Correlation and prediction of interface tension for fluid mixtures: An approach based on cubic equations of state with the wong-sandler mixing rule

Andrés Mejía, Hugo Segura, Jaime Wisniak, Ilya Polishuk

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Concentration profiles, interface thickness, and interface tensions have been calculated for mixtures applying the gradient theory to the Peng-Robinson equation of state. The approach is based on an accurate local fit of vapor-liquid equilibrium (VLE) data, and, for this purpose, the flexibility of the original Wong-Sandler mixing rule has been taken into account. Correlation and prediction capabilities of experimental interfacial tension data are analyzed for the quadratic mixing rule and the present approach. The method, which is discussed in detail in this work, provides an improved scheme for calculating interfacial properties, both for polar and nonpolar mixtures. According to results, a better correlation and prediction of the interfacial tensions can be obtained from an adequate interpolation of the VLE, using simple cubic equations of state. Examples are presented for binary and ternary mixtures.

Original languageEnglish
Pages (from-to)215-224
Number of pages10
JournalJournal of Phase Equilibria and Diffusion
Volume26
Issue number3
DOIs
StatePublished - 1 Aug 2005

Keywords

  • Gradient Theory
  • Interfacial Tension
  • Phase Equilibrium
  • Ternary Mixture
  • Vapor Pressure Data

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

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