リブ付き偏平流路内の冷媒の流動と蒸発熱伝達 : クロスリブ付き流路内の上昇流と下降流

概要

論文の詳細を見る
Studies on evaporative heat transfer and pressure drop in a vertical smooth and a cross-ribbed channel were conducted using R-12 as a working fluid. Experimental data were obtained for upflow and downflow at mass velocities between 50 and 140 kg/m^2s and mass qualities between 0.1 and 0.8. Comparison of these data indicates that in the cross-ribbed channel the heat transfer coefficient increases by as much as a factor of about 3 above the smooth channel under the same conditions, and the heat transfer coefficient for upflow is better than that for downflow by 30 to 70% both in the smooth and ribbed channels. In addition, evaluation of these channels using the volume goodness factor shows that the heat transfer performance of the cross-ribbed channel is superior to that of the smooth channel by 20 to 80% under the same pumping power condition.
一般社団法人日本機械学会の論文
1990-06-25