文献类型：期刊文献

英文题名：Heat Transfer Enhancement Using R1234yf Refrigerants in Micro-Ribbed Tubes in a Two-Phase Flow Regime

作者：Shen, Daoming[1];Zhang, Xia[1];He, Wei[1];Xia, Jinhong[1];Xue, Songtao[2]

第一作者：申道明

通讯作者：Shen, DM[1]

机构：[1]Xinxiang Univ, Sch Civil Engn & Architecture, Xinxiang, Henan, Peoples R China;[2]Tohoku Inst Technol, Dept Architecture, Sendai, Miyagi 9828577, Japan

第一机构：新乡学院土木工程与建筑学院

通讯机构：[1]corresponding author), Xinxiang Univ, Sch Civil Engn & Architecture, Xinxiang, Henan, Peoples R China.|[1107114]新乡学院土木工程与建筑学院;[11071]新乡学院;

年份：2020

卷号：16

期号：6

起止页码：1259-1272

外文期刊名：FDMP-FLUID DYNAMICS & MATERIALS PROCESSING

收录：EI(收录号：20210209757362);Scopus(收录号：2-s2.0-85099028364);WOS:【ESCI(收录号:WOS:000600016000012)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 41877251).

语种：英文

外文关键词：R1234yf; micro-ribbed tube; heat transfer coefficient; heat transfer enhancement factor

摘要：Experiments about heat transfer in the presence of a two-phase flow due to the condensation of a R1234yf refrigerant have been performed considering a smooth tube and two micro-fin tubes. The following experimental conditions have been considered: Condensation temperatures of 40 degrees C, 43 degrees C and 45 degrees C, mass fluxes of 500-900 kg/(m(2).s), vapor qualities at the inlet and outlet of the heat transfer tube in the ranges 0.8-0.9 and 0.2-0.3, respectively. These tests have shown that: (1) The heat transfer coefficient increases with decreasing the condensation temperature and on increasing the mass flux; (2) The heat transfer coefficient inside the micro-fin tube is larger than that for the smooth tube; (3) The heat transfer enhancement factors for the micro-fin tube with a fin helical angle of 8 degrees and 15 degrees are 2.51-2.89 and 3.11-3.57, respectively; both are higher than the area increase ratio. These experimental results have been compared with correlations available in the literature: the Cavallini et al. correlation has the highest accuracy in predicting the heat transfer coefficient inside the smooth tube, the related percentage error and the average prediction error are +/- 8% and 0.56%, respectively; for the micro-fin tube these become +/- 25% and 6%, respectively.