Thermal conductivity Stiel-Thodos method

Gases Methods for estimating low-pressure gas thermal conductivities are based on kinetic theory and generally correlate the dimensionless group kM/r C (M = molecular weight, T] = viscosity, C = isochoric heat capacity) known as the Eucken factor. The method of Stiel and Thodos is recommended for pure nonpolar compounds, and the method of Chung is recommended for pure polar compounds. 

The correction for the pressure dependence of transport properties of gases can be piade by use of various correlations. These include the gas density which in turn is calculated from the compressibility factor. For viscosity the method proposed by Dean, Stiel [9] can be used, and for the thermal conductivity the method proposed by Stiel, Thodos [54] can be used. For the bulk diffusion coefficient it is normally assumed that it is inversely proportional to the density. 

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