function derDynamicViscosity_derT_derrho
input Units.SI.Density rho "Density";
input Units.SI.Temperature T "Temperature";
input Integer fluid "<html>Fluid number: <br>1 - Water/Steam <br>2 - C3H3F5 <br>3 - FlueGases <br>4 - MoltenSalt <br>5 - Oil <br>6 - DryAirIdealGas <br>7 - WaterSteamSimple </html>";
input Integer mode "IF97 region - 0:automatic computation";
input Real Xco2 "CO2 mass fraction";
input Real Xh2o "H2O mass fraction";
input Real Xo2 "O2 mass fraction";
input Real Xso2 "SO2 mass fraction";
input Real der_rho "Density time derivative";
input Real der_T "Temperature time derivative";
input Real der_Xco2 = 0 "CO2 mass fraction";
input Real der_Xh2o = 0 "H2O mass fraction";
input Real der_Xo2 = 0 "O2 mass fraction";
input Real der_Xso2 = 0 "SO2 mass fraction";
output Real der_mu "Dynamic Viscosity time derivative";
end derDynamicViscosity_derT_derrho;
.ThermoSysPro.Properties.Fluid.derDynamicViscosity_derT_derrho