標題: Condensing heat transfer coefficients of R134a in smooth and grooved multiport flat tubes of automotive heat exchanger: An experimental investigation
作者: Ammar, Syed Muhammad
Abbas, Naseem
Abbas, Saleem
Ali, Hafiz Muhammad
Hussain, Iftikhar
Janjua, Muhammad Mansoor
Sajjad, Uzair
Dahiya, Anurag
交大名義發表
National Chiao Tung University
關鍵字: Automotive heat exchanger;Flattened tube;R134a;Heat transfer coefficient;Pure two-phase vapor
公開日期: 1-五月-2019
摘要: Condensation heat transfer coefficient of R134a was obtained in multi-port micro channel smooth and grooved flat tubes of automotive heat exchanger. The test consisted of two smooth and one grooved tube. The test range covered mass flux 490-1600 kg/m(2) s, heat flux 5.5-19 kW/m(2) and saturation temperature 51-68 degrees C. Results revealed that condensation heat transfer coefficient increased with an increment of mass flux, vapor quality and decreased with the increase of saturation temperature. The effect of heat flux on heat transfer coefficient was negligible. The grooved tube showed larger heat transfer coefficient than that of smooth tubes. A comparison of the present data of flat tube with existing correlations revealed that the heat transfer coefficient was not reasonably predicted, therefore new correlation was developed for heat transfer coefficient that predicted 86% data within +/- 30% with a mean error of 16%. (C) 2019 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.01.047
http://hdl.handle.net/11536/151630
ISSN: 0017-9310
DOI: 10.1016/j.ijheatmasstransfer.2019.01.047
期刊: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume: 134
起始頁: 366
結束頁: 376
顯示於類別:期刊論文