.Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_MFLOW

Information

Calculation of the local pressure loss at a sudden change of the cross sectional areas (sudden expansion or sudden contraction) with sharp corners at turbulent flow regime for incompressible and single-phase fluid flow through arbitrary shaped cross sectional area (square, circular, etc.) considering a smooth surface. The flow direction determines the type of the transition. In case of the design flow a sudden expansion will be considered. At flow reversal a sudden contraction will be considered.

Generally this function is numerically best used for the compressible case if the pressure loss (dp) is known (out of pressures as state variable) and the mass flow rate (M_FLOW) has to be calculated. On the other hand the function dp_suddenChange_DP is numerically best used for the incompressible case, where the mass flow rate (m_flow) is known (as state variable) in the used model and the corresponding pressure loss (DP) has to be calculated. See more information.

Interface

function dp_suddenChange_MFLOW
  extends Modelica.Icons.Function;
  import FD = Modelica.Fluid.Dissipation.PressureLoss.Orifice;
  import SMOOTH = Modelica.Fluid.Dissipation.Utilities.Functions.General.Stepsmoother;
  input Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_con IN_con "Input record for function dp_suddenChange_MFLOW" annotation(
    Dialog(group = "Constant inputs"));
  input Modelica.Fluid.Dissipation.PressureLoss.Orifice.dp_suddenChange_IN_var IN_var "Input record for function dp_suddenChange_MFLOW" annotation(
    Dialog(group = "Variable inputs"));
  input SI.Pressure dp "Pressure loss" annotation(
    Dialog(group = "Input"));
  output SI.MassFlowRate M_FLOW "Output for function dp_suddenChange_MFLOW";
end dp_suddenChange_MFLOW;