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Transport coefficients and the spinodal of a fluid

Vladimir G. Baidakov*

  • Institute of Thermal Physics, Ural Branch of the Russian Academy of Sciences, 106, Amundsen Street 106, 620016 Ekaterinburg, Russia

  • *Author to whom all correspondence should be addressed: bai@itp.uran.ru
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Phys. Rev. E 86, 021201 – Published 17 August, 2012

DOI: https://doi.org/10.1103/PhysRevE.86.021201

Abstract

Based on the results of computer simulation of transport coefficients in a Lennard-Jones fluid, it has been shown that in (p,T) coordinates, lines of constant values of coefficients of self-diffusion D and excess shear viscosity Δη extended into the region of superheated liquid and supersaturated vapor have an envelope. Each of the ensembles of such lines is divided into two parts by a critical isoline, where the conditions ϕ=ϕc=const (ϕ=D,Δη) are fulfilled. One part of this ensemble has as an envelope the branch of the spinodal that refers to superheated liquid; the other part has the branch of the spinodal of supersaturated vapor. The critical point of liquid-vapor equilibrium is the cusp of the spinodal, at which the critical isolines have a common tangent line with the spinodal and the binodal. Thus, at the approach to the spinodal, the relations (∂D/∂p)T→∞ and (∂Δη/∂p)T→∞ hold.

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Phys. Rev. E 86, 021201– Published 17 August, 2012
  • Received 29 May 2012

©2012 American Physical Society

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