This function provides two similar methods for estimating the
thermal conductivity of polyatomic gases.
The Eucken method (input method == 1) gives good results for low temperatures,
but it tends to give an underestimated value of the thermal conductivity
(lambda) at higher temperatures.
The Modified Eucken method (input method == 2) gives good results for
high-temperatures, but it tends to give an overestimated value of the
thermal conductivity (lambda) at low temperatures.
function thermalConductivityEstimate extends Modelica.Icons.Function; input SpecificHeatCapacity Cp "Constant pressure heat capacity"; input DynamicViscosity eta "Dynamic viscosity"; input Integer method(min = 1, max = 2) = 1 "1: Eucken Method, 2: Modified Eucken Method"; output ThermalConductivity lambda "Thermal conductivity [W/(m.k)]"; end thermalConductivityEstimate;