We study a model for an argon-like fluid parameterized in terms of a hard-core repulsion and a two-Yukawa potential. The liquid-gas phase behavior 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%.
|Titolo:||Liquid-gas phase behavior of an argon-like fluid modelled by the hard-core two-Yukawa potential|
PINI, DAVIDE ENRICO (Primo)
|Parole Chiave:||2-Yukawa fluid ; Lennard-Jones fluid ; self-consistent Ornstein-Zernike approximation ; Monte Carlo ; critical point ; liquid-vapor transition|
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||ago-2001|
|Digital Object Identifier (DOI):||10.1063/1.1383796|
|Appare nelle tipologie:||01 - Articolo su periodico|