鉛直円管内における非共沸2成分混合媒体上昇流の蒸発熱伝達に関する数値解析

概要

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Numerical analysis has been conducted for evaporating annular two-phase flow of nonazeotropic binary mixtures flowing upward in a vertical tube. The equations of continuity, momentum, energy and mass transfer for each phase have been solved numerically by a finite volume method. The model expressing the interfacial wave effect on momentum, heat, and mass transfers has been applied to the analysis. The computational results of the local heat transfer coefficient agree fairly well with experimental data previously reported by others for the evaporation of R11-R113. Therefore, the validity of the present method is confirmed. The present analysis can also predict the local evaporation rate of each component. From the results of numerical study for three types of binary mixtures, R11-R113, R22-R114 and R22-R11, it is confirmed that the greater the difference between the bubble-point and dew-point curves, the more noticeable is the effect of the low rate of mass diffusion, which causes a decrease in heat transfer efficiency.
社団法人日本機械学会の論文
1992-06-25