.ThermofluidStream.Processes.Pipes.BaseClasses.WallFriction.Utilities.DarcyFriction

Information

Function calculating Darcy friction factor lambda as f(m_flow, D_h, Delta, rho, mu, Re1, Re2), where:

• m_flow: mass flow rate [kg/s]
• D_h: hydraulic diameter [m]
• Delta: relative roughness [m/m]
• rho: density [kg/m^3]
• mu: dynamic viscosity [Pa.s]
• Re1: lower Reynolds Number boundary for laminar-turbulent transition flow regime [-]
• Re2: upper Reynolds Number boundary for laminar-turbulent transition flow regime [-]

The function is extracted from dp_fric_of_m_flow.

[P. Jordan; HTWG Konstanz; 01/24]

Interface

function DarcyFriction
  extends Modelica.Icons.Function;
  input Modelica.Units.SI.MassFlowRate m_flow "Mass flow rate";
  input Modelica.Units.SI.Length D_h "Hydraulic diameter";
  input Modelica.Units.SI.Length Delta(min = 0) "Relaitiv roughness";
  input Modelica.Units.SI.Density rho "Inlet density";
  input Modelica.Units.SI.DynamicViscosity mu "Dynamic viscosity";
  input Real Re1 "Lower boundary Re for laminar-turbulent transition regime";
  input Real Re2 "Upper boundary Re for laminar-turbulent transition regime";
  output Internal.Types.DarcyFrictionFactor lambda "Darcy friction factor";
end DarcyFriction;