.ThermofluidStream.Processes.Internal.FlowResistance.laminarTurbulentPressureLossHaaland

Information

Pressure loss after Darcy–Weisbach, which is valid in laminar and turbulent flow regimes.

The friction factor is based on Haaland 1983.

Haaland, S. E. Simple and Explicit Formulas for the Friction Factor in Turbulent Pipe Flow. Journal of Fluids Engineering 105, 89-90; 10.1115/1.3240948 (1983).

Interface

function laminarTurbulentPressureLossHaaland
  extends Internal.FlowResistance.partialPressureLoss;
  import Modelica.Constants.pi;
  input SI.ReynoldsNumber Re_laminar = 2000 "Upper Reynolds number boundary for laminar flow in pipe" annotation(
    Dialog(enable = true));
  input SI.ReynoldsNumber Re_turbulent = 4000 "Lower Reynolds number boundary for turbulent flow in pipe" annotation(
    Dialog(enable = true));
  input Real shape_factor(unit = "1") = 64 "Laminar pressure loss factor based on Hagen-Poiseuille loss" annotation(
    Dialog(enable = true));
  input Real n(unit = "1") = 1 "Transition coefficient (see documentation)" annotation(
    Dialog(enable = true));
  input SI.Length ks_input(min = 1e-7) = 1e-7 "Pipe roughness" annotation(
    Dialog(enable = (material == ThermofluidStream.Processes.Internal.Material.other)));
  input ThermofluidStream.Processes.Internal.Material material = ThermofluidStream.Processes.Internal.Material.other "Material of pipe" annotation(
    Dialog(enable = true));
end laminarTurbulentPressureLossHaaland;