A test of the mean density approximation for Lennard-Jones mixtures with large size ratios View Full Text


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Article Info

DATE

1986-03

AUTHORS

J. F. Ely

ABSTRACT

The mean density approximation for mixture radial distribution functions plays a central role in modern corresponding-states theories. This approximation is reasonably accurate for systems that do not differ widely in size and energy ratios and which are nearly equimolar. As the size ratio increases, however, or if one approaches an infinite dilution of one of the components, the approximation becomes progressively worse, especially for the small molecule pair. In an attempt to better understand and improve this approximation, isothermal molecular dynamics simulations have been performed on a series of Lennard-Jones mixtures. Thermodynamic properties, including the mixture radial distribution functions, have been obtained at seven compositions ranging from 5 to 95 mol%. In all cases the size ratio was fixed at two and three energy ratios were investigated, ɛ22/ɛ11=0.5, 1.0, and 1.5. The results of the simulations are compared with the mean density approximation and a modification to integrals evaluated with the mean density approximation is proposed. More... »

PAGES

381-393

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00500163

DOI

http://dx.doi.org/10.1007/bf00500163

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1012322937


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