massFlowRate
pressureLoss
Pressure loss functions for generic resistances parameterized with the volume flow rate
This package contains utility functions for the VolumeFlowRate fitting component.
Extends from Modelica.Icons.Package (Icon for standard packages).
| Name | Description |
|---|---|
| massFlowRate
|
Return mass flow rate m_flow as function of pressure loss dp for a curved bend |
| pressureLoss
|
Return pressure loss dp as function of mass flow rate m_flow for a curved bend |
Modelica.Fluid.Fittings.BaseClasses.GenericResistances.VolumeFlowRate.massFlowRateReturn mass flow rate m_flow as function of pressure loss dp for a curved bend
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).
| Name | Description |
|---|---|
| dp | Pressure loss [Pa] |
| a | Coefficient for quadratic term (dp = a*V_flow^2 + b*V_flow) [(Pa.s2)/m6] |
| b | Coefficient for linear term (dp = a*V_flow^2 + b*V_flow) [(Pa.s)/m3] |
| d_a | Density at port_a when fluid is flowing from port_a to port_b [kg/m3] |
| d_b | Density at port_b when fluid is flowing from port_b to port_a [kg/m3] |
| dp_small | Small pressure drop used for regularization if m_flow=f(...,dp_small,..,dp) [Pa] |
| m_flow_small | Small mass flow rate used for regularization if dp=f_inv(...,m_flow_small,m_flow) [kg/s] |
| Name | Description |
|---|---|
| m_flow | Mass flow rate (= port_a.m_flow) [kg/s] |
Modelica.Fluid.Fittings.BaseClasses.GenericResistances.VolumeFlowRate.pressureLossReturn pressure loss dp as function of mass flow rate m_flow for a curved bend
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).
| Name | Description |
|---|---|
| m_flow | Mass flow rate (= port_a.m_flow) [kg/s] |
| a | Coefficient for quadratic term (dp = a*V_flow^2 + b*V_flow) [(Pa.s2)/m6] |
| b | Coefficient for linear term (dp = a*V_flow^2 + b*V_flow) [(Pa.s)/m3] |
| d_a | Density at port_a when fluid is flowing from port_a to port_b [kg/m3] |
| d_b | Density at port_b when fluid is flowing from port_b to port_a [kg/m3] |
| dp_small | Small pressure drop used for regularization if m_flow=f(...,dp_small,..,dp) [Pa] |
| m_flow_small | Small mass flow rate used for regularization if dp=f_inv(...,m_flow_small,m_flow) [kg/s] |
| Name | Description |
|---|---|
| dp | Pressure loss [Pa] |