Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice

Pressure loss functions for thick edged orifices

Information

This package contains utility functions and records for the ThickEdgedOrifice fitting component.

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

Package Content

Name Description
Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.massFlowRate massFlowRate Return mass flow rate m_flow as function of pressure loss dp for a thick edged orifice
Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.pressureLoss pressureLoss Return pressure loss dp as function of mass flow rate m_flow for a thick edged orifice
Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.Geometry Geometry Geometric data for a thick edged orifice
Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.Choices Choices Choices for Geometry

Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.massFlowRate Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.massFlowRate

Return mass flow rate m_flow as function of pressure loss dp for a thick edged orifice

Information

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

The orifice 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

NameDescription
dpPressure loss [Pa]
geometryGeometry of bend
d_aDensity at port_a when fluid is flowing from port_a to port_b [kg/m3]
d_bDensity at port_b when fluid is flowing from port_b to port_a [kg/m3]
eta_aDynamic viscosity at port_a when fluid is flowing from port_a to port_b [Pa.s]
eta_bDynamic viscosity at port_b when fluid is flowing from port_b to port_a [Pa.s]
dp_smallSmall pressure drop used for regularization if m_flow=f(...,dp_small,..,dp) [Pa]
m_flow_smallSmall mass flow rate used for regularization if dp=f_inv(...,m_flow_small,m_flow) [kg/s]

Outputs

NameDescription
m_flowMass flow rate (= port_a.m_flow) [kg/s]

Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.pressureLoss Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.pressureLoss

Return pressure loss dp as function of mass flow rate m_flow for a thick edged orifice

Information

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

The orifice 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

NameDescription
m_flowMass flow rate (= port_a.m_flow) [kg/s]
geometryGeometry of bend
d_aDensity at port_a when fluid is flowing from port_a to port_b [kg/m3]
d_bDensity at port_b when fluid is flowing from port_b to port_a [kg/m3]
eta_aDynamic viscosity at port_a when fluid is flowing from port_a to port_b [Pa.s]
eta_bDynamic viscosity at port_b when fluid is flowing from port_b to port_a [Pa.s]
dp_smallSmall pressure drop used for regularization if m_flow=f(...,dp_small,..,dp) [Pa]
m_flow_smallSmall mass flow rate used for regularization if dp=f_inv(...,m_flow_small,m_flow) [kg/s]

Outputs

NameDescription
dpPressure loss [Pa]

Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.Geometry Modelica.Fluid.Fittings.BaseClasses.Orifices.ThickEdgedOrifice.Geometry

Geometric data for a thick edged orifice

Information

This record is used to define the geometric (constant) data of a thick edged orifice. The details of the record are described here.

Extends from Modelica.Icons.Record (Icon for records).

Parameters

NameDescription
crossAreaInner cross sectional area [m2]
perimeterInner perimeter [m]
venaCrossAreaCross sectional area of vena contraction [m2]
venaPerimeterPerimeter of vena contraction [m]
venaLengthLength of vena contraction [m]
Automatically generated Thu Dec 19 17:20:11 2019.