Package Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase
Package with utility functions to compute two phase pressure loss characteristics

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Standard package icon.

Extends from Modelica.Icons.FunctionsPackage (Icon for packages containing functions).

Package Contents

Name	Description
`dp_twoPhaseChisholm_DP`	Frictional pressure loss of straight pipe for two phase flow according to Chisholm correlation \| calculate pressure loss \| overall flow regime
`dp_twoPhaseFriedel_DP`	Frictional pressure loss of straight pipe for two phase flow according to Friedel correlation \| calculate pressure loss\| overall flow regime
`dp_twoPhaseGeodetic_DP`	Geodetic pressure loss of straight pipe for two phase flow \| calculate pressure loss
`dp_twoPhaseMomentum_DP`	Momentum pressure loss of straight pipe for two phase flow \| calculate pressure loss
`SlipRatio`	Calculation of (analytical/empirical) slip ratio
`TwoPhaseDensity`	Calculation of mean density for two phase flow
`TwoPhaseMultiplierChisholm`	Calculation of two phase multiplier according to Chisholm \| constant mass flow rate quality
`TwoPhaseMultiplierFriedel`	Calculation of two phase multiplier according to Friedel \| constant mass flow rate quality \| horizontal flow \| vertical upflow and downflow
`VoidFraction`	Calculation of (cross sectional) void fraction for two phase flow

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.dp_twoPhaseChisholm_DP
Frictional pressure loss of straight pipe for two phase flow according to Chisholm correlation | calculate pressure loss | overall flow regime

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`TwoPhaseFlow_con`	`IN_con`
`TwoPhaseFlow_var`	`IN_var`
`MassFlowRate`	`m_flow`	Mass flow rate

Outputs

Type	Name	Description
`Pressure`	`DP`	Output for function dp_twoPhaseChisholm_DP

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.dp_twoPhaseFriedel_DP
Frictional pressure loss of straight pipe for two phase flow according to Friedel correlation | calculate pressure loss| overall flow regime

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`TwoPhaseFlow_con`	`IN_con`
`TwoPhaseFlow_var`	`IN_var`
`MassFlowRate`	`m_flow`	Mass flow rate

Outputs

Type	Name	Description
`Pressure`	`DP`	Output for function dp_twoPhaseFriedel_DP

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.dp_twoPhaseGeodetic_DP
Geodetic pressure loss of straight pipe for two phase flow | calculate pressure loss

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`VoidFractionApproach`	`voidFractionApproach`	Choice of void fraction approach
`Boolean`	`crossSectionalAveraged`	true == cross sectional averaged void fraction \| false == volumetric
`Length`	`length`	Length in fluid flow direction
`Angle`	`phi`	Tilt angle to horizontal
`Density`	`rho_g`	Density of gaseous phase
`Density`	`rho_l`	Density of liquid phase
`Real`	`x_flow`	Mass flow rate quality

Outputs

Type	Name	Description
`Pressure`	`DP_geo`	Geodetic pressure loss

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.dp_twoPhaseMomentum_DP
Momentum pressure loss of straight pipe for two phase flow | calculate pressure loss

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`VoidFractionApproach`	`voidFractionApproach`	Choice of void fraction approach
`Boolean`	`massFlowRateCorrection`	Consider heterogeneous mass flow rate correction
`Area`	`A_cross`	Cross sectional area
`Length`	`perimeter`	Perimeter
`Density`	`rho_g`	Density of gas
`Density`	`rho_l`	Density of liquid
`Real`	`x_flow_end`	Mass flow rate quality at end of length
`Real`	`x_flow_sta`	Mass flow rate quality at start of length
`MassFlowRate`	`m_flow`	Mass flow rate

Outputs

Type	Name	Description
`Pressure`	`DP_mom`	Momentum pressure loss

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.TwoPhaseMultiplierFriedel
Calculation of two phase multiplier according to Friedel | constant mass flow rate quality | horizontal flow | vertical upflow and downflow

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`TwoPhaseFlow_con`	`IN_con`
`TwoPhaseFlow_var`	`IN_var`
`MassFlowRate`	`m_flow`	Mass flow rate

Outputs

Type	Name	Description
`Real`	`phi`	Two phase multiplier w.r.t. Friedel

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.TwoPhaseMultiplierChisholm
Calculation of two phase multiplier according to Chisholm | constant mass flow rate quality

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`TwoPhaseFlow_con`	`IN_con`
`TwoPhaseFlow_var`	`IN_var`
`MassFlowRate`	`m_flow`	Mass flow rate

Outputs

Type	Name	Description
`Real`	`phi`	Two phase multiplier w.r.t. Chisholm

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.TwoPhaseDensity
Calculation of mean density for two phase flow

Information

The gaseous and the liquid part of a fluid in a two phase flow are often discontinuously distributed. This complex behaviour is simplified for engineering calculations. The two phase flow of different fluid flow situations (e.g., bubble or stratified flow) is modelled as if the gaseous and the liquid phase are continuously distributed.

A mean density assuming a continuous distribution out of a discontinuous two phase fluid flow situation can be calculated with a homogeneous or a heterogeneous approach (see dp_twoPhaseOverall_DP).

The following modelling approaches can be used to calculate the mean density of two phase flow:

homogeneous density (homogeneous approach)
momentum flux density (heterogeneous approach)
kinetic energy flow density (heterogeneous approach)

The heterogeneous approaches are analytically derived by minimising the momentum flux or the kinetic energy flow assuming implicitly that the two-phase flow will tend towards the minimum of this quantity.

References

VDI:: VDI - Wärmeatlas: Berechnungsblätter für den Wärmeübergang. Springer Verlag, 10th edition, 2006.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`VoidFractionApproach`	`voidFractionApproach`	Choice of void fraction approach
`Boolean`	`massFlowRateCorrection`	Consider heterogeneous mass flow rate correction
`Density`	`rho_g`	Density of gaseous phase
`Density`	`rho_l`	Density of liquid phase
`Real`	`epsilon_A`	Void fraction (cross sectional averaged)
`Real`	`x_flow`	Mass flow rate quality

Outputs

Type	Name	Description
`Density`	`rho_2ph`	Mean density of two phase flow

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.VoidFraction
Calculation of (cross sectional) void fraction for two phase flow

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`VoidFractionApproach`	`voidFractionApproach`	Choice of void fraction approach
`Boolean`	`crossSectionalAveraged`	true == cross sectional averaged void fraction \| false == volumetric
`Density`	`rho_g`	Density of gaseous phase
`Density`	`rho_l`	Density of liquid phase
`Real`	`x_flow`	Mass flow rate quality

Outputs

Type	Name	Description
`Real`	`epsilon`	Void fraction
`Real`	`slipRatio`	Slip ratio

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.SlipRatio
Calculation of (analytical/empirical) slip ratio

Information

This icon indicates Modelica functions.

Extends from Modelica.Icons.Function (Icon for functions).

Inputs

Type	Name	Description
`VoidFractionApproach`	`voidFractionApproach`	Choice of void fraction approach
`Density`	`rho_g`	Density of gaseous phase
`Density`	`rho_l`	Density of liquid phase
`Real`	`x_flow`	Mass flow rate quality

Outputs

Type	Name	Description
`Real`	`SR`	Slip ratio

Package Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhasePackage with utility functions to compute two phase pressure loss characteristics

Information

Package Contents

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​dp_twoPhaseChisholm_DPFrictional pressure loss of straight pipe for two phase flow according to Chisholm correlation | calculate pressure loss | overall flow regime

Information

Inputs

Outputs

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​dp_twoPhaseFriedel_DPFrictional pressure loss of straight pipe for two phase flow according to Friedel correlation | calculate pressure loss| overall flow regime

Information

Inputs

Outputs

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​dp_twoPhaseGeodetic_DPGeodetic pressure loss of straight pipe for two phase flow | calculate pressure loss

Information

Inputs

Outputs

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​dp_twoPhaseMomentum_DPMomentum pressure loss of straight pipe for two phase flow | calculate pressure loss

Information

Inputs

Outputs

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​TwoPhaseMultiplierFriedelCalculation of two phase multiplier according to Friedel | constant mass flow rate quality | horizontal flow | vertical upflow and downflow

Information

Inputs

Outputs

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​TwoPhaseMultiplierChisholmCalculation of two phase multiplier according to Chisholm | constant mass flow rate quality

Information

Inputs

Outputs

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​TwoPhaseDensityCalculation of mean density for two phase flow

Information

References

Inputs

Outputs

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​VoidFractionCalculation of (cross sectional) void fraction for two phase flow

Information

Inputs

Outputs

Function Modelica.​Fluid.​Dissipation.​Utilities.​Functions.​PressureLoss.​TwoPhase.​SlipRatioCalculation of (analytical/empirical) slip ratio

Information

Inputs

Outputs

Package Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase
Package with utility functions to compute two phase pressure loss characteristics

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.dp_twoPhaseChisholm_DP
Frictional pressure loss of straight pipe for two phase flow according to Chisholm correlation | calculate pressure loss | overall flow regime

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.dp_twoPhaseFriedel_DP
Frictional pressure loss of straight pipe for two phase flow according to Friedel correlation | calculate pressure loss| overall flow regime

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.dp_twoPhaseGeodetic_DP
Geodetic pressure loss of straight pipe for two phase flow | calculate pressure loss

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.dp_twoPhaseMomentum_DP
Momentum pressure loss of straight pipe for two phase flow | calculate pressure loss

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.TwoPhaseMultiplierFriedel
Calculation of two phase multiplier according to Friedel | constant mass flow rate quality | horizontal flow | vertical upflow and downflow

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.TwoPhaseMultiplierChisholm
Calculation of two phase multiplier according to Chisholm | constant mass flow rate quality

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.TwoPhaseDensity
Calculation of mean density for two phase flow

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.VoidFraction
Calculation of (cross sectional) void fraction for two phase flow

Function Modelica.Fluid.Dissipation.Utilities.Functions.PressureLoss.TwoPhase.SlipRatio
Calculation of (analytical/empirical) slip ratio