Transport properties of polar gas mixtures SO2+ SO2F2 mixtures

Abstract

The coefficients of viscosity and thermal conductivity of sulphur dioxide, sulphuryl fluoride and binary mixtures of these polar gases have been measured in the temperature range 0-400°C. Viscosity measurements were made using a capillary transpiration method and heat conductivities were determined using a “potential leads” hot-wire apparatus. The rigorous kinetic theory of gas transport properties (using the Stockmayer intermolecular potential) gives good agreement with experiment for both viscosity and heat conductivity, provided that the rotational collision number is treated as a disposable parameter in the latter case. For the gas mixtures, the empirical combining rules for the potential parameters in conjunction with kinetic theory account adequately for the viscosities, and the Hirschfelder-Eucken formula yields results in good agreement with the experimental thermal conductivities provided that the experimental heat conductivities of the pure gases are used. Finally, the coefficients of self-diffusion and interdiffusion are estimated by several different procedures from the experimental viscosity results.