Package for pressure loss calculation of bends

Calculation of pressure loss in curved bends at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness. See more information.

Calculation of pressure loss in edged bends with sharp corners at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness. See more information .

Extends from `Modelica.Icons.VariantsPackage`

(Icon for package containing variants).

Name | Description |
---|---|

`dp_curvedOverall_DP` | Pressure loss of curved bend | calculate pressure loss | overall flow regime | surface roughness |

`dp_curvedOverall_IN_con` | Input record for function dp_curvedOverall_DP and dp_curvedOverall_MFLOW |

`dp_curvedOverall_IN_var` | Input record for function dp_curvedOverall_DP and dp_curvedOverall_MFLOW |

`dp_curvedOverall_MFLOW` | Pressure loss of curved bend | calculate mass flow rate | overall flow regime | surface roughness |

`dp_edgedOverall_DP` | Pressure loss of edged bend | calculate pressure loss | overall flow regime | surface roughness |

`dp_edgedOverall_IN_con` | Input record for function dp_edgedOverall_DP and dp_edgedOverall_MFLOW |

`dp_edgedOverall_IN_var` | Input record for function dp_edgedOverall_DP and dp_edgedOverall_MFLOW |

`dp_edgedOverall_MFLOW` | Pressure loss of edged bend | calculate mass flow rate | overall flow regime | surface roughness |

Pressure loss of curved bend | calculate pressure loss | overall flow regime | surface roughness

Calculation of pressure loss in curved bends at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness.

Generally this function is numerically best used for the **incompressible case **, where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated. On the other hand the function dp_curvedOverall_MFLOW is numerically best used for the **compressible case **if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated. See more information.

Extends from `Modelica.Icons.Function`

(Icon for functions).

Type | Name | Description |
---|---|---|

`dp_curvedOverall_IN_con` | `IN_con` | Input record for function dp_curvedOverall_DP |

`dp_curvedOverall_IN_var` | `IN_var` | Input record for function dp_curvedOverall_DP |

`MassFlowRate` | `m_flow` | Mass flow rate |

Type | Name | Description |
---|---|---|

`Pressure` | `DP` | Output for function dp_curvedOverall_DP |

Pressure loss of curved bend | calculate mass flow rate | overall flow regime | surface roughness

Calculation of pressure loss in curved bends at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness.

Generally this function is numerically best used for the ** compressible case ** if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated. On the other hand the function dp_curvedOverall_DP is numerically best used for the ** incompressible case **, where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated.
See more information .

Extends from `Modelica.Icons.Function`

(Icon for functions).

Type | Name | Description |
---|---|---|

`dp_curvedOverall_IN_con` | `IN_con` | Input record for function dp_curvedOverall_MFLOW |

`dp_curvedOverall_IN_var` | `IN_var` | Input record for function dp_curvedOverall_MFLOW |

`Pressure` | `dp` | Pressure loss |

Type | Name | Description |
---|---|---|

`MassFlowRate` | `M_FLOW` | Output for function dp_curvedOverall_MFLOW |

Input record for function dp_curvedOverall_DP and dp_curvedOverall_MFLOW

This record is used as ** input record ** for the pressure loss function
dp_curvedOverall_DP
and dp_curvedOverall_MFLOW .

Extends from `Modelica.Fluid.Dissipation.Utilities.Records.PressureLoss.Bend`

(Input for bend).

Type | Name | Description |
---|---|---|

`Diameter` | `d_hyd` | Hydraulic diameter |

`Angle` | `delta` | Angle of turning |

`Length` | `K` | Roughness (absolute average height of surface asperities) |

`Radius` | `R_0` | Curvature radius |

Input record for function dp_curvedOverall_DP and dp_curvedOverall_MFLOW

This record is used as ** input record ** for the pressure loss function
dp_curvedOverall_DP
and dp_curvedOverall_MFLOW .

Extends from `Modelica.Fluid.Dissipation.Utilities.Records.General.PressureLoss`

(Base record for fluid properties for pressure loss).

Type | Name | Description |
---|---|---|

`DynamicViscosity` | `eta` | Dynamic viscosity of fluid |

`Density` | `rho` | Density of fluid |

Pressure loss of edged bend | calculate pressure loss | overall flow regime | surface roughness

Calculation of pressure loss in edged bends with sharp corners at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness.

There are larger pressure losses in an edged bend compared to a curved bend under the same conditions. The effect of a sharp corner in an edged bend on the pressure loss is much larger than the influence of surface roughness.

Generally this function is numerically best used for the **incompressible case**, where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated. On the other hand the function dp_edgedOverall_MFLOW is numerically best used for the ** compressible case ** if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated.
See more information .

Extends from `Modelica.Icons.Function`

(Icon for functions).

Type | Name | Description |
---|---|---|

`dp_edgedOverall_IN_con` | `IN_con` | Input record for function dp_edgedOverall_DP |

`dp_edgedOverall_IN_var` | `IN_var` | Input record for function dp_edgedOverall_DP |

`MassFlowRate` | `m_flow` | Mass flow rate |

Type | Name | Description |
---|---|---|

`Pressure` | `DP` | Output for function dp_edgedOverall_DP |

Pressure loss of edged bend | calculate mass flow rate | overall flow regime | surface roughness

Calculation of pressure loss in edged bends with sharp corners at overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness.

There are larger pressure losses in an edged bend compared to a curved bend under the same conditions. The effect of a sharp corner in an edged bend on the pressure loss is much larger than the influence of surface roughness.

Generally this function is numerically best used for the ** compressible case ** if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated. On the other hand the function dp_edgedOverall_DP is numerically best used for the ** incompressible case **, where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated.
See more information .

Extends from `Modelica.Icons.Function`

(Icon for functions).

Type | Name | Description |
---|---|---|

`dp_edgedOverall_IN_con` | `IN_con` | Input record for function dp_edgedOverall_MFLOW |

`dp_edgedOverall_IN_var` | `IN_var` | Input record for function dp_edgedOverall_MFLOW |

`Pressure` | `dp` | Pressure loss |

Type | Name | Description |
---|---|---|

`MassFlowRate` | `M_FLOW` | Output for function dp_edgedOverall_MFLOW |

Input record for function dp_edgedOverall_DP and dp_edgedOverall_MFLOW

This record is used as ** input record ** for the pressure loss function
dp_edgedOverall_DP and
dp_edgedOverall_MFLOW .

Extends from `Modelica.Fluid.Dissipation.Utilities.Records.PressureLoss.EdgedBend`

(Input for bend).

Type | Name | Description |
---|---|---|

`Diameter` | `d_hyd` | Hydraulic diameter |

`Angle` | `delta` | Angle of turning |

`Length` | `K` | Roughness (absolute average height of surface asperities) |

Input record for function dp_edgedOverall_DP and dp_edgedOverall_MFLOW

This record is used as ** input record ** for the pressure loss function
dp_edgedOverall_DP and
dp_edgedOverall_MFLOW .

Extends from `Modelica.Fluid.Dissipation.Utilities.Records.General.PressureLoss`

(Base record for fluid properties for pressure loss).

Type | Name | Description |
---|---|---|

`DynamicViscosity` | `eta` | Dynamic viscosity of fluid |

`Density` | `rho` | Density of fluid |