Modelica.Fluid.Dissipation.PressureLoss.Orifice

Package for pressure loss calculation of orifices

Information

Orifice

Sudden change

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.

Thick edged orifice

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).

Package Content

Name Description
Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_DP 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
Modelica.Fluid.Dissipation.PressureLoss.Orifice.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
Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_con dp_suddenChange_IN_con Input record for function dp_suddenChange_DP and dp_suddenChange_MFLOW
Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_var dp_suddenChange_IN_var Input record for function dp_suddenChange_DP and dp_suddenChange_MFLOW
Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_DP 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
Modelica.Fluid.Dissipation.PressureLoss.Orifice.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
Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_IN_con dp_thickEdgedOverall_IN_con Input record for function dp_thickEdgedOverall_DP and dp_thickEdgedOverall_MFLOW
Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_IN_var dp_thickEdgedOverall_IN_var Input record for function dp_thickEdgedOverall_DP and dp_thickEdgedOverall_MFLOW

Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_DP Modelica.Fluid.Dissipation.PressureLoss.Orifice.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

Information

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).

Inputs

NameDescription
Constant inputs
IN_conInput record for function dp_suddenChange_DP
Variable inputs
IN_varInput record for function dp_suddenChange_DP
Input
m_flowMass flow rate [kg/s]

Outputs

NameDescription
DPOutput for function dp_suddenChange_DP [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_MFLOW Modelica.Fluid.Dissipation.PressureLoss.Orifice.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

Information

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).

Inputs

NameDescription
Constant inputs
IN_conInput record for function dp_suddenChange_MFLOW
Variable inputs
IN_varInput record for function dp_suddenChange_MFLOW
Input
dpPressure loss [Pa]

Outputs

NameDescription
M_FLOWOutput for function dp_suddenChange_MFLOW [kg/s]

Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_con Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_con

Input record for function dp_suddenChange_DP and dp_suddenChange_MFLOW

Information

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).

Parameters

NameDescription
Orifice
A_1Small cross sectional area of orifice [m2]
A_2Large cross sectional area of orifice [m2]
C_1Small perimeter of orifice [m]
C_2Large perimeter of orifice [m]

Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_var Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_var

Input record for function dp_suddenChange_DP and dp_suddenChange_MFLOW

Information

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).

Parameters

NameDescription
Fluid properties
etaDynamic viscosity of fluid [Pa.s]
rhoDensity of fluid [kg/m3]

Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_DP Modelica.Fluid.Dissipation.PressureLoss.Orifice.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

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.

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).

Inputs

NameDescription
Constant inputs
IN_conInput record for function dp_thickEdgedOverall_DP
Variable inputs
IN_varInput record for function dp_thickEdgedOverall_DP
Input
m_flowMass flow rate [kg/s]

Outputs

NameDescription
DPOutput for function dp_thickEdgedOverall_DP [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_MFLOW Modelica.Fluid.Dissipation.PressureLoss.Orifice.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

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.

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).

Inputs

NameDescription
Constant inputs
IN_conInput record for function dp_thickEdgedOverall_MFLOW
Variable inputs
IN_varInput record for function dp_thickEdgedOverall_MFLOW
Input
dpPressure loss [Pa]

Outputs

NameDescription
M_FLOWOutput for function dp_thickEdgedOverall_MFLOW [kg/s]

Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_IN_con Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_IN_con

Input record for function dp_thickEdgedOverall_DP and dp_thickEdgedOverall_MFLOW

Information

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).

Parameters

NameDescription
Orifice
A_0Cross sectional area of vena contraction [m2]
C_0Perimeter of vena contraction [m]
A_1Large cross sectional area of orifice [m2]
C_1Large perimeter of orifice [m]
LLength of vena contraction [m]
Linearisation
dp_smoothStart linearisation for decreasing pressure loss [Pa]

Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_IN_var Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_thickEdgedOverall_IN_var

Input record for function dp_thickEdgedOverall_DP and dp_thickEdgedOverall_MFLOW

Information

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).

Parameters

NameDescription
Fluid properties
etaDynamic viscosity of fluid [Pa.s]
rhoDensity of fluid [kg/m3]
Automatically generated Thu Oct 1 16:07:59 2020.