No abstract

A modified methodology for calculating thermophysical properties of binary helium He based mixtures with a heavier gas component is presented. To obtain the properties of the pure components and mixtures in the limit of zero density, the most recent ab initio calculation results and modified mixing rules are implemented. To calculate the properties at high pressures, the extended laws of corresponding states are used. A verification procedure was carried out, and the results are presented for deviations of calculated thermal conductivity λ and dynamic viscosity μ values from available experimental data for mixtures He-Ar and He-N2 at temperatures from 183 K up to 603 K, and pressures up to 10 MPa. It is shown that in the considered range of thermodynamic parameters the deviations of the calculation results from the experimental values are less than 3 % for λ and less than 2 % for μ.