.ThermofluidStream.Processes.Internal.FlowResistance.zetaPressureLoss

Information

For specific components (armatures, fittings, pipe sections, grids, ...), the pressure loss coefficient is often given in the data sheet.

Together with a given (or calculated) reference area A, the pressure drop can be calculated:

dp := zeta * rho/2 * v^2 = zeta/(2*rho) * m_flow^2/A^2

The square of the mass-flow is regularized using the Modelica.Fluid.Utilities.regSquare function.

Interface

function zetaPressureLoss
  extends Internal.FlowResistance.partialPressureLoss;
  input Real zeta(unit = "1") "Pressure loss coefficient (dp = zeta*rho/2*v^2)" annotation(
    Dialog(enable = true));
  input Boolean fromGeometry = true "= true, if cross-sectional area if calculated from geometry" annotation(
    Dialog(enable = true, group = "Cross-sectional area"),
    Evaluate = true,
    HideResult = true,
    choices(checkBox = true));
  input SI.Area A = Modelica.Constants.pi*r*r "Cross-sectional area" annotation(
    Dialog(group = "Cross-sectional area", enable = not fromGeometry));
end zetaPressureLoss;