The Fanning friction factor is computed by Colebrook's equation, assuming turbulent, one-phase flow. For low Reynolds numbers, the limit value for turbulent flow is returned.

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function f_colebrook
  input SI.MassFlowRate w;
  input Real D_A;
  input Real e;
  input SI.DynamicViscosity mu;
  output SI.PerUnit f;
end f_colebrook;

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