This information is part of the Modelica Standard Library maintained by the Modelica Association.

This function applies the Masson and Saxena modification of the Wassiljewa Equation for the thermal conductivity for gas mixtures of n elements at low pressure.

For nonpolar gas mixtures errors will generally be less than 3 to 4%. For mixtures of nonpolar-polar and polar-polar gases, errors greater than 5 to 8% may be expected. For mixtures in which the sizes and polarities of the constituent molecules are not greatly different, the thermal conductivity can be estimated satisfactorily by a mole fraction average of the pure component conductivities.

lambdam = lowPressureThermalConductivity(y, T, Tc, Pc, M, lambda)

y	Type: MoleFraction[:] (mol/mol) Description: Mole fraction of the components in the gas mixture
T	Type: Temperature (K) Description: Temperature
Tc	Type: Temperature[size(y, 1)] (K) Description: Critical temperatures
Pc	Type: AbsolutePressure[size(y, 1)] (Pa) Description: Critical pressures
M	Type: MolarMass[size(y, 1)] (kg/mol) Description: Molecular weights
lambda	Type: ThermalConductivity[size(y, 1)] (W/(m·K)) Description: Thermal conductivities of the pure gases

lambdam	Type: ThermalConductivity (W/(m·K)) Description: Thermal conductivity of the gas mixture