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Technical Brief

Experimental Study on Heat Transfer Performances of Flat Tube Bank Fin Heat Exchanger Using Four Different Fin Patterns

[+] Author and Article Information
Feng-Cai Zheng

School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
584287489@qq.com

Song Liu

School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
liusongtd@mail.lzjtu.cn

Zhi-Min Lin

School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
linzm.lzjtu@163.com

Jaafar Nugud

School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
jaafardirar@hotmail.com

Liang-Chen Wang

School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
lcwang1967@163.com

Lin-Min Chang

School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
changlm@mail.lzjtu.cn

Liangbi Wang

Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; School of Chemistry and Chemical Engineering Science, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
lbwang@mail.lzjtu.cn

1Corresponding author.

ASME doi:10.1115/1.4038419 History: Received August 02, 2016; Revised September 08, 2017

Abstract

Air-side heat transfer and flow friction characteristics of four different fin patterns used in flat tube bank fin heat exchangers are investigated experimentally. These fin patterns are the fin with six dimples, the fin with nine dimples, the double louvered fin, and the fin with delta-winglet vortex generators (VGs). The counterpart plain fins (plain fin I and plain fin II) are selected as references for evaluating the heat transfer enhancement performance of the studied fin patterns under identical pump power constraints. The fin with the six dimples behaves better in terms of heat transfer performance than that with nine dimples for the studied cases. The heat transfer performance of the fin with delta-winglet VGs is better than that of the double louvered fin, and the performance of the latter is better than that of the fins with six and nine dimples. Correspondingly, in the tested range of Reynolds numbers, the thermal performance factors of the four different fin patterns, the fin with six dimples, the fin with nine dimples, the double louvered fin, and the fin with delta-winglet vortex generators (VGs), are 1.4-1.6, 1.3-1.6, 1.2-1.3 and 1.1-1.2, respectively. The correlations of Nusselt number and friction factor with Reynolds number for the fins with six/nine dimples and the double louvered fin are obtained. These correlations would be used to design flat tube bank ?n heat exchangers.

Copyright (c) 2017 by ASME
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