Thermal conductivity of gas mixtures

Thermal conductivities of ten gases and selected binary and ternary mixtures of them were measured in a concentric silver cylinder cell over the temperature range from 100° to 540°C. The gases were helium, argon, nitrogen, oxygen, carbon dioxide, methyl ether, and methyl formate. Correlations based upon empirical equations derived from kinetic theory have been developed for the thermal conductivity of gas mixtures. For mixtures of polyatomic molecules the energy transport is considered in two parts, that is one portion transferred by collision and the other by diffusion. When compared with the experimental data for 226 binary mixtures over temperatures from 0° to 774°C., the conductivity equation proposed in this work shows an average deviation of 2.1%.