Thermodynamic stability of single-phase fluids and fluid mixtures under the influence of gravity

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Abstract

The equilibrium state attained by a single-phase fluid or fluid mixture when under the influence of gravity and subject to given external constraints differs, as is well known, from its gravity-free counterpart. The thermodynamic stability of single-phase fluids and their mixtures, however, is shown to be uninfluenced by the presence of gravity. Single-phase fluids and their mixtures are thermodynamically stable when under the influence of gravity if, and only if, the gravity-free stability criteria are satisfied everywhere throughout the fluid volume. Gravitational fields, therefore, introduce no additional mechanism whereby spontaneous fluctuations can destabilize an equilibrium state.

Original languageEnglish (US)
Pages (from-to)6881-6888
Number of pages8
JournalThe Journal of chemical physics
Volume89
Issue number11
DOIs
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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