WOLFRAM SYSTEM MODELER
pressureLossReturn pressure loss dp as function of mass flow rate m_flow for a curved bend |
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Wolfram Language
In[1]:=
SystemModel["Modelica.Fluid.Fittings.BaseClasses.Bends.EdgedBend.pressureLoss"]
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Information
This information is part of the Modelica Standard Library maintained by the Modelica Association.
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).
Syntax
dp = pressureLoss(m_flow, geometry, d_a, d_b, eta_a, eta_b, dp_small, m_flow_small)
Inputs (8)
| m_flow |
Type: MassFlowRate (kg/s) Description: Mass flow rate (= port_a.m_flow) |
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| geometry |
Type: Geometry Description: Geometry of bend |
| d_a |
Type: Density (kg/m³) Description: Density at port_a when fluid is flowing from port_a to port_b |
| d_b |
Type: Density (kg/m³) Description: Density at port_b when fluid is flowing from port_b to port_a |
| eta_a |
Type: DynamicViscosity (Pa⋅s) Description: Dynamic viscosity at port_a when fluid is flowing from port_a to port_b |
| eta_b |
Type: DynamicViscosity (Pa⋅s) Description: Dynamic viscosity at port_b when fluid is flowing from port_b to port_a |
| dp_small |
Type: AbsolutePressure (Pa) Description: Small pressure drop used for regularization if m_flow=f(...,dp_small,..,dp) |
| m_flow_small |
Type: MassFlowRate (kg/s) Description: Small mass flow rate used for regularization if dp=f_inv(...,m_flow_small,m_flow) |
Outputs (1)
| dp |
Type: Pressure (Pa) Description: Pressure loss |
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