Package for pressure loss calculation of orifices

Calculation of the local pressure loss at a sudden change of the cross sectional areas (sudden expansion or sudden contraction) with sharp corners at turbulent flow regime for incompressible and single-phase fluid flow through arbitrary shaped cross sectional area (square, circular, etc.) considering a smooth surface. See more information.

Calculation of pressure loss in thick edged orifices with sharp corners at overall flow regime for incompressible and single-phase fluid flow through an arbitrary shaped cross sectional area (square, circular, etc.) considering constant influence of surface roughness. See more information.

Extends from `Modelica.Icons.VariantsPackage`

(Icon for package containing variants).

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

`dp_suddenChange_DP` | Pressure loss of orifice with sudden change in cross sectional area | calculate pressure loss | turbulent flow regime | smooth surface | arbitrary cross sectional area | without baffles | sharp edge |

`dp_suddenChange_IN_con` | Input record for function dp_suddenChange_DP and dp_suddenChange_MFLOW |

`dp_suddenChange_IN_var` | Input record for function dp_suddenChange_DP and dp_suddenChange_MFLOW |

`dp_suddenChange_MFLOW` | Pressure loss of orifice with sudden change in cross sectional area | calculate mass flow rate | turbulent flow regime | smooth surface | arbitrary cross sectional area | without baffles | sharp edge |

`dp_thickEdgedOverall_DP` | Pressure loss of thick and sharp edged orifice | calculate pressure loss | overall flow regime | constant influence of friction | arbitrary cross sectional area |

`dp_thickEdgedOverall_IN_con` | Input record for function dp_thickEdgedOverall_DP and dp_thickEdgedOverall_MFLOW |

`dp_thickEdgedOverall_IN_var` | Input record for function dp_thickEdgedOverall_DP and dp_thickEdgedOverall_MFLOW |

`dp_thickEdgedOverall_MFLOW` | Pressure loss of thick and sharp edged orifice | calculate mass flow rate | overall flow regime | constant influence of friction | arbitrary cross sectional area |

Pressure loss of orifice with sudden change in cross sectional area | calculate pressure loss | turbulent flow regime | smooth surface | arbitrary cross sectional area | without baffles | sharp edge

Calculation of the local pressure loss at a sudden change of the cross sectional areas (sudden expansion or sudden contraction) with sharp corners at turbulent flow regime for incompressible and single-phase fluid flow through arbitrary shaped cross sectional area (square, circular, etc.) considering a smooth surface. The flow direction determines the type of the transition. In case of the design flow a sudden expansion will be considered. At flow reversal a sudden contraction will be considered.

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_suddenChange_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_suddenChange_IN_con` | `IN_con` | Input record for function dp_suddenChange_DP |

`dp_suddenChange_IN_var` | `IN_var` | Input record for function dp_suddenChange_DP |

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

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

`Pressure` | `DP` | Output for function dp_suddenChange_DP |

Pressure loss of orifice with sudden change in cross sectional area | calculate mass flow rate | turbulent flow regime | smooth surface | arbitrary cross sectional area | without baffles | sharp edge

Calculation of the local pressure loss at a sudden change of the cross sectional areas (sudden expansion or sudden contraction) with sharp corners at turbulent flow regime for incompressible and single-phase fluid flow through arbitrary shaped cross sectional area (square, circular, etc.) considering a smooth surface. The flow direction determines the type of the transition. In case of the design flow a sudden expansion will be considered. At flow reversal a sudden contraction will be considered.

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_suddenChange_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_suddenChange_IN_con` | `IN_con` | Input record for function dp_suddenChange_MFLOW |

`dp_suddenChange_IN_var` | `IN_var` | Input record for function dp_suddenChange_MFLOW |

`Pressure` | `dp` | Pressure loss |

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

`MassFlowRate` | `M_FLOW` | Output for function dp_suddenChange_MFLOW |

Input record for function dp_suddenChange_DP and dp_suddenChange_MFLOW

This record is used as ** input record ** for the pressure loss functions
dp_suddenChange_DP and
dp_suddenChange_MFLOW.

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

(Input for sudden change of diameter).

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

`Area` | `A_1` | Small cross sectional area of orifice |

`Area` | `A_2` | Large cross sectional area of orifice |

`Length` | `C_1` | Small perimeter of orifice |

`Length` | `C_2` | Large perimeter of orifice |

Input record for function dp_suddenChange_DP and dp_suddenChange_MFLOW

This record is used as ** input record ** for the pressure loss functions
dp_suddenChange_DP and
dp_suddenChange_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 thick and sharp edged orifice | calculate pressure loss | overall flow regime | constant influence of friction | arbitrary cross sectional area

Calculation of pressure loss in thick edged orifices with sharp corners at overall flow regime for incompressible and single-phase fluid flow through an arbitrary shaped cross sectional area (square, circular, etc.) considering constant 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_thickEdgedOverall_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_thickEdgedOverall_IN_con` | `IN_con` | Input record for function dp_thickEdgedOverall_DP |

`dp_thickEdgedOverall_IN_var` | `IN_var` | Input record for function dp_thickEdgedOverall_DP |

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

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

`Pressure` | `DP` | Output for function dp_thickEdgedOverall_DP |

Pressure loss of thick and sharp edged orifice | calculate mass flow rate | overall flow regime | constant influence of friction | arbitrary cross sectional area

Calculation of pressure loss in thick edged orifices with sharp corners at overall flow regime for incompressible and single-phase fluid flow through an arbitrary shaped cross sectional area (square, circular, etc.) considering constant influence of surface roughness.

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

Extends from `Modelica.Icons.Function`

(Icon for functions).

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

`dp_thickEdgedOverall_IN_con` | `IN_con` | Input record for function dp_thickEdgedOverall_MFLOW |

`dp_thickEdgedOverall_IN_var` | `IN_var` | Input record for function dp_thickEdgedOverall_MFLOW |

`Pressure` | `dp` | Pressure loss |

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

`MassFlowRate` | `M_FLOW` | Output for function dp_thickEdgedOverall_MFLOW |

Input record for function dp_thickEdgedOverall_DP and dp_thickEdgedOverall_MFLOW

This record is used as ** input record ** for the pressure loss functions
dp_thickEdgedOverall_DP and
dp_thickEdgedOverall_MFLOW.

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

(Input for orifice).

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

`Area` | `A_0` | Cross sectional area of vena contraction |

`Length` | `C_0` | Perimeter of vena contraction |

`Area` | `A_1` | Large cross sectional area of orifice |

`Length` | `C_1` | Large perimeter of orifice |

`Length` | `L` | Length of vena contraction |

`Pressure` | `dp_smooth` | Start linearisation for decreasing pressure loss |

Input record for function dp_thickEdgedOverall_DP and dp_thickEdgedOverall_MFLOW

This record is used as ** input record ** for the pressure loss functions
dp_thickEdgedOverall_DP and
dp_thickEdgedOverall_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 |