Package Modelica.Fluid.Dissipation.PressureLoss.OrificePackage for pressure loss calculation of orifices
Package Modelica.Fluid.Dissipation.PressureLoss.Orifice
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 |
Function Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_DP
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 |
Function Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_MFLOW
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 |
Record Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_conThis 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 |
Record Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_varThis 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 |
Function Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_DP
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 |
Function Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_MFLOW
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 |
Record Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_IN_conThis 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 |
Record Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_IN_varThis 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 |