Transport properties of the binary gas mixtures containing CO₂, N₂, SF₆, and CF₄ at low density

The transport properties at low density are investigated in the framework of the kinetic theory of gases for five binary mixtures composed of CO₂, N₂, SF₆, and CF₄, which are of great interest to the electric power industry and are not available in the literature. The Lennard-Jones (12-6) potentials recommended in the literature are used to model the interactions between like molecules, and the Lorentz-Berthelot combining rules are employed to further describe the unlike interactions. The viscosity, binary diffusion coefficient, and thermal diffusion factor are computed for CO₂-SF₆, CO₂-CF₄, N₂-SF₆, N₂-CF₄, and SF₆-CF₄. The experimental data are available for the viscosity and diffusion coefficient of the studied systems over a much limited temperature range, and reasonable agreement is found between the experimental data and our calculated values. The new transport property values of the five binary mixtures are tabulated in the, covering a very wide temperature range from 300 to 30 000 K.