlation is a monotonic function of Reynolds number and
porosity and does not have the step change in drag force
evaluation.
Beetstra(8)
f
i
d
=
180
(
1
−
ε
f
)
18
ε
f
2
+
ε
f
2
1
+
1.5
(
1
−
ε
f
)
+
0.413
24
ε
f
2
ε
f
−
1
+
3
(
1
−
ε
f
)
ε
f
+
8.4
Re
i
−
0.343
1
+
10
3
(
1
−
ε
f
)
Re
i
−
1
+
4
(
1
−
ε
f
)
/
2
Re
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaqhaaWcbaWdbiaadMgaa8aabaWdbiaadsgaaaGccqGH
9aqpdaqadaWdaeaapeWaaSaaa8aabaWdbiaaigdacaaI4aGaaGimai
aacIcacaaIXaGaeyOeI0IaeqyTdu2damaaBaaaleaapeGaamOzaaWd
aeqaaOGaaiykaaqaa8qacaaIXaGaaGioaiabew7aL9aadaqhaaWcba
WdbiaadAgaa8aabaWdbiaaikdaaaaaaaGccaGLOaGaayzkaaGaey4k
aSIaeqyTdu2damaaDaaaleaapeGaamOzaaWdaeaapeGaaGOmaaaakm
aabmaapaqaa8qacaaIXaGaey4kaSIaaGymaiaac6cacaaI1aWaaOaa
a8aabaWdbiaacIcacaaIXaGaeyOeI0IaeqyTdu2damaaBaaaleaape
GaamOzaaWdaeqaaOGaaiykaaWcpeqabaaakiaawIcacaGLPaaacqGH
RaWkdaqadaWdaeaapeWaaSaaa8aabaWdbiaaicdacaGGUaGaaGinai
aaigdacaaIZaaapaqaa8qacaaIYaGaaGinaiabew7aL9aadaqhaaWc
baWdbiaadAgaa8aabaWdbiaaikdaaaaaaaGccaGLOaGaayzkaaWaae
Waa8aabaWdbmaalaaapaqaa8qacqaH1oqzpaWaa0baaSqaa8qacaWG
Mbaapaqaa8qacqGHsislcaaIXaaaaOGaey4kaSIaaG4maiaacIcaca
aIXaGaeyOeI0IaeqyTdu2damaaBaaaleaapeGaamOzaaWdaeqaaOGa
aiyka8qacqaH1oqzpaWaaSbaaSqaa8qacaWGMbaapaqabaGcpeGaey
4kaSIaaGioaiaac6cacaaI0aGaaeOuaiaabwgapaWaa0baaSqaaiaa
dMgaaeaapeGaeyOeI0IaaGimaiaac6cacaaIZaGaaGinaiaaiodaaa
aak8aabaWdbiaaigdacqGHRaWkcaaIXaGaaGima8aadaahaaWcbeqa
a8qacaaIZaGaaiikaiaaigdacqGHsislcqaH1oqzpaWaaSbaaWqaa8
qacaWGMbaapaqabaWccaGGPaaaaOWdbiaabkfacaqGLbWdamaaDaaa
leaacaWGPbaabaWdbiabgkHiTmaabmaapaqaa8qacaaIXaGaey4kaS
IaaGinaiaacIcacaaIXaGaeyOeI0IaeqyTdu2damaaBaaameaapeGa
amOzaaWdaeqaaSGaaiykaaWdbiaawIcacaGLPaaacaGGVaGaaGOmaa
aaaaaakiaawIcacaGLPaaacaqGsbGaaeyzamaaBaaaleaacaWGPbaa
beaaaaa@9E18@
Rong(9)
f
i
d
=
0.5
C
d
π
d
e
2
4
ρ
f
v
f
−
v
p
v
f
−
v
p
ε
f
2
−
β
−
λ
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaqhaaWcbaWdbiaadMgaa8aabaWdbiaadsgaaaGccqGH
9aqpcaaIWaGaaiOlaiaaiwdacaWGdbWdamaaBaaaleaapeGaamizaa
WdaeqaaOWdbmaalaaapaqaa8qacqaHapaCcaWGKbWdamaaDaaaleaa
peGaamyzaaWdaeaapeGaaGOmaaaaaOWdaeaapeGaaGinaaaacqaHbp
GCdaWgaaWcbaGaamOzaaqabaGcdaabdaWdaeaaieqacaWF2bWaaSba
aSqaaiaadAgaaeqaaOWdbiabgkHiTiaa=zhapaWaaSbaaSqaa8qaca
WGWbaapaqabaaak8qacaGLhWUaayjcSdWaaeWaa8aabaGaa8NDamaa
BaaaleaacaWGMbaabeaak8qacqGHsislcaWF2bWdamaaBaaaleaape
GaamiCaaWdaeqaaaGcpeGaayjkaiaawMcaaiabew7aL9aadaqhaaWc
baWdbiaadAgaa8aabaWdbiaaikdacqGHsislcqaHYoGycqGHsislcq
aH7oaBaaaaaa@5FE9@
where,
(10)
β
=
2.65
ε
f
+
1
−
5.3
−
3.5
ε
f
ε
f
2
e
−
(
1.5
−
log
10
Re
i
)
2
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaeqOSdiMaeyypa0JaaGOmaiaac6cacaaI2aGaaGynamaabmaapaqa
a8qacqaH1oqzpaWaaSbaaSqaa8qacaWGMbaapaqabaGcpeGaey4kaS
IaaGymaaGaayjkaiaawMcaaiabgkHiTmaabmaapaqaa8qacaaI1aGa
aiOlaiaaiodacqGHsislcaaIZaGaaiOlaiaaiwdacqaH1oqzpaWaaS
baaSqaa8qacaWGMbaapaqabaaak8qacaGLOaGaayzkaaGaaiiOaiab
ew7aL9aadaqhaaWcbaWdbiaadAgaa8aabaWdbiaaikdaaaGcpaGaaG
PaV=qacaWGLbWdamaaCaaaleqabaWdbmaadmaapaqaa8qacqGHsisl
daWcaaWdaeaapeGaaiikaiaaigdacaGGUaGaaGynaiabgkHiTiGacY
gacaGGVbGaai4za8aadaWgaaadbaWdbiaaigdacaaIWaaapaqabaWc
peGaaeOuaiaabwgadaWgaaadbaGaamyAaaqabaWccaGGPaWdamaaCa
aameqabaWdbiaaikdaaaaal8aabaWdbiaaikdaaaaacaGLBbGaayzx
aaaaaaaa@65BF@
(11)
λ
=
1
−
ε
f
C
−
D
e
−
0.5
3.5
−
log
10
Re
i
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaeq4UdWMaeyypa0ZaaeWaa8aabaWdbiaaigdacqGHsislcqaH1oqz
paWaaSbaaSqaa8qacaWGMbaapaqabaaak8qacaGLOaGaayzkaaWaae
Waa8aabaWdbiaadoeacqGHsislcaWGebGaaGzaVlaaygW7caaMc8Ua
aGPaVlaadwgapaWaaWbaaSqabeaapeGaeyOeI0IaaGimaiaac6caca
aI1aWaaeWaa8aabaWdbiaaiodacaGGUaGaaGynaiabgkHiTiGacYga
caGGVbGaai4za8aadaWgaaadbaWdbiaaigdacaaIWaaapaqabaWcpe
GaaeOuaiaabwgadaWgaaadbaGaamyAaaqabaaaliaawIcacaGLPaaa
paWaaWbaaWqabeaapeGaaGOmaaaaliaacckaaaaakiaawIcacaGLPa
aaaaa@5C5A@
(12)
C
=
39
φ
−
20.6
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qaiabg2da9iaacckacaaIZaGaaGyoaiabeA8aQjabgkHiTiaa
ikdacaaIWaGaaiOlaiaaiAdaaaa@400D@
(13)
D
=
101.8
φ
−
0.81
2
+
2.4
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamiraiabg2da9iaaigdacaaIWaGaaGymaiaac6cacaaI4aWaaeWa
a8aabaWdbiabeA8aQjabgkHiTiaaicdacaGGUaGaaGioaiaaigdaai
aawIcacaGLPaaapaWaaWbaaSqabeaapeGaaGOmaaaakiabgUcaRiaa
ikdacaGGUaGaaGinaaaa@46D7@
φ
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaeqOXdOgaaa@37C6@
is the sphericity of the particle,
d
e
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamiza8aadaWgaaWcbaWdbiaadwgaa8aabeaaaaa@3836@
is the diameter of volume equivalent
sphere.
Since the sphericity of the particle is considered while
calculating the drag force, this model is strongly recommended for
non-spherical particles compared to the other models available in
AcuSolve .
Syamlal-O’BrienThe correlation reads as:
(14)
f
i
d
=
C
d
Re
i
ε
f
24
v
r
,
p
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaqhaaWcbaWdbiaadMgaa8aabaWdbiaadsgaaaGccqGH
9aqpdaWcaaWdaeaapeGaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabe
aak8qacaqGsbGaaeyza8aadaWgaaWcbaWdbiaadMgaa8aabeaak8qa
cqaH1oqzpaWaaSbaaSqaa8qacaWGMbaapaqabaaakeaapeGaaGOmai
aaisdaieqacaWF2bWdamaaDaaaleaapeGaamOCaiaacYcacaWGWbaa
paqaa8qacaaIYaaaaaaaaaa@48FD@
where,
(15)
C
d
=
0.63
+
4.8
Re
i
v
r
,
s
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabeaak8qacqGH9aqpcaGG
GcWaaeWaa8aabaWdbiaaicdacaGGUaGaaGOnaiaaiodacqGHRaWkda
WcaaWdaeaapeGaaGinaiaac6cacaaI4aaapaqaa8qadaGcaaWdaeaa
peWaaSGaa8aabaWdbiaabkfacaqGLbWdamaaBaaaleaapeGaamyAaa
WdaeqaaaGcbaacbeWdbiaa=zhapaWaaSbaaSqaa8qacaWGYbGaaiil
aiaadohaa8aabeaaaaaapeqabaaaaaGccaGLOaGaayzkaaWdamaaCa
aaleqabaWdbiaaikdaaaaaaa@4AE6@
(16)
v
r
,
s
=
A
−
0.06
Re
i
+
0.06
Re
i
2
+
0.12
2
B
−
A
+
A
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqababaaaaaaa
aapeGaa8NDa8aadaWgaaWcbaWdbiaadkhacaGGSaGaam4CaaWdaeqa
aOWdbiabg2da9maabmaapaqaa8qacaWGbbGaeyOeI0IaaGimaiaac6
cacaaIWaGaaGOnaiaabkfacaqGLbWdamaaBaaaleaapeGaamyAaaWd
aeqaaOWdbiabgUcaRmaakaaapaqaa8qadaqadaWdaeaapeGaaGimai
aac6cacaaIWaGaaGOnaiaabkfacaqGLbWdamaaBaaaleaapeGaamyA
aaWdaeqaaaGcpeGaayjkaiaawMcaa8aadaahaaWcbeqaa8qacaaIYa
aaaOGaey4kaSIaaGimaiaac6cacaaIXaGaaGOmamaabmaapaqaa8qa
caaIYaGaamOqaiabgkHiTiaadgeaaiaawIcacaGLPaaacqGHRaWkca
WGbbWdamaaCaaaleqabaWdbiaaikdaaaaabeaaaOGaayjkaiaawMca
aaaa@59B0@
(17)
A
=
ε
f
4.14
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamyqaiabg2da9iaacckacqaH1oqzpaWaa0baaSqaa8qacaWGMbaa
paqaa8qacaaI0aGaaiOlaiaaigdacaaI0aaaaaaa@3EDF@
(18)
B
=
0.8
ε
f
1.28
ε
f
≤
0.85
ε
f
2.65
ε
f
≥
0.85
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOqaiabg2da9iaacckadaGabaWdaeaafaqabeGabaaabaWdbiaa
icdacaGGUaGaaGioaiabew7aL9aadaqhaaWcbaWdbiaadAgaa8aaba
WdbiaaigdacaGGUaGaaGOmaiaaiIdaaaGccaGGGcGaaGPaVlaaykW7
caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVl
aaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8Ua
aGPaVlabew7aL9aadaWgaaWcbaWdbiaadAgaa8aabeaak8qacqGHKj
YOcaaIWaGaaiOlaiaaiIdacaaI1aaapaqaa8qacqaH1oqzpaWaa0ba
aSqaa8qacaWGMbaapaqaa8qacaaIYaGaaiOlaiaaiAdacaaI1aaaaO
GaaiiOaiaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7
caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVl
aaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8Ua
aGPaVlaaykW7cqaH1oqzpaWaaSbaaSqaa8qacaWGMbaapaqabaGcpe
GaeyyzImRaaGimaiaac6cacaaI4aGaaGynaiaaykW7aaaacaGL7baa
aaa@9F8B@
Wen-YuThe Wen-Yu correlation reads as:
(19)
f
i
d
=
C
d
24
Re
i
ε
f
−
3.65
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaqhaaWcbaWdbiaadMgaa8aabaWdbiaadsgaaaGccqGH
9aqpcaGGGcWaaSaaa8aabaWdbiaadoeapaWaaSbaaSqaa8qacaWGKb
aapaqabaaakeaapeGaaGOmaiaaisdaaaGaaeOuaiaabwgapaWaaSba
aSqaa8qacaWGPbaapaqabaGcpeGaeqyTdu2damaaDaaaleaapeGaam
OzaaWdaeaapeGaeyOeI0IaaG4maiaac6cacaaI2aGaaGynaaaaaaa@492F@
(20)
C
d
=
24
Re
i
1
+
0.15
Re
i
0.687
Re
i
≤
1000
0.44
Re
i
>
1000
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabeaak8qacqGH9aqpcaGG
GcWaaiqaa8aabaqbaeqabiqaaaqaa8qadaWcaaWdaeaapeGaaGOmai
aaisdaa8aabaWdbiaabkfacaqGLbWdamaaBaaaleaapeGaamyAaaWd
aeqaaaaak8qadaqadaWdaeaapeGaaGymaiabgUcaRiaaicdacaGGUa
GaaGymaiaaiwdacaqGsbGaaeyza8aadaqhaaWcbaWdbiaadMgaa8aa
baWdbiaaicdacaGGUaGaaGOnaiaaiIdacaaI3aaaaaGccaGLOaGaay
zkaaGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaa
cckacaGGGcGaaiiOaiaacckacaaMc8UaaGPaVlaaykW7caaMc8UaaG
PaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaiiOaiaacckacaGG
GcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacc
kacaGGGcGaaeOuaiaabwgapaWaaSbaaSqaa8qacaWGPbaapaqabaGc
peGaeyizImQaaGymaiaaicdacaaIWaGaaGimaaWdaeaapeGaaGimai
aac6cacaaI0aGaaGinaiaacckacaGGGcGaaiiOaiaacckacaGGGcGa
aiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckaca
GGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaa
cckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaai
iOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGG
GcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacc
kacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiO
aiaacckacaqGsbGaaeyza8aadaWgaaWcbaWdbiaadMgaa8aabeaak8
qacqGH+aGpcaaIXaGaaGimaiaaicdacaaIWaaaaaGaay5Eaaaaaa@C7B9@
Schiller NaumanThe correlation reads as:
(21)
f
i
d
=
C
d
24
Re
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOza8aadaqhaaWcbaWdbiaadMgaa8aabaWdbiaadsgaaaGccqGH
9aqpcaGGGcWaaSaaa8aabaWdbiaadoeapaWaaSbaaSqaa8qacaWGKb
aapaqabaaakeaapeGaaGOmaiaaisdaaaGaaeOuaiaabwgapaWaaSba
aSqaa8qacaWGPbaapaqabaaaaa@423D@
(22)
C
d
=
24
1
+
0.15
Re
i
0.687
Re
i
≤
1000
0.44
Re
i
>
1000
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabeaak8qacqGH9aqpcaGG
GcWaaiqaa8aabaqbaeqabiqaaaqaa8qacaaIYaGaaGinamaabmaapa
qaa8qacaaIXaGaey4kaSIaaGimaiaac6cacaaIXaGaaGynaiaabkfa
caqGLbWdamaaDaaaleaapeGaamyAaaWdaeaapeGaaGimaiaac6caca
aI2aGaaGioaiaaiEdaaaaakiaawIcacaGLPaaacaGGGcGaaiiOaiaa
cckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaaykW7caaMc8UaaG
PaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaM
c8UaaGPaVlaaykW7caGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacc
kacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiO
aiaacckacaqGsbGaaeyza8aadaWgaaWcbaWdbiaadMgaa8aabeaak8
qacqGHKjYOcaaIXaGaaGimaiaaicdacaaIWaaapaqaa8qacaaIWaGa
aiOlaiaaisdacaaI0aGaaiiOaiaacckacaGGGcGaaiiOaiaacckaca
GGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaa
cckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaai
iOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGG
GcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacc
kacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiO
aiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGc
GaaiiOaiaabkfacaqGLbWdamaaBaaaleaapeGaamyAaaWdaeqaaOWd
biabg6da+iaaigdacaaIWaGaaGimaiaaicdaaaaacaGL7baaaaa@C8ED@
The drag force calculated does not consider the
effect of surrounding particles, that is, volume fraction is not
accounted for, and hence this model is strictly valid only for dilute
phase flows.
Non-Spherical Drag Coefficient Models
The effect of a particle’s shape can be taken into account by using non-spherical
drag coefficient models. There are two types of models available in
AcuSolve which are listed below. If the non-spherical drag
coefficient model is set to none the particles are assumed to be of spherical shape.
Isometric (Haider Levenspiel)In this model the drag coefficient is
considered to be a function of particle Reynolds number and sphericity.
The instantaneous orientation of the particle is not taken into account.
This type of model is applicable for particles with shapes closer to a
sphere such as rocks, some grains (beans), and when the orientation of
the particles is not critical. The user inputs required for this model
are particle’s volume and sphericity. The Haider-Levenspiel correlation
is given by:
(23)
C
d
n
s
=
24
Re
i
1
+
A
1
Re
i
A
2
+
A
3
1
+
A
4
Re
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabeaakmaaCaaaleqabaWd
biaad6gacaWGZbaaaOGaeyypa0JaaiiOamaalaaapaqaa8qacaaIYa
GaaGinaaWdaeaapeGaaeOuaiaabwgapaWaa0baaSqaa8qacaWGPbaa
paqaaaaaaaGcpeWaamWaa8aabaWdbiaaigdacqGHRaWkcaWGbbWdam
aaBaaaleaapeGaaGymaaWdaeqaaOWdbmaabmaapaqaa8qacaqGsbGa
aeyza8aadaqhaaWcbaWdbiaadMgaa8aabaaaaaGcpeGaayjkaiaawM
caa8aadaahaaWcbeqaa8qacaWGbbWdamaaBaaameaapeGaaGOmaaWd
aeqaaaaaaOWdbiaawUfacaGLDbaacqGHRaWkdaWcaaWdaeaapeGaam
yqa8aadaWgaaWcbaWdbiaaiodaa8aabeaaaOqaa8qacaaIXaGaey4k
aSYaaSGaa8aabaWdbiaadgeapaWaaSbaaSqaa8qacaaI0aaapaqaba
aakeaapeGaaeOuaiaabwgapaWaa0baaSqaa8qacaWGPbaapaqaaaaa
aaaaaaaa@57E4@
where,
(24)
A
1
=
e
2.3288
−
6.4581
φ
i
+
2.4486
φ
i
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamyqa8aadaWgaaWcbaWdbiaaigdaa8aabeaak8qacqGH9aqpcaWG
LbWdamaaCaaaleqabaWdbmaabmaapaqaa8qacaaIYaGaaiOlaiaaio
dacaaIYaGaaGioaiaaiIdacqGHsislcaaI2aGaaiOlaiaaisdacaaI
1aGaaGioaiaaigdacqaHgpGApaWaaSbaaWqaa8qacaWGPbaapaqaba
WcpeGaey4kaSIaaGOmaiaac6cacaaI0aGaaGinaiaaiIdacaaI2aGa
eqOXdO2damaaDaaameaapeGaamyAaaWdaeaapeGaaGOmaaaaaSGaay
jkaiaawMcaaaaaaaa@51F3@
(25)
A
2
=
0.0964
+
0.5565
φ
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamyqa8aadaWgaaWcbaWdbiaaikdaa8aabeaak8qacqGH9aqpcaaI
WaGaaiOlaiaaicdacaaI5aGaaGOnaiaaisdacqGHRaWkcaaIWaGaai
OlaiaaiwdacaaI1aGaaGOnaiaaiwdacqaHgpGApaWaaSbaaSqaa8qa
caWGPbaapaqabaaaaa@45BC@
(26)
A
3
=
73.69
e
−
5.0748
φ
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamyqa8aadaWgaaWcbaWdbiaaiodaa8aabeaak8qacqGH9aqpcaaI
3aGaaG4maiaac6cacaaI2aGaaGyoaiaadwgapaWaaWbaaSqabeaape
WaaeWaa8aabaWdbiabgkHiTiaaiwdacaGGUaGaaGimaiaaiEdacaaI
0aGaaGioaiabeA8aQ9aadaWgaaadbaWdbiaadMgaa8aabeaaaSWdbi
aawIcacaGLPaaaaaaaaa@4811@
(27)
A
4
=
5.378
e
6.2122
φ
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamyqa8aadaWgaaWcbaWdbiaaisdaa8aabeaak8qacqGH9aqpcaaI
1aGaaiOlaiaaiodacaaI3aGaaGioaiaadwgapaWaaWbaaSqabeaape
WaaeWaa8aabaWdbiaaiAdacaGGUaGaaGOmaiaaigdacaaIYaGaaGOm
aiabeA8aQ9aadaWgaaadbaWdbiaadMgaa8aabeaaaSWdbiaawIcaca
GLPaaaaaaaaa@4718@
Non-spherical (Ganser and Holzer-Sommerfeld)The Ganser and
Holzer-Sommerfeld models consider both the shape and orientation of the
particle. Since the orientation of the particles is also considered,
this model is applicable to particle shapes such as disk, ellipsoid and
elongated cylinder. The user inputs for these models are volume and
aspect ratio of the particles.
The Ganser correlation is given
by:
(28)
C
d
n
s
k
2
=
24
k
1
k
2
Re
i
1
+
0.1118
k
1
k
2
Re
i
0.65657
+
0.4305
1
+
3305
k
1
k
2
Re
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
WaaSaaa8aabaWdbiaadoeapaWaaSbaaSqaa8qacaWGKbaapaqabaGc
daahaaWcbeqaa8qacaWGUbGaam4CaaaaaOWdaeaapeGaam4Aa8aada
WgaaWcbaWdbiaaikdaa8aabeaaaaGcpeGaeyypa0JaaiiOamaalaaa
paqaa8qacaaIYaGaaGinaaWdaeaapeGaam4Aa8aadaWgaaWcbaWdbi
aaigdaa8aabeaak8qacaWGRbWdamaaBaaaleaapeGaaGOmaaWdaeqa
aOWdbiaabkfacaqGLbWdamaaDaaaleaapeGaamyAaaWdaeaaaaaaaO
Wdbmaadmaapaqaa8qacaaIXaGaey4kaSIaaGimaiaac6cacaaIXaGa
aGymaiaaigdacaaI4aWaaeWaa8aabaWdbiaadUgapaWaaSbaaSqaa8
qacaaIXaaapaqabaGcpeGaam4Aa8aadaWgaaWcbaWdbiaaikdaa8aa
beaak8qacaqGsbGaaeyza8aadaqhaaWcbaWdbiaadMgaa8aabaaaaa
GcpeGaayjkaiaawMcaa8aadaahaaWcbeqaa8qacaaIWaGaaiOlaiaa
iAdacaaI1aGaaGOnaiaaiwdacaaI3aaaaaGccaGLBbGaayzxaaGaey
4kaSYaaSaaa8aabaWdbiaaicdacaGGUaGaaGinaiaaiodacaaIWaGa
aGynaaWdaeaapeGaaGymaiabgUcaRmaaliaapaqaa8qacaaIZaGaaG
4maiaaicdacaaI1aaapaqaa8qacaWGRbWdamaaBaaaleaapeGaaGym
aaWdaeqaaOWdbiaadUgapaWaaSbaaSqaa8qacaaIYaaapaqabaGcpe
GaaeOuaiaabwgapaWaa0baaSqaa8qacaWGPbaapaqaaaaaaaaaaaaa
@7059@
Here
k
1
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4Aa8aadaWgaaWcbaWdbiaaigdaa8aabeaaaaa@380E@
and
k
2
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4Aa8aadaWgaaWcbaWdbiaaikdaa8aabeaaaaa@380F@
are Stokes and Newton shape factors
respectively.
The Holzer-Sommerfeld correlation is given
by:
(29)
C
d
n
s
=
8
Re
i
1
φ
i
⊥
+
16
Re
i
1
φ
i
+
3
Re
i
1
φ
i
3
4
+
0.42
×
10
0.4
−
log
10
φ
i
2
1
φ
i
⊥
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadsgaa8aabeaakmaaCaaaleqabaWd
biaad6gacaWGZbaaaOGaeyypa0JaaiiOamaalaaapaqaa8qacaaI4a
aapaqaa8qacaqGsbGaaeyza8aadaqhaaWcbaWdbiaadMgaa8aabaaa
aaaak8qadaWcaaWdaeaapeGaaGymaaWdaeaapeWaaOaaa8aabaWdbi
abeA8aQnaaBaaaleaacaWGPbaabeaak8aadaahaaWcbeqaa8qacqGH
LkIxaaaabeaaaaGccqGHRaWkdaWcaaWdaeaapeGaaGymaiaaiAdaa8
aabaWdbiaabkfacaqGLbWdamaaDaaaleaapeGaamyAaaWdaeaaaaaa
aOWdbmaalaaapaqaa8qacaaIXaaapaqaa8qadaGcaaWdaeaapeGaeq
OXdO2aaSbaaSqaaiaadMgaaeqaaaqabaaaaOGaey4kaSYaaSaaa8aa
baWdbiaaiodaa8aabaWdbmaakaaapaqaa8qacaqGsbGaaeyza8aada
qhaaWcbaWdbiaadMgaa8aabaaaaaWdbeqaaaaakmaalaaapaqaa8qa
caaIXaaapaqaa8qacqaHgpGApaWaa0baaSqaa8qacaWGPbaapaqaa8
qadaWccaWdaeaapeGaaG4maaWdaeaapeGaaGinaaaaaaaaaOGaey4k
aSIaaiiOaiaaicdacaGGUaGaaGinaiaaikdacaaMc8Uaey41aqRaaG
PaVlaaigdacaaIWaWdamaaCaaaleqabaWdbiaaicdacaGGUaGaaGin
amaabmaapaqaa8qacqGHsislciGGSbGaai4BaiaacEgapaWaaSbaaW
qaa8qacaaIXaGaaGimaaWdaeqaaSWdbiabeA8aQ9aadaWgaaadbaWd
biaadMgaa8aabeaaaSWdbiaawIcacaGLPaaapaWaaWbaaWqabeaape
GaaGOmaaaaaaGcdaWcaaWdaeaapeGaaGymaaWdaeaapeGaeqOXdO2a
aSbaaSqaaiaadMgaaeqaaOWdamaaCaaaleqabaWdbiabgwQiEbaaaa
aaaa@7B4D@
where,
φ
⊥
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaeqOXdO2damaaCaaaleqabaWdbiabgwQiEbaaaaa@39C3@
is the crosswise sphericity which is
defined as the ratio of projected area of the volume equivalent sphere
to the projected area of the particle perpendicular to the
flow.
Lift Models
Generally the lift force acts in a direction normal to the relative motion of the
fluid and particle. The two components of the lift force considered are Saffman
force and Magnus force. The Saffman lift force is due to the pressure gradient on a
non-rotating particle in the presence of a non-uniform shear velocity field while
the Magnus lift force is due to the particle rotation in a uniform flow. Unlike
spherical particles, the behavior of non-spherical particles in turbulent flows is
much more complicated and the lift force acting on them can no longer be neglected.
As the particle’s principal axis becomes inclined with the flow direction, the
effect of lift force on the particle motion becomes significant.
There are three lift models available in
AcuSolve :
Saffman-MagnusThis model is for spherical particles and hence the
orientation is neglected whereas the last two models take the particle
orientation into account while calculating the lift forces.
The
correlation for the Saffman force is given by:
(30)
f
→
i
S
a
f
f
m
a
n
=
SLC
×
C
l
s
w
i
d
i
2
μ
f
ρ
f
ω
−
0.5
w
i
×
ω
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GabmOza8aagaWcamaaDaaaleaapeGaamyAaaWdaeaapeGaam4uaiaa
dggacaWGMbGaamOzaiaad2gacaWGHbGaamOBaaaakiabg2da9iaabo
facaqGmbGaae4qaiabgEna0kaadoeapaWaaSbaaSqaa8qacaWGSbGa
am4CaaWdaeqaaGqabOGaa83DamaaBaaaleaacaWGPbaabeaak8qaca
WGKbWdamaaDaaaleaapeGaamyAaaWdaeaapeGaaGOmaaaakmaakaaa
paqaa8qacqaH8oqBpaWaaSbaaSqaa8qacaWGMbaapaqabaGcpeGaeq
yWdi3damaaBaaaleaapeGaamOzaaWdaeqaaaWdbeqaaOWaaqWaa8aa
baaccmWdbiab+L8a3bGaay5bSlaawIa7a8aadaahaaWcbeqaa8qacq
GHsislcaaIWaGaaiOlaiaaiwdaaaGcdaqadaWdaeaacaWF3bWaaSba
aSqaaiaadMgaaeqaaOWdbiabgEna0kab+L8a3bGaayjkaiaawMcaaa
aa@632B@
where
ω
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGGadabaaaaaaa
aapeGae8xYdChaaa@37DE@
is the particle velocity curl,
w
i
MathType@MTEF@5@5@+=
feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqababaaaaaaa
aapeGaa83DamaaBaaaleaacaWGPbaabeaaaaa@3824@
is the slip velocity of the particle.
SLC is Saffman constant with a default value of 1.615. This value can be
modified while specifying the model inputs.
C
l
s
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadYgacaWGZbaapaqabaaaaa@3914@
is the Saffman lift coefficient and is
given by the expression:
(31)
C
l
s
=
e
−
0.1
Re
i
+
0.3314
γ
i
1
−
e
−
0.1
Re
i
Re
i
≤
40
0.0524
γ
i
Re
i
Re
i
>
40
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadYgacaWGZbaapaqabaGcpeGaeyyp
a0Zaaiqaa8aabaqbaeqabiqaaaqaa8qacaWGLbWdamaaCaaaleqaba
WdbiabgkHiTiaaicdacaGGUaGaaGymaiaabkfacaqGLbWdamaaBaaa
meaapeGaamyAaaWdaeqaaaaak8qacqGHRaWkcaaIWaGaaiOlaiaaio
dacaaIZaGaaGymaiaaisdacaGGGcWaaOaaa8aabaWdbiabeo7aN9aa
daWgaaWcbaWdbiaadMgaa8aabeaaa8qabeaakmaabmaapaqaa8qaca
aIXaGaeyOeI0Iaamyza8aadaahaaWcbeqaa8qacqGHsislcaaIWaGa
aiOlaiaaigdacaqGsbGaaeyza8aadaWgaaadbaWdbiaadMgaa8aabe
aaaaaak8qacaGLOaGaayzkaaGaaiiOaiaacckacaaMc8UaaGPaVlaa
ykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaG
PaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaM
c8UaaGPaVlaacckacaGGGcGaaeOuaiaabwgapaWaaSbaaSqaa8qaca
WGPbaapaqabaGcpeGaeyizImQaaGinaiaaicdaa8aabaWdbiaaicda
caGGUaGaaGimaiaaiwdacaaIYaGaaGinamaakaaapaqaa8qacqaHZo
WzpaWaaSbaaSqaa8qacaWGPbaapaqabaGcpeGaaeOuaiaabwgapaWa
aSbaaSqaa8qacaWGPbaapaqabaaapeqabaGccaGGGcGaaiiOaiaacc
kacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiO
aiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaGPaVlaaykW7caaMc8
UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7
caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVl
aaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8Ua
aGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7ca
aMc8UaaGPaVlaaykW7caqGsbGaaeyza8aadaWgaaWcbaWdbiaadMga
a8aabeaak8qacqGH+aGpcaaI0aGaaGimaaaaaiaawUhaaaaa@DE49@
(32)
γ
i
=
ω
d
i
2
w
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaeq4SdC2damaaBaaaleaapeGaamyAaaWdaeqaaOWdbiabg2da9maa
laaapaqaa8qadaabdaWdaeaaiiWacqWFjpWDa8qacaGLhWUaayjcSd
Gaamiza8aadaWgaaWcbaWdbiaadMgaa8aabeaaaOqaa8qacaaIYaWa
aqWaa8aabaWdbiaabEhadaWgaaWcbaGaamyAaaqabaaakiaawEa7ca
GLiWoaaaaaaa@47C3@
The correlation for the Magnus force is given
by:
(33)
f
→
i
M
a
g
n
u
s
=
M
L
C
×
C
l
m
w
i
2
π
d
i
2
ρ
f
μ
f
ρ
f
ω
r
×
w
i
ω
r
w
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GabmOza8aagaWcamaaDaaaleaapeGaamyAaaWdaeaapeGaamytaiaa
dggacaWGNbGaamOBaiaadwhacaWGZbaaaOGaeyypa0JaamytaiaadY
eacaWGdbGaey41aqRaam4qa8aadaWgaaWcbaWdbiaadYgacaWGTbaa
paqabaacbeGccaWF3bWaa0baaSqaaiaadMgaaeaacaaIYaaaaOWdbi
abec8aWjaadsgapaWaa0baaSqaa8qacaWGPbaapaqaa8qacaaIYaaa
aOGaeqyWdi3damaaBaaaleaapeGaamOzaaWdaeqaaOWdbmaakaaapa
qaa8qacqaH8oqBpaWaaSbaaSqaa8qacaWGMbaapaqabaGcpeGaeqyW
di3damaaBaaaleaapeGaamOzaaWdaeqaaaWdbeqaaOWaaSaaa8aaba
WdbmaabmaapaqaaGGad8qacqGFjpWDdaWgaaWcbaGaamOCaaqabaGc
cqGHxdaTcaWF3bWaaSbaaSqaaiaadMgaaeqaaaGccaGLOaGaayzkaa
aapaqaa8qadaabdaWdaeaapeGae4xYdC3aaSbaaSqaaiaadkhaaeqa
aaGccaGLhWUaayjcSdWaaqWaa8aabaWdbiaa=DhadaWgaaWcbaGaam
yAaaqabaaakiaawEa7caGLiWoaaaaaaa@6C7F@
(34)
ω
r
=
1
2
ω
−
ω
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGGadiab=L8a3n
aaBaaaleaaqaaaaaaaaaWdbiaadkhaa8aabeaak8qacqGH9aqpdaWc
aaWdaeaapeGaaGymaaWdaeaapeGaaGOmaaaapaGae8xYdC3dbiabgk
HiT8aacqWFjpWDdaWgaaWcbaGaamyAaaqabaaaaa@41BA@
where MLC is Magnus constant with a default
value of 0.125. This value can be modified while specifying the model
inputs.
C
l
m
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadYgacaWGTbaapaqabaaaaa@390E@
is the Magnus lift coefficient and is
given by the expression:
(35)
C
l
m
=
d
i
ω
r
w
i
1
Re
i
≤
1
0.178
+
0.822
Re
i
−
0.522
Re
i
>
1
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4qa8aadaWgaaWcbaWdbiaadYgacaWGTbaapaqabaGcpeGaeyyp
a0Jaamiza8aadaWgaaWcbaWdbiaadMgaa8aabeaak8qadaWcaaWdae
aapeWaaqWaa8aabaaccmWdbiab=L8a3naaBaaaleaacaWGYbaabeaa
aOGaay5bSlaawIa7aaWdaeaapeWaaqWaa8aabaacbeWdbiaa+Dhada
WgaaWcbaGaamyAaaqabaaakiaawEa7caGLiWoaaaWaaiqaa8aabaqb
aeqabiqaaaqaa8qacaaIXaGaaiiOaiaacckacaGGGcGaaGPaVlaayk
W7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPa
VlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8
UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7
caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVl
aaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8Ua
aGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7ca
aMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaa
ykW7caaMc8UaaGPaVlaacckacaqGsbGaaeyza8aadaWgaaWcbaWdbi
aadMgaa8aabeaak8qacqGHKjYOcaaIXaaapaqaa8qadaqadaWdaeaa
peGaaGimaiaac6cacaaIXaGaaG4naiaaiIdacqGHRaWkcaaIWaGaai
OlaiaaiIdacaaIYaGaaGOmaiaabkfacaqGLbWdamaaDaaaleaapeGa
amyAaaWdaeaapeGaeyOeI0IaaGimaiaac6cacaaI1aGaaGOmaiaaik
daaaaakiaawIcacaGLPaaacaGGGcGaaiiOaiaacckacaGGGcGaaiiO
aiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGc
GaaiiOaiaacckacaqGsbGaaeyza8aadaWgaaWcbaWdbiaadMgaa8aa
beaak8qacqGH+aGpcaaIXaaaaaGaay5Eaaaaaa@DA56@
Saffman-Magnus non-spherical liftThis is similar to the Saffman Magnus
lift model for spherical lift, except the lift coefficients are replaced
by the nonspherical lift coefficient which is explained in the
nonspherical lift model section below.
Non-spherical liftIn this model, the lift coefficient is assumed to be
proportional to the drag coefficient and the correlation for the lift
force is given by:
(36)
F
L
=
1
2
C
L
ρ
f
π
4
d
p
2
v
f
−
v
i
2
C
L
C
D
=
sin
2
α
⋅
cos
α
in Newton Law region
C
L
C
D
=
sin
2
α
⋅
cos
α
0.65
+
40
Re
0.72
(
30
<
Re
<
1500
)
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamOra8aadaWgaaWcbaWdbiaadYeaa8aabeaak8qacqGH9aqpcaGG
GcWaaSaaa8aabaWdbiaaigdaa8aabaWdbiaaikdaaaGaam4qa8aada
WgaaWcbaWdbiaadYeaa8aabeaak8qacqaHbpGCpaWaaSbaaSqaa8qa
caWGMbaapaqabaGcpeWaaSaaa8aabaWdbiabec8aWbWdaeaapeGaaG
inaaaacaWGKbWdamaaDaaaleaapeGaamiCaaWdaeaapeGaaGOmaaaa
kmaaemaapaqaaGqab8qacaWF2bWdamaaBaaaleaapeGaamOzaaWdae
qaaOWdbiabgkHiTiaa=zhapaWaaSbaaSqaa8qacaWGPbaapaqabaaa
k8qacaGLhWUaayjcSdWdamaaCaaaleqabaWdbiaaikdaaaGccaGGGc
Waaiqaa8aabaqbaeqabiqaaaqaa8qadaWcaaWdaeaapeGaam4qa8aa
daWgaaWcbaWdbiaadYeaa8aabeaaaOqaa8qacaWGdbWdamaaBaaale
aapeGaamiraaWdaeqaaaaak8qacqGH9aqpciGGZbGaaiyAaiaac6ga
paWaaWbaaSqabeaapeGaaGOmaaaakiabeg7aHjabgwSixlGacogaca
GGVbGaai4Caiabeg7aHjaacckacaGGGcGaaiiOaiaacckacaaMc8Ua
aGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7ca
aMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaa
ykW7caaMc8UaaGPaVlaaykW7caaMc8+aaeWaa8aabaWdbiaabMgaca
qGUbGaaeiOaiaab6eacaqGLbGaae4DaiaabshacaqGVbGaaeOBaiaa
bccacaqGmbGaaeyyaiaabEhacaqGGcGaaeOCaiaabwgacaqGNbGaae
yAaiaab+gacaqGUbaacaGLOaGaayzkaaGaaGPaVlaaykW7caaMc8Ua
aGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7ca
aMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8oapaqaa8qa
daWcaaWdaeaapeGaam4qa8aadaWgaaWcbaWdbiaadYeaa8aabeaaaO
qaa8qacaWGdbWdamaaBaaaleaapeGaamiraaWdaeqaaaaak8qacqGH
9aqpdaWcaaWdaeaapeGaci4CaiaacMgacaGGUbWdamaaCaaaleqaba
WdbiaaikdaaaGccqaHXoqycqGHflY1ciGGJbGaai4BaiaacohacqaH
Xoqya8aabaWdbiaaicdacaGGUaGaaGOnaiaaiwdacqGHRaWkcaaI0a
GaaGimaiaabkfacaqGLbWdamaaCaaaleqabaWdbiaaicdacaGGUaGa
aG4naiaaikdaaaaaaOGaaiiOaiaaykW7caaMc8UaaGPaVlaaykW7ca
aMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaa
ykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaG
PaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaM
c8UaaGPaVlaaykW7caGGOaGaaG4maiaaicdacqGH8aapcaqGsbGaae
yzaiabgYda8iaaigdacaaI1aGaaGimaiaaicdacaGGPaGaaGPaVlaa
ykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaG
PaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaM
c8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7aaaacaGL7baaaaa@35B4@
Here the drag coefficient is obtained from the
drag force calculation. The direction of the lift force is given
by:
(37)
e
^
L
o
=
u
i
⋅
v
′
f
i
u
i
⋅
v
′
f
i
u
i
×
v
′
f
i
×
v
′
f
i
u
i
×
v
′
f
i
×
v
′
f
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gabmyza8aagaqcamaaBaaaleaapeGaamita8aadaWgaaadbaWdbiaa
d+gaa8aabeaaaSqabaGcpeGaeyypa0JaaiiOamaalaaapaqaaGqab8
qacaWF1bWdamaaBaaaleaapeGaamyAaaWdaeqaaOWdbiabgwSixlqa
dAhapaGbauaadaWgaaWcbaWdbiaadAgacaWGPbaapaqabaaakeaape
WaaqWaa8aabaWdbiaa=vhapaWaaSbaaSqaa8qacaWGPbaapaqabaGc
peGaeyyXICTabmODa8aagaqbamaaBaaaleaapeGaamOzaiaadMgaa8
aabeaaaOWdbiaawEa7caGLiWoaaaWaaSaaa8aabaWdbmaabmaapaqa
a8qacaWF1bWdamaaBaaaleaapeGaamyAaaWdaeqaaOWdbiabgEna0k
qadAhapaGbauaadaWgaaWcbaWdbiaadAgacaWGPbaapaqabaaak8qa
caGLOaGaayzkaaGaey41aqRabmODa8aagaqbamaaBaaaleaapeGaam
OzaiaadMgaa8aabeaaaOqaa8qadaqadaWdaeaapeGaa8xDa8aadaWg
aaWcbaWdbiaadMgaa8aabeaak8qacqGHxdaTceWG2bWdayaafaWaaS
baaSqaa8qacaWGMbGaamyAaaWdaeqaaaGcpeGaayjkaiaawMcaaiab
gEna0kqadAhapaGbauaadaWgaaWcbaWdbiaadAgacaWGPbaapaqaba
aaaaaa@6CE4@
where,
u
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamyDa8aadaWgaaWcbaWdbiaadMgaa8aabeaaaaa@384B@
is the particle principal axis and
v
′
f
i
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GabmODa8aagaqbamaaBaaaleaapeGaamOzaiaadMgaa8aabeaaaaa@3943@
is the relative velocity vector of the
particle.
Torque Models
By using the torque models, the rotational drag force on the rotating particles due
to the inertia of fluid can be considered. The three types of torque models
available in
AcuSolve are pitching torque, rotational
torque and a combination of both.
Pitching torqueWhen the center of pressure
xcp acting on a
non-spherical particle does not coincide with the center of mass of the
particle
xcm , a
hydrodynamic pitching torque (also known as offset torque) results and
acts around the axis perpendicular to the plane of relative fluid
velocity and particle orientation vector. The pitching torque can change
the angle of incidence of the particle. The expression used for
calculating the pitching torque is given by:
(38)
T
=
Δ
x
×
F
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqadabaaaaaaa
aapeGaa8hvaiabg2da9iabgs5aejaadIhacqGHxdaTcaWFgbaaaa@3D32@
where,
Δ
x
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaeyiLdqKaamiEaaaa@386D@
is the distance between the center of
pressure and the center of mass of the particle and is given by the
expression:
(39)
Δ
x
=
L
4
1
−
sin
α
3
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaeyiLdqKaamiEaiabg2da9maalaaapaqaa8qacaWGmbaapaqaa8qa
caaI0aaaamaabmaapaqaa8qacaaIXaGaeyOeI0YaaeWaa8aabaWdbi
GacohacaGGPbGaaiOBaiabeg7aHbGaayjkaiaawMcaa8aadaahaaWc
beqaa8qacaaIZaaaaaGccaGLOaGaayzkaaaaaa@45D2@
Where,
L
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamitaaaa@36DA@
is the length of the particle and
α
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaeqySdegaaa@37A8@
is the angle of inclination of the
particle.
F
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqadabaaaaaaa
aapeGaa8Nraaaa@36DC@
is the total aerodynamic force (sum of
drag and lift force) acting on the particle.
Rotational torqueA particle experiences rotational torque, also known as
rolling friction torque, when there is a difference between the local
fluid rotation and the angular velocity of the particle. The rotational
torque is applied at the center of mass of the particle and is given by
the expression:
(40)
T
=
ρ
f
2
d
p
2
5
c
r
1
2
∇
×
v
f
−
ω
p
1
2
∇
×
v
f
−
ω
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqadabaaaaaaa
aapeGaa8hvaiabg2da9maalaaapaqaa8qacqaHbpGCpaWaaSbaaSqa
a8qacaWGMbaapaqabaaakeaapeGaaGOmaaaadaqadaWdaeaapeWaaS
aaa8aabaWdbiaadsgapaWaaSbaaSqaa8qacaWGWbaapaqabaaakeaa
peGaaGOmaaaaaiaawIcacaGLPaaapaWaaWbaaSqabeaapeGaaGynaa
aakiaadogapaWaaSbaaSqaa8qacaWGYbaapaqabaGcpeWaaqWaa8aa
baWdbmaalaaapaqaa8qacaaIXaaapaqaa8qacaaIYaaaaiabgEGirl
abgEna0Iqabiaa+zhadaWgaaWcbaGaamOzaaqabaGccqGHsisliiWa
cqqFjpWDdaWgaaWcbaGaamiCaaqabaaakiaawEa7caGLiWoadaqada
WdaeaapeWaaSaaa8aabaWdbiaaigdaa8aabaWdbiaaikdaaaGaey4b
IeTaey41aqRaa4NDamaaBaaaleaacaWGMbaabeaakiabgkHiTiab9L
8a3naaBaaaleaacaWGWbaabeaaaOGaayjkaiaawMcaaaaa@5FF5@
(41)
c
r
=
64
π
Re
r
Re
r
≤
32
12.9
Re
r
0.5
+
128.4
Re
r
32
≪
Re
r
≪
1000
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaam4ya8aadaWgaaWcbaWdbiaadkhaa8aabeaak8qacqGH9aqpdaGa
baWdaeaafaqabeGabaaabaWdbmaalaaapaqaa8qacaaI2aGaaGinai
abec8aWbWdaeaapeGaaeOuaiaabwgapaWaaSbaaSqaa8qacaWGYbaa
paqabaaaaOWdbiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaGPaVl
aaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8Ua
aGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7ca
aMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaa
ykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8Uaai
iOaiaacckacaaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaM
c8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaayk
W7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPa
VlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaiiOaiaabkfacaqGLb
WdamaaBaaaleaapeGaamOCaaWdaeqaaOWdbiabgsMiJkaaiodacaaI
Yaaapaqaa8qadaWcaaWdaeaapeGaaGymaiaaikdacaGGUaGaaGyoaa
WdaeaapeGaaeOuaiaabwgapaWaa0baaSqaa8qacaWGYbaapaqaa8qa
caaIWaGaaiOlaiaaiwdaaaaaaOGaey4kaSYaaSaaa8aabaWdbiaaig
dacaaIYaGaaGioaiaac6cacaaI0aaapaqaa8qacaqGsbGaaeyza8aa
daWgaaWcbaWdbiaadkhaa8aabeaaaaGcpeGaaiiOaiaacckacaGGGc
GaaiiOaiaacckacaGGGcGaaiiOaiaacckacaGGGcGaaGPaVlaaykW7
caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVl
aaykW7caaMc8UaaGPaVlaaykW7caaMc8UaaGPaVlaaykW7caaMc8Ua
aGPaVlaaykW7caaMc8UaaGPaVlaaiodacaaIYaGaeSOAI0JaaeOuai
aabwgapaWaaSbaaSqaa8qacaWGYbaapaqabaGcpeGaeSOAI0JaaGym
aiaaicdacaaIWaGaaGimaaaaaiaawUhaaaaa@F610@
(42)
Re
r
=
ρ
f
d
p
2
0.5
∇
×
v
f
−
ω
p
μ
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaaeOuaiaabwgapaWaaSbaaSqaa8qacaWGYbaapaqabaGcpeGaeyyp
a0ZaaSaaa8aabaWdbiabeg8aY9aadaWgaaWcbaWdbiaadAgaa8aabe
aak8qacaWGKbWdamaaDaaaleaapeGaamiCaaWdaeaapeGaaGOmaaaa
kmaaemaapaqaa8qacaaIWaGaaiOlaiaaiwdacqGHhis0cqGHxdaTie
qacaWF2bWaaSbaaSqaaiaadAgaaeqaaOGaeyOeI0cccmGae4xYdC3a
aSbaaSqaaiaadchaaeqaaaGccaGLhWUaayjcSdaapaqaa8qacqaH8o
qBaaaaaa@5180@
Here,
v
f
MathType@MTEF@5@5@+=
feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGqabiaa=zhada
WgaaWcbaGaamOzaaqabaaaaa@3800@
is the velocity of the fluid and
ω
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaGGadabaaaaaaa
aapeGae8xYdC3aaSbaaSqaaiaadchaaeqaaaaa@38FF@
is the angular velocity of the
particle.
Pitching rotational torqueWhen the pitching rotational torque model is
selected, both pitching torque and rotational torque are applied on the
particle.
Heat Transfer Governing Equations
When heat transfer is active, in addition to the momentum equation, the energy
conservation equations for the fluid and the particle are solved simultaneously to
obtain the temperature of each phase. The governing equations for obtaining the
temperatures of the particles and fluid are described below:
(43)
∂
∂ t
ρ
ε
f
C
p f
T
f
+ ∇ .
v
f
ρ
f
ε
f
C
p f
T
f
= ∇ .
ε
f
k
f
∇
T
f
+
Q
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
WaaSaaa8aabaWdbiabgkGi2cWdaeaapeGaeyOaIyRaamiDaaaadaqa
daWdaeaapeGaeqyWdiNaeqyTdu2damaaBaaaleaapeGaamOzaaWdae
qaaOWdbiaadoeapaWaaSbaaSqaa8qacaWGWbGaamOzaaWdaeqaaOWd
biaadsfapaWaaSbaaSqaa8qacaWGMbaapaqabaaak8qacaGLOaGaay
zkaaGaey4kaSIaey4bIeTaaiOlamaabmaapaqaaGqabiaa=zhadaWg
aaWcbaGaamOzaaqabaGcpeGaeqyWdi3damaaBaaaleaapeGaamOzaa
WdaeqaaOWdbiabew7aL9aadaWgaaWcbaWdbiaadAgaa8aabeaak8qa
caWGdbWdamaaBaaaleaapeGaamiCaiaadAgaa8aabeaak8qacaWGub
WdamaaBaaaleaapeGaamOzaaWdaeqaaaGcpeGaayjkaiaawMcaaiab
g2da9iaabckacqGHhis0caGGUaWaaeWaa8aabaWdbiabew7aL9aada
WgaaWcbaWdbiaadAgaa8aabeaak8qacaWGRbWdamaaBaaaleaapeGa
amOzaaWdaeqaaOWdbiabgEGirlaadsfapaWaaSbaaSqaa8qacaWGMb
aapaqabaaak8qacaGLOaGaayzkaaGaey4kaSIaamyua8aadaWgaaWc
baWdbiaadchaa8aabeaaaaa@6A5E@
Where
Q
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamyua8aadaWgaaWcbaWdbiaadchaa8aabeaaaaa@382E@
represents the heat source term resulting from the
heat transfer from the particle.
(44)
Q
p
=
∑
i = 0
N
p
h
f p
A
p
T
p
−
T
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamyua8aadaWgaaWcbaWdbiaadchaa8aabeaak8qacqGH9aqpdaGf
WbqabSWdaeaapeGaamyAaiabg2da9iaaicdaa8aabaWdbiaad6eapa
WaaSbaaWqaa8qacaWGWbaapaqabaaaneaapeGaeyyeIuoaaOGaamiA
a8aadaWgaaWcbaWdbiaadAgacaWGWbaapaqabaGcpeGaamyqa8aada
WgaaWcbaWdbiaadchaa8aabeaak8qadaqadaWdaeaapeGaamiva8aa
daWgaaWcbaWdbiaadchaa8aabeaak8qacqGHsislcaWGubWdamaaBa
aaleaapeGaamOzaaWdaeqaaaGcpeGaayjkaiaawMcaaaaa@4D40@
A
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamyqa8aadaWgaaWcbaWdbiaadchaa8aabeaaaaa@381E@
is the surface area of the particle,
T
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamiva8aadaWgaaWcbaWdbiaadchaa8aabeaaaaa@3831@
is the particle temperature and
T
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaamiva8aadaWgaaWcbaWdbiaadAgaa8aabeaaaaa@3827@
is the fluid temperature. The heat transfer
coefficient (
h
f
p
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaamiAa8aadaWgaaWcbaWdbiaadAgacaWGWbaapaqabaaaaa@3930@
) is calculated using the empirical correlation given
by
Nu
p
=
h
f
p
d
p
k
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaaeOtaiaabwhapaWaaSbaaSqaa8qacaWGWbaapaqabaGcpeGaeyyp
a0ZaaSaaa8aabaWdbiaadIgapaWaaSbaaSqaa8qacaWGMbGaamiCaa
WdaeqaaOWdbiaadsgapaWaaSbaaSqaa8qacaWGWbaapaqabaaakeaa
peGaam4Aa8aadaWgaaWcbaWdbiaadAgaa8aabeaaaaaaaa@4238@
where the Nusselt number is calculated using the
following expression:
(45)
Nu
p
=
7 − 10
ε
f
+ 5
ε
f
2
1 + 0.7
Re
p
0.2
Pr
0.33
+
1.33 − 2.40
ε
f
+ 1.20
ε
f
2
Re
p
0.7
Pr
0.33
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaaeOtaiaabwhapaWaaSbaaSqaa8qacaWGWbaapaqabaGcpeGaeyyp
a0ZaaeWaa8aabaWdbiaaiEdacqGHsislcaaIXaGaaGimaiabew7aL9
aadaWgaaWcbaWdbiaadAgaa8aabeaak8qacqGHRaWkcaaI1aGaeqyT
du2damaaBaaaleaapeGaamOzaaWdaeqaaOWaaWbaaSqabeaapeGaaG
OmaaaaaOGaayjkaiaawMcaamaadmaapaqaa8qacaaIXaGaey4kaSIa
aGimaiaac6cacaaI3aGaaeOuaiaabwgapaWaa0baaSqaa8qacaWGWb
aapaqaa8qacaaIWaGaaiOlaiaaikdaaaGccaqGqbGaaeOCa8aadaah
aaWcbeqaa8qacaaIWaGaaiOlaiaaiodacaaIZaaaaaGccaGLBbGaay
zxaaGaey4kaSYaaeWaa8aabaWdbiaaigdacaGGUaGaaG4maiaaioda
cqGHsislcaaIYaGaaiOlaiaaisdacaaIWaGaeqyTdu2damaaBaaale
aapeGaamOzaaWdaeqaaOWdbiabgUcaRiaaigdacaGGUaGaaGOmaiaa
icdacqaH1oqzpaWaaSbaaSqaa8qacaWGMbaapaqabaGcdaahaaWcbe
qaa8qacaaIYaaaaaGccaGLOaGaayzkaaGaaeOuaiaabwgapaWaa0ba
aSqaa8qacaWGWbaapaqaa8qacaaIWaGaaiOlaiaaiEdaaaGccaqGqb
GaaeOCa8aadaahaaWcbeqaa8qacaaIWaGaaiOlaiaaiodacaaIZaaa
aaaa@7630@
Where
Pr
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
Gaaeiuaiaabkhaaaa@37D1@
is the Prandtl number given by
Pr
=
μ
f
C
p
f
k
f
MathType@MTEF@5@5@+=
feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
4rNCHbGeaGqiVCI8FfYJH8YrFfeuY=Hhbbf9v8qqaqFr0xc9pk0xbb
a9q8WqFfeaY=biLkVcLq=JHqpepeea0=as0Fb9pgeaYRXxe9vr0=vr
0=vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape
GaaeiuaiaabkhacqGH9aqpdaWcaaWdaeaapeGaeqiVd02damaaBaaa
leaapeGaamOzaaWdaeqaaOWdbiaadoeapaWaaSbaaSqaa8qacaWGWb
GaamOzaaWdaeqaaaGcbaWdbiaadUgapaWaaSbaaSqaa8qacaWGMbaa
paqabaaaaaaa@416C@
.