Thermal conductivity of polyatomic dilute gas mixtures

Recently developed expressions for predicting thermal conductivity of nonpolar multicomponent molecular mixtures in a dilute-gas limit have been tested against the available experimental data. For most mixtures studied the deviations from the experimental thermal conductivity data are within +/-2.5%. This is remarkably good agreement, considering the approximations made in deriving the prediction scheme from kinetic theory results. The agreement achieved indicates that the proposed scheme, which requires only the thermal conductivity and isobaric heat capacity of pure species and a set of interaction parameters that are readily available, can form the basis of an accurate engineering estimation technique for thermal conductivity of gaseous mixtures at low pressure.