Package Modelica.​Fluid.​Fittings.​Bends
Flow models for bends

Information

This icon shall be used for a package/library that contains several variants of one component.

Extends from Modelica.​Icons.​VariantsPackage (Icon for package containing variants).

Package Contents

NameDescription
CurvedBendCurved bend flow model
EdgedBendEdged bend flow model

Model Modelica.​Fluid.​Fittings.​Bends.​CurvedBend
Curved bend flow model

Information

This component models a curved bend in the overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness. It is expected that also compressible fluid flow can be handled up to about Ma = 0.3. It is assumed that neither mass nor energy is stored in this component. In the model basically a function is called to compute the mass flow rate as a function of pressure loss for a curved bend. Also the inverse of this function is defined, and a tool might use this inverse function instead, in order to avoid the solution of a nonlinear equation.

The details of the model are described in the documentation of the underlying function.

Extends from Modelica.​Fluid.​Dissipation.​Utilities.​Icons.​PressureLoss.​Bend_i (Icon for bend) and Modelica.​Fluid.​Interfaces.​PartialPressureLoss (Base flow model for pressure loss functions with the same area at port_a and at port_b).

Parameters

TypeNameDefaultDescription
BooleanallowFlowReversalsystem.​allowFlowReversal= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
AbsolutePressuredp_start0.01 * system.p_startGuess value of dp = port_a.p - port_b.p
MassFlowRatem_flow_startsystem.​m_flow_startGuess value of m_flow = port_a.m_flow
MassFlowRatem_flow_smallif system.use_eps_Re then system.eps_m_flow * system.m_flow_nominal else system.m_flow_smallSmall mass flow rate for regularization of zero flow
Booleanshow_Ttrue= true, if temperatures at port_a and port_b are computed
Booleanshow_V_flowtrue= true, if volume flow rate at inflowing port is computed
Geometrygeometry Geometry of curved bend

Connectors

TypeNameDescription
FluidPort_aport_aFluid connector a (positive design flow direction is from port_a to port_b)
FluidPort_bport_bFluid connector b (positive design flow direction is from port_a to port_b)

Model Modelica.​Fluid.​Fittings.​Bends.​EdgedBend
Edged bend flow model

Information

This component models an edged bend in the overall flow regime for incompressible and single-phase fluid flow through circular cross sectional area considering surface roughness. It is expected that also compressible fluid flow can be handled up to about Ma = 0.3. It is assumed that neither mass nor energy is stored in this component. In the model basically a function is called to compute the mass flow rate as a function of pressure loss for an edged bend. Also the inverse of this function is defined, and a tool might use this inverse function instead, in order to avoid the solution of a nonlinear equation.

The details of the model are described in the documentation of the underlying function.

Extends from Modelica.​Fluid.​Dissipation.​Utilities.​Icons.​PressureLoss.​Bend_i (Icon for bend) and Modelica.​Fluid.​Interfaces.​PartialPressureLoss (Base flow model for pressure loss functions with the same area at port_a and at port_b).

Parameters

TypeNameDefaultDescription
BooleanallowFlowReversalsystem.​allowFlowReversal= true to allow flow reversal, false restricts to design direction (port_a -> port_b)
AbsolutePressuredp_start0.01 * system.p_startGuess value of dp = port_a.p - port_b.p
MassFlowRatem_flow_startsystem.​m_flow_startGuess value of m_flow = port_a.m_flow
MassFlowRatem_flow_smallif system.use_eps_Re then system.eps_m_flow * system.m_flow_nominal else system.m_flow_smallSmall mass flow rate for regularization of zero flow
Booleanshow_Ttrue= true, if temperatures at port_a and port_b are computed
Booleanshow_V_flowtrue= true, if volume flow rate at inflowing port is computed
Geometrygeometry Geometry of curved bend

Connectors

TypeNameDescription
FluidPort_aport_aFluid connector a (positive design flow direction is from port_a to port_b)
FluidPort_bport_bFluid connector b (positive design flow direction is from port_a to port_b)

Generated 2018-12-12 12:13:26 EST by MapleSim.