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
massFlowRate	Return mass flow rate m_flow as function of pressure loss dp for a thick edged orifice
pressureLoss	Return pressure loss dp as function of mass flow rate m_flow for a thick edged orifice
Geometry	Geometric data for a thick edged orifice
Choices	Choices for Geometry

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

Name	Description
dp	Pressure loss [Pa]
geometry	Geometry of bend
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]
eta_a	Dynamic viscosity at port_a when fluid is flowing from port_a to port_b [Pa.s]
eta_b	Dynamic viscosity at port_b when fluid is flowing from port_b to port_a [Pa.s]
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]

Outputs

Name	Description
m_flow	Mass flow rate (= port_a.m_flow) [kg/s]

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.

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

Inputs

Name	Description
m_flow	Mass flow rate (= port_a.m_flow) [kg/s]
geometry	Geometry of bend
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]
eta_a	Dynamic viscosity at port_a when fluid is flowing from port_a to port_b [Pa.s]
eta_b	Dynamic viscosity at port_b when fluid is flowing from port_b to port_a [Pa.s]
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]

Outputs

Name	Description
dp	Pressure loss [Pa]

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

Name	Description
crossArea	Inner cross sectional area [m2]
perimeter	Inner perimeter [m]
venaCrossArea	Cross sectional area of vena contraction [m2]
venaPerimeter	Perimeter of vena contraction [m]
venaLength	Length of vena contraction [m]

Automatically generated Thu Dec 19 17:20:11 2019.