Testing intermolecular potential functions using transport property data. Part 3.—Binary diffusion coefficient of methane + perfluoromethane
Abstract
The binary diffusion coefficient D12 for methane + perfluoromethane has been measured by a two-bulb method at 302.8, 323.2 and 342.9 K, and the application of a simple “inversion” technique gives three points on an effective spherically averaged intermolecular pair potential. Comparison with the spherical CH4-CF4 potential obtained from a full inversion of interaction viscosities indicates differences in the separation at a given energy of the order of 2 %.