WOLFRAM SYSTEM MODELER
PartialTwoPortTransportPartial element transporting fluid between two ports without storage of mass or energy |
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Wolfram Language
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SystemModel["Modelica.Fluid.Interfaces.PartialTwoPortTransport"]
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Information
This information is part of the Modelica Standard Library maintained by the Modelica Association.
This component transports fluid between its two ports, without storing mass or energy.
Energy may be exchanged with the environment though, e.g., in the form of work.
PartialTwoPortTransport is intended as base class for devices like orifices, valves and simple fluid machines.
Three equations need to be added by an extending class using this component:
- the momentum balance specifying the relationship between the pressure drop
dpand the mass flow ratem_flow, port_b.h_outflowfor flow in design direction, andport_a.h_outflowfor flow in reverse direction.
Moreover appropriate values shall be assigned to the following parameters:
dp_startfor a guess of the pressure dropm_flow_smallfor regularization of zero flow.
Parameters (6)
| allowFlowReversal |
Value: system.allowFlowReversal Type: Boolean Description: = true to allow flow reversal, false restricts to design direction (port_a -> port_b) |
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| dp_start |
Value: 0.01 * system.p_start Type: AbsolutePressure (Pa) Description: Guess value of dp = port_a.p - port_b.p |
| m_flow_start |
Value: system.m_flow_start Type: MassFlowRate (kg/s) Description: Guess value of m_flow = port_a.m_flow |
| m_flow_small |
Value: if system.use_eps_Re then system.eps_m_flow * system.m_flow_nominal else system.m_flow_small Type: MassFlowRate (kg/s) Description: Small mass flow rate for regularization of zero flow |
| show_T |
Value: true Type: Boolean Description: = true, if temperatures at port_a and port_b are computed |
| show_V_flow |
Value: true Type: Boolean Description: = true, if volume flow rate at inflowing port is computed |
Connectors (2)
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port_a |
Type: FluidPort_a Description: Fluid connector a (positive design flow direction is from port_a to port_b) |
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port_b |
Type: FluidPort_b Description: Fluid connector b (positive design flow direction is from port_a to port_b) |
Components (3)
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system |
Type: System Description: System wide properties |
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state_a |
Type: ThermodynamicState Description: State for medium inflowing through port_a |
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state_b |
Type: ThermodynamicState Description: State for medium inflowing through port_b |
Extended by (9)
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Modelica.Fluid.Interfaces Base flow model for pressure loss functions with the same area at port_a and at port_b |
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BaseModelNonconstantCrossSectionArea Modelica.Fluid.Fittings.BaseClasses.QuadraticTurbulent Generic pressure drop component with constant turbulent loss factor data and without an icon, for non-constant cross section area |
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Modelica.Fluid.Fittings.BaseClasses.QuadraticTurbulent Generic pressure drop component with constant turbulent loss factor data and without an icon |
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Modelica.Fluid.Fittings Simple generic orifice defined by pressure loss coefficient and diameter (only for flow from port_a to port_b) |
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Modelica.Fluid.Fittings.GenericResistances Flow model for generic resistance parameterized with the volume flow rate |
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Modelica.Fluid.Valves.BaseClasses Base model for valves |
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Modelica.Fluid.Valves Valve for water/steam flows with discrete opening signal and ramp opening |
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Modelica.Fluid.Valves Valve for water/steam flows with linear pressure drop |
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Modelica.Fluid.Valves Valve for water/steam flows with linear pressure drop |