ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
We present a new analytic fluid-phase equation of state (EOS) of binary nonadditive hard sphere mixtures having equal collision diameters (d11=d22=d) between like species, but having an unequal collision diameter (d12) between unlike species. For this purpose, we have generated EOS data by Monte Carlo simulations over a wide range of density, composition, and d12. The analytic EOS produces reliable results for d12≥d and d12〈d. These results are used to test the van der Waals one-fluid model of mixtures and the modified Martynov and Sarkisov integral equation [Mol. Phys. 59, 275 (1986)]. Short-range structures at high density reveal a broad peak in heterocoordinated packing and a minimum in homocoordination as d12 is reduced below d. The present analysis also strongly indicates, in agreement with available data, a fluid–fluid phase change at high density when d12(approximately-greater-than)d.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.466712
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