Procedures for determining the critical parameters of fluids

DOI PDF 5 Citations
  • S. Okazaki
    Department of Mechanical Engineering, Keio University, Yokohama 223, Japan
  • Y. Higashi
    Department of Mechanical Engineering, Keio University, Yokohama 223, Japan
  • Y. Takaishi
    Department of Mechanical Engineering, Keio University, Yokohama 223, Japan
  • M. Uematsu
    Department of Mechanical Engineering, Keio University, Yokohama 223, Japan
  • K. Watanabe
    Department of Mechanical Engineering, Keio University, Yokohama 223, Japan

Abstract

<jats:p>An apparatus and procedures to determine the critical parameters and the vapor–liquid coexistence curve in the critical region by observing the disappearance of the vapor–liquid interface are described. The apparatus has the advantage of measuring the saturated vapor and liquid densities with only a single filling of the sample, and the procedures are applicable not only to pure fluids but also to mixtures. Three densities of liquid and eight of vapor on the coexistence curve for trifluoromethane are obtained, and the critical temperature, density, and pressure are also determined.</jats:p>

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