Derivative of viscosity wrt. specific enthalpy at constant pressure in vapor region for given pressure and specific enthalpy
function dmu2hp_Ph input Units.SI.AbsolutePressure p "Pressure"; input Units.SI.SpecificEnthalpy h "Specific enthalpy"; output Real dmuhp "Derivative of viscosity wrt. specific enthalpy at constant pressure"; end dmu2hp_Ph;