Viscosity, Thermal Conductivity, and Diffusion Coefficient of Ar–Ne and Ar–Kr Gaseous Mixtures in the Temperature Range 25–700°C

Abstract

The paper presents new relative measurements of the viscosity of argon, neon, and krypton and of the binary mixtures Ar–Ne and Ar–Kr, all at atmospheric pressure, in the nominal temperature range 25–700°C, and with a precision of ± 0.1%. The oscillating‐disk method was employed. The experimental data were used to calculate the binary diffusion coefficient for the mixtures, and the thermal conductivity of the pure gases as well as the mixtures. The data for the pure gases can be correlated separately with the aid of a suitable potential of the 6‐n family, and optimum values of the parameters $\sigma$ , $\epsilon$ , and $n$ are given for each of them. The same data can be correlated equally well with the aid of a universal, empirical expression for the collision integral with two individual parameters, $s$ and $p$ , being adequate to describe each gas separately. The conventional combination rules as well as those proposed by Kalelkar and Kestin [J. Chem. Phys. 52, 4268 (1970)] have been tested, and it was found that the latter represent the results as well as the expression for mixture viscosity in terms of the viscosity of the pure components and the coefficient of binary diffusion. Wassiljewa coefficients have been evaluated for the representation of the viscosity and the thermal conductivity of the mixtures.