Evidence of double criticality in a fluid model with density-dependent interactions



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Almarza, N. G. and Lomba, Enrique and Ruiz, Guiomar and Fernández Tejero, Carlos (2001) Evidence of double criticality in a fluid model with density-dependent interactions. Physical Review Letters, 86 (10). pp. 2038-2041. ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.86.2038


Evidence of a liquid-liquid equilibrium in simple fluids has recently been exposed for a density-dependent pair potential in the framework of a van der Waals theory. Here this double criticality is investigated by means of computer simulation, a perturbation theory, and integral equation theory. It is found that the critical point estimated from the integral equation thermodynamics is not associated with divergent correlations. To cope with these features, a special simulation procedure, based on the definition of local densities, is devised. Monte Carlo calculations confirm the existence of two critical points, in agreement with the predictions of perturbation theory.

Item Type:Article
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© 2001 The American Physical Society. We acknowledge financial support from the Dirección General de Enseñanza Superior e Investigación Científica (DGESCYT) under Grants No. PB98-0673-C02-02 (N.G. A.), No. PB97-0258-C02-02 (E. L.), and No. PB97-0004-C03-03 (G. R. and C. F. T.).

Uncontrolled Keywords:Attractive forces; Phase-diagram
Subjects:Sciences > Physics > Thermodynamics
ID Code:23767
Deposited On:04 Dec 2013 13:30
Last Modified:02 Nov 2015 13:52

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