Translational and vibrational contributions to the thermal conductivity of molecular gases

General expressions for the translational and vibrational contributions, λTT, λTT, λTT and λTT, to the thermal conductivities of dilute molecular gases are presented. Numerical results are achieved by combining: approximations to deal with inelastic collisions; correlations for the reduced collision integrals Ω(2,2)∗ and Ω(1,1)∗ based on the principle of corresponding states; and experimental data on vibrational relaxation. Illustrative calculations are given for N2 and I2 gases for both equilibrium and non-equilibrium cases. They show that effects of vibratrional-translated non-equilibrium on thermal conductivity may be substantial and important.