Determination of the vapor-liquid coexistence curve and the critical parameters for refrigerant 502

Yukihiro Higashi, M. Uematsu, K. Watanabe

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The vapor-liquid coexistence curve for refrigerant 502 (R 502) near the critical point has been determined by visual observation of the disappearance of the meniscus. Twenty-six saturated densities between 262 and 899 kg· m-3 have been obtained within an experimental error in temperature and density of ± 10 mK and ± 0.5%, respectively. Using these results along the vapor-liquid coexistence curve, the critical parameters, i.e., the critical temperature Tc=355.37 ±0.01 K and the critical density ρc=555±3kg · m-3, have been determined based on the disappearance of the meniscus level as well as on the intensity of the critical opalescence. A critical pressure Pc=4.070±0.002 MPa has been calculated from the existing vapor-pressure correlation using the present Tcvalue. In addition, the critical exponent β along the coexistence curve and the law of rectilinear diameter near the critical point are discussed.

Original languageEnglish
Pages (from-to)117-129
Number of pages13
JournalInternational Journal of Thermophysics
Volume5
Issue number2
DOIs
Publication statusPublished - Jun 1 1984

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refrigerants
menisci
vapors
critical point
curves
liquids
opalescence
visual observation
critical pressure
vapor pressure
critical temperature
exponents
temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Determination of the vapor-liquid coexistence curve and the critical parameters for refrigerant 502. / Higashi, Yukihiro; Uematsu, M.; Watanabe, K.

In: International Journal of Thermophysics, Vol. 5, No. 2, 01.06.1984, p. 117-129.

Research output: Contribution to journalArticle

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N2 - The vapor-liquid coexistence curve for refrigerant 502 (R 502) near the critical point has been determined by visual observation of the disappearance of the meniscus. Twenty-six saturated densities between 262 and 899 kg· m-3 have been obtained within an experimental error in temperature and density of ± 10 mK and ± 0.5%, respectively. Using these results along the vapor-liquid coexistence curve, the critical parameters, i.e., the critical temperature Tc=355.37 ±0.01 K and the critical density ρc=555±3kg · m-3, have been determined based on the disappearance of the meniscus level as well as on the intensity of the critical opalescence. A critical pressure Pc=4.070±0.002 MPa has been calculated from the existing vapor-pressure correlation using the present Tcvalue. In addition, the critical exponent β along the coexistence curve and the law of rectilinear diameter near the critical point are discussed.

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