Prediction of thermal conductivities of oxygen, nitrogen and carbon dioxide at the moderate density regime via semi-empirical assessment

Abstract

Thermal conductivities coefficients for gaseous state of N₂, O₂ and CO₂ at zero density are determined by the inversion technique. The Lennard-Jones 12-6 (LJ 12-6) potential energy function is used as the initial model potential required by the technique. The Wang Chang-Uhlenbeck-de Boer (WCUB) approach of the kinetic theory of gases has been used for calculating the contribution of molecular degree of freedom to the thermal conductivity of N₂, O₂ and CO₂. Also, the initial density dependence of gaseous thermal conductivity according to the Rainwater-Friend theory, which was given by Najafi et al., has been considered for N₂, O₂ and CO₂.