Package Modelica.​Fluid.​Fittings.​BaseClasses.​GenericResistances.​VolumeFlowRate
Pressure loss functions for generic resistances parameterized with the volume flow rate

Information

This package contains utility functions for the VolumeFlowRate fitting component.

Extends from Modelica.​Icons.​Package (Icon for standard packages).

Package Contents

NameDescription
massFlowRateReturn mass flow rate m_flow as function of pressure loss dp for a curved bend
pressureLossReturn pressure loss dp as function of mass flow rate m_flow for a curved bend

Function Modelica.​Fluid.​Fittings.​BaseClasses.​GenericResistances.​VolumeFlowRate.​massFlowRate
Return mass flow rate m_flow as function of pressure loss dp for a curved bend

Information

This function returns the mass flow rate m_flow as function of pressure loss dp for an edged bend. The details of the function are described here.

The bend characteristic is valid for constant density and constant dynamic viscosity. It can be approximately also used for compressible media. This is performed by providing the upstream density and upstream dynamic viscosity. In order to be able to regularize density and dynamic viscosity around zero mass flow rate, the two quantities have to be given if fluid flows from port_a to port_b (d_a, eta_a) and if fluid flows from port_b to port_a (d_b, eta_b).

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

Inputs

TypeNameDescription
PressuredpPressure loss
RealaCoefficient for quadratic term (dp = a*V_flow^2 + b*V_flow)
RealbCoefficient for linear term (dp = a*V_flow^2 + b*V_flow)
Densityd_aDensity at port_a when fluid is flowing from port_a to port_b
Densityd_bDensity at port_b when fluid is flowing from port_b to port_a
AbsolutePressuredp_smallSmall pressure drop used for regularization if m_flow=f(...,dp_small,..,dp)
MassFlowRatem_flow_smallSmall mass flow rate used for regularization if dp=f_inv(...,m_flow_small,m_flow)

Outputs

TypeNameDescription
MassFlowRatem_flowMass flow rate (= port_a.m_flow)

Function Modelica.​Fluid.​Fittings.​BaseClasses.​GenericResistances.​VolumeFlowRate.​pressureLoss
Return pressure loss dp as function of mass flow rate m_flow for a curved bend

Information

This function returns the pressure loss dp as function of mass flow rate m_flow for an edged bend. The details of the function are described here.

The bend characteristic is valid for constant density and constant dynamic viscosity. It can be approximately also used for compressible media. This is performed by providing the upstream density and upstream dynamic viscosity. In order to be able to regularize density and dynamic viscosity around zero mass flow rate, the two quantities have to be given if fluid flows from port_a to port_b (d_a, eta_a) and if fluid flows from port_b to port_a (d_b, eta_b).

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

Inputs

TypeNameDescription
MassFlowRatem_flowMass flow rate (= port_a.m_flow)
RealaCoefficient for quadratic term (dp = a*V_flow^2 + b*V_flow)
RealbCoefficient for linear term (dp = a*V_flow^2 + b*V_flow)
Densityd_aDensity at port_a when fluid is flowing from port_a to port_b
Densityd_bDensity at port_b when fluid is flowing from port_b to port_a
AbsolutePressuredp_smallSmall pressure drop used for regularization if m_flow=f(...,dp_small,..,dp)
MassFlowRatem_flow_smallSmall mass flow rate used for regularization if dp=f_inv(...,m_flow_small,m_flow)

Outputs

TypeNameDescription
PressuredpPressure loss

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