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8.5.3 Thermal Conductivity Using Kinetic Theory

If you are using the gas law (as described in Section  8.3), you have the option to define the thermal conductivity using kinetic theory as


 k = \frac{15}{4} \;\; \frac{R}{M_w} \mu \left [ \frac{4}{15} \;\; \frac{c_{{p}} M_w}{R} + \frac{1}{3} \right ] (8.5-5)

where $R$ is the universal gas constant, $M_w$ is the molecular weight, $\mu$ is the material's specified or computed viscosity, and $c_p$ is the material's specified or computed specific heat capacity.

To enable the use of this equation for calculating thermal conductivity, select kinetic-theory from the drop-down list to the right of Thermal Conductivity in the Materials panel. The solver will use Equation  8.5-5 to compute the thermal conductivity.


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