Transport in Dense Square-Well Fluid Mixtures

Abstract

A simple kinetic theory of transport in a dense fluid of square‐well molecules, due to Longuet‐Higgins and Valleau, is here extended to mixtures. A minor extension of the original set of postulates is required. The ratio, κ/η=5/3, of the bulk and shear viscosities is again obtained and the purely diffusive Onsager relations are obeyed. In the case of a two‐component ``isotopic'' mixture, it is possible to show that the Onsager relation linking the Soret and Dufour effects is also obeyed. In this and other respects the results differ from some others recently published on the same problem and some reasons for this are discussed.