Package Modelica.Fluid.Fittings.BendsFlow models for bends
Package Modelica.Fluid.Fittings.Bends
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).
| Name | Description |
|---|---|
CurvedBend | Curved bend flow model |
EdgedBend | Edged bend flow model |
Model Modelica.Fluid.Fittings.Bends.CurvedBend
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).
| Type | Name | Default | Description |
|---|---|---|---|
Boolean | allowFlowReversal | system.allowFlowReversal | = true to allow flow reversal, false restricts to design direction (port_a -> port_b) |
AbsolutePressure | dp_start | 0.01 * system.p_start | Guess value of dp = port_a.p - port_b.p |
MassFlowRate | m_flow_start | system.m_flow_start | Guess value of m_flow = port_a.m_flow |
MassFlowRate | m_flow_small | if system.use_eps_Re then system.eps_m_flow * system.m_flow_nominal else system.m_flow_small | Small mass flow rate for regularization of zero flow |
Boolean | show_T | true | = true, if temperatures at port_a and port_b are computed |
Boolean | show_V_flow | true | = true, if volume flow rate at inflowing port is computed |
Geometry | geometry | Geometry of curved bend |
| Type | Name | Description |
|---|---|---|
FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |
Model Modelica.Fluid.Fittings.Bends.EdgedBend
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).
| Type | Name | Default | Description |
|---|---|---|---|
Boolean | allowFlowReversal | system.allowFlowReversal | = true to allow flow reversal, false restricts to design direction (port_a -> port_b) |
AbsolutePressure | dp_start | 0.01 * system.p_start | Guess value of dp = port_a.p - port_b.p |
MassFlowRate | m_flow_start | system.m_flow_start | Guess value of m_flow = port_a.m_flow |
MassFlowRate | m_flow_small | if system.use_eps_Re then system.eps_m_flow * system.m_flow_nominal else system.m_flow_small | Small mass flow rate for regularization of zero flow |
Boolean | show_T | true | = true, if temperatures at port_a and port_b are computed |
Boolean | show_V_flow | true | = true, if volume flow rate at inflowing port is computed |
Geometry | geometry | Geometry of curved bend |
| Type | Name | Description |
|---|---|---|
FluidPort_a | port_a | Fluid connector a (positive design flow direction is from port_a to port_b) |
FluidPort_b | port_b | Fluid connector b (positive design flow direction is from port_a to port_b) |