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Liquid-gas phase behaviour of an argon-like fluid modelled by the hard-core two-Yukawa potential

D. Pini·G. Stell·N. B. Wilding
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Abstract

We study a model for an argon-like fluid parameterised in terms of a hard-core repulsion and a two-Yukawa potential. The liquid-gas phase behaviour of the model is obtained from the thermodynamically self-consistent Ornstein-Zernike approximation (SCOZA) of Hoye and Stell, the solution of which lends itself particularly well to a pair potential of this form. The predictions for the critical point and the coexistence curve are compared to new high resolution simulation data and to other liquid-state theories, including the hierarchical reference theory (HRT) of Parola and Reatto. Both SCOZA and HRT deliver results that are considerably more accurate than standard integral-equation approaches. Among the versions of SCOZA considered, the one yielding the best agreement with simulation successfully predicts the critical point parameters to within 1%.

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D. Pini, G. Stell, N. B. Wilding. 2001-03-13. Liquid-gas phase behaviour of an argon-like fluid modelled by the hard-core two-Yukawa potential. https://doi.org/10.1063/1.1383796

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