functionlaminarTurbulentPressureLoss
Pressure loss function (Cheng 2008) for laminar, transient and turbulent flow regimes
Extends from Internal.FlowResistance.partialPressureLoss (Partial pressure loss function).
Information
Pressure loss according to Darcy–Weisbach, for laminar, transient and turbulent flow.
In order to avoid a 0^0 for Re=0 (and therefore a = 1) in the computation of lambda_aux, we add epsilon=0.01 to Re to lower bound it in a smooth way.
ks_input defines the pipe roughness. It can be selected from a list of materials or given directly.
Cheng, Nian-Sheng (2008). Formulas for friction factor in transitional regimes. In:Journal of Hydraulic Engineering134.9, pp. 1357-1362
Elmqvist, Hilding, Hubertus Tummescheit, and Martin Otter (2003). Object-orientedmodeling of thermo-fluid systems. In:3rd International Modelica Conference,pp. 269-286.
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| SI.MassFlowRate | m_flow (from partialPressureLoss) | Mass flow rate | |
| SI.Density | rho (from partialPressureLoss) | Density | |
| SI.DynamicViscosity | mu (from partialPressureLoss) | Dynamic viscosity | |
| SI.Length | r (from partialPressureLoss) | Radius | |
| SI.Length | l (from partialPressureLoss) | Length | |
| SI.Length | ks_input | 1e-7 | Surface roughness |
| ThermofluidStream.Processes.Internal.Material | material | ThermofluidStream.Processes.Internal.Material.other | Material of pipe |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| SI.PressureDifference | pressureLoss (from partialPressureLoss) | pressure loss (dp) |