Abstract
We derive a systematic method for determining effective molecular size parameters for use in perturbation theories of dense fluid mixtures using non-spherical reference systems of hard convex bodies. The method is based on the compressibility theorem. For the case of mixtures of atomic fluids, the method reduces to a prescription suggested earlier by one of the authors. For molecular fluid mixtures where a reference system of hard ellipsoids is employed, a sufficient set of equations to determine the size and shape of the equivalent ellipsoids is derived. The method is applied to the benchmark system of an equimolar mixture of Ar/Kr at 115·8 K.
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