社団法人日本機械学会 Acta Medica Okayama 0387-5016 57 535 1991 非共沸混合冷媒R114/R113の水平二重管環状部における凝縮 : 圧力降下と物質伝達の整理 224 230 EN Shigeru Nozu Kouichi Ozaki Hideo Inaba Hiroshi Honda Frictional pressure gradient and vapor phase mass transfer correlations were developed for condensation of nonazeotropic refrigerant mixture R114/R113 in the annuli of horizontal double tubes with an enhanced inner tube. The frictional pressure gradient data were correlated fairly well by a previously developed empirical equation for condensation of pure refrigerants. The vapor phase mass transfer correlation was based on the previous results for turbulent flow in smooth and rough tubes with and without surface suction. For given conditions of vapor and tube wall, the heat transfer coefficient can be calculated by using the correlations for the vapor phase mass transfer coefficient and the heat transfer coefficient for the condensate film. The calculated values agree with the measured data to a mean absolute deviation of 14.3%. No potential conflict of interest relevant to this article was reported.