Phase equilibrium calculations for confined fluids, including surface tension prediction models

R. O. Espósito, F. W. Tavares, M. Castier

Research output: Contribution to journalArticle

9 Citations (Scopus)


Phase equilibrium calculations for fluids confined inside capillary tubes or porous media are formulated using the isofugacity equations. In this situation, the phase pressures are not equal and it is assumed that they are related by the Laplace equation. With this formulation, existing procedures for phase equilibrium calculations can be readily modified to include capillary effects. In this paper, we review some of the main authors who have studied the behavior of fluids inside porous media and perform bubble- and dew-point calculations for pure components and mixtures, using the Peng-Robinson equation of state to model the coexisting phases and several planar surface tension models. Comparisons with results from the literature indicate that the proposed formulation is adequate for representing phase equilibrium inside capillary tubes.

Original languageEnglish
Pages (from-to)93-104
Number of pages12
JournalBrazilian Journal of Chemical Engineering
Issue number1
Publication statusPublished - Jan 2005
Externally publishedYes



  • Confined fluids
  • Laplace equation
  • Phase equilibrium
  • Porous media
  • Surface tension

ASJC Scopus subject areas

  • Chemical Engineering(all)

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