WOLFRAM SYSTEM MODELER
    InternalFunctions to calculate mass flow rate from friction pressure drop and vice versa  | 
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         Calculate mass flow rate as function of pressure drop due to friction  | 
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         Calculate pressure drop due to friction as function of mass flow rate  | 
    

SystemModel["Modelica.Fluid.Pipes.BaseClasses.WallFriction.LaminarAndQuadraticTurbulent.Internal"]
