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Vapor-liquid equilibria, scaling, and crossover in aqueous solutions of sodium chloride near the critical line

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  • Povodyrev, A.A.
  • Anisimov, M.A.
  • Sengers, J.V.
  • Levelt Sengers, J.M.H.

Abstract

We have developed a crossover scaling model for describing the thermodynamic properties of near-critical binary fluids. We have validated this model for the vapor-liquid equilibrium properties of mixtures of methane and ethane. We then apply the model to a most intriguing binary fluid, namely aqueous solutions of sodium chloride, so as to describe densities and concentrations at vapor-liquid equilibrium and isochoric specific heat capacities in the one-phase region. The description shows crossover from asymptotic Ising-like critical behavior to classical (mean-field) behavior. As the salt concentration increases, the region of Ising behavior decreases, although pure classical behavior is never attained. We suggest that processes of association/dissociation may be responsible for the failure of the model to describe compositions of the vapor phase of the solutions at very low concentrations.

Suggested Citation

  • Povodyrev, A.A. & Anisimov, M.A. & Sengers, J.V. & Levelt Sengers, J.M.H., 1997. "Vapor-liquid equilibria, scaling, and crossover in aqueous solutions of sodium chloride near the critical line," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 244(1), pages 298-328.
    • Handle: RePEc:eee:phsmap:v:244:y:1997:i:1:p:298-328
    DOI: 10.1016/S0378-4371(97)00300-2
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    References listed on IDEAS

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