Measurements of the Vapor-Liquid Coexistence Curve and Determination of the Critical Parameters for R 114

Yukihiro Higashi, Masahiko Uematsu, Koichi Watanabe

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Abstract

The measurements of the vapor-liquid coexistence curve in the critical region for R 114 (C2Cl2F4) were made by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. Twenty-three saturated densities between 410 K and critical temperature were obtained in the range of densities 290 to 894 kg/m3. The experimental errors of temperature and density were estimated within ±15mK and ±0.5%, respectively. On the basis of these results, the critical temperature Tc and the critical density ρc for R 114 were determined to be 418.78 K and 576 kg/m3, respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence. The critical pressure Pc for R 114 was calculated to be 3.252 MPa by the available vapor-pressure correlation with the present value of Tc. In addition, the critical exponent β and the law of rectilinear diameter near the critical point were also discussed.

Original languageEnglish
Pages (from-to)1327-1333
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume51
Issue number464
DOIs
Publication statusPublished - Jan 1 1985

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Vapors
vapors
menisci
Liquids
curves
liquids
critical temperature
opalescence
Vapor pressure
Temperature
visual observation
liquid-vapor interfaces
critical pressure
vapor pressure
critical point
exponents
temperature
cells

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "Measurements of the Vapor-Liquid Coexistence Curve and Determination of the Critical Parameters for R 114",
abstract = "The measurements of the vapor-liquid coexistence curve in the critical region for R 114 (C2Cl2F4) were made by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. Twenty-three saturated densities between 410 K and critical temperature were obtained in the range of densities 290 to 894 kg/m3. The experimental errors of temperature and density were estimated within ±15mK and ±0.5{\%}, respectively. On the basis of these results, the critical temperature Tc and the critical density ρc for R 114 were determined to be 418.78 K and 576 kg/m3, respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence. The critical pressure Pc for R 114 was calculated to be 3.252 MPa by the available vapor-pressure correlation with the present value of Tc. In addition, the critical exponent β and the law of rectilinear diameter near the critical point were also discussed.",
author = "Yukihiro Higashi and Masahiko Uematsu and Koichi Watanabe",
year = "1985",
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doi = "10.1299/kikaib.51.1327",
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TY - JOUR

T1 - Measurements of the Vapor-Liquid Coexistence Curve and Determination of the Critical Parameters for R 114

AU - Higashi, Yukihiro

AU - Uematsu, Masahiko

AU - Watanabe, Koichi

PY - 1985/1/1

Y1 - 1985/1/1

N2 - The measurements of the vapor-liquid coexistence curve in the critical region for R 114 (C2Cl2F4) were made by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. Twenty-three saturated densities between 410 K and critical temperature were obtained in the range of densities 290 to 894 kg/m3. The experimental errors of temperature and density were estimated within ±15mK and ±0.5%, respectively. On the basis of these results, the critical temperature Tc and the critical density ρc for R 114 were determined to be 418.78 K and 576 kg/m3, respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence. The critical pressure Pc for R 114 was calculated to be 3.252 MPa by the available vapor-pressure correlation with the present value of Tc. In addition, the critical exponent β and the law of rectilinear diameter near the critical point were also discussed.

AB - The measurements of the vapor-liquid coexistence curve in the critical region for R 114 (C2Cl2F4) were made by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. Twenty-three saturated densities between 410 K and critical temperature were obtained in the range of densities 290 to 894 kg/m3. The experimental errors of temperature and density were estimated within ±15mK and ±0.5%, respectively. On the basis of these results, the critical temperature Tc and the critical density ρc for R 114 were determined to be 418.78 K and 576 kg/m3, respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence. The critical pressure Pc for R 114 was calculated to be 3.252 MPa by the available vapor-pressure correlation with the present value of Tc. In addition, the critical exponent β and the law of rectilinear diameter near the critical point were also discussed.

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JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

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