Flow models for 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 |

Curved bend flow model

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) |

Edged bend flow model

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) |