Thermal diffusion in rarefield ternary gas systems
The questions of experimental and theoretical study of thermal diffusion in rarefied ternary gas systems are discussed. A review of the experimental studies of thermal diffusion in ternary gas systems is given. A semi-empirical method of calculating the thermal diffusion factor (TDF) values for ternary gas mixtures using corresponding TDF values for binary mixtures is proposed. TDF values for binary gas mixtures were calculated with a help of the previously proposed formula based on the experimental data of the thermal diffusion. Corresponding coefficients values for 21 binary gas systems are given. These coefficients allow us to calculate TDFs values for binary systems in a wide range of concentrations and temperatures. The calculation of TDFs in ternary gas systems through TDFs for binary systems is carried out. Binary TDFs were computed according to the proposed formula and the corresponding given coefficients. The comparison showed that for all experimentally studied ternary gas systems the qualitative and quantitative agreement between experimental and calculated values is observed within their errors. On the basis of published experimental data one can conclude, that the proposed method allows to calculate TDFs for ternary gas mixtures. The calculation error is within 3-10 % for validity of 0,95.