フロン系冷媒R114の気液共存曲線の測定および臨界定数の決定

概要

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the measurements of the vapor-liquid coexistence curve in the critical region for R 114 (C_2CL_2F_4) 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/m^3. The experimental errors of temperature and density were estimated within ±0.5%, respectively. On the basis of there results, the critical temperature T_c and the critical density ρ_c for R114 were determined to be 418.78 K and 576 kg/m^3,respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence. The critical pressure p_c for R114 was calculated to be 3.252 Mpa by the available vapor-pressure correlation with the present value of T_c. In addition, the critical exponent β and the low of rectilinear diameter near the critical point were also discussed.
一般社団法人日本機械学会の論文
1985-04-25