Abstract
The velocity cross correlation integrals
can be estimated from the intradiffusion coefficients D °1 and D °2 at each mole fraction x1 of component 1 on the basis of the exact relations among the Onsager phenomenological coefficients together with an assumed equation relating the joint diffusion coefficients D Jab . The results from several such equations are compared with experimental data and with similar results derived by Hertz in a different way to represent the behavior of f ab ≡D J ab x b in ideal reference systems. In some cases the agreement with experimental data for relatively ideal systems is even better than given by Hertz's results. For greater accuracy in predicting the D Jab from D dga data one would need a prediction of the limiting value of D Jaa at xa=0 for a=1,2. Presently known theory does not give a basis for estimating this limit reliably.
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Friedman, H.L., Mills, R. Velocity cross correlations in binary mixtures of simple fluids. J Solution Chem 10, 395–409 (1981). https://doi.org/10.1007/BF00658008
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DOI: https://doi.org/10.1007/BF00658008