SURFACE TENSION EFFECT ON HEAT TRANSFER COEFFICIENT OF CONDENSED GASES FLOW INSIDE MICROPIPE HEAT EXCHANGER

摘要

Experimental and analytical investigation was carried out in this study to show the effect of surface tensionrnon the heat transfer coefficient of gases flow inside micropipe heat exchangers during condensation process.rnAnalytical empirical correlation was formulated for the convectional heat transfer coefficient of two phasernflow inside micropipe heat exchangers. Carbon dioxide (CO_2) was used as working fluid. A comparisonrnbetween experimental results and that obtained by developed correlation were carried out, and a comparisonrnbetween these results and literature published correlations were carried out too. The results of this researchrnshowed that the predicted heat transfer coefficient of the proposed correlation was more closely forrnexperimental results than other correlations results, this is because of considering of the surface tension.