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research-article

Investigation on Heat transfer performance and Flow resistance characteristics in Finned-tube heat exchangers with different vortex generator position

[+] Author and Article Information
Wang Qiang

School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
wqiang91@whut.edu.cn

Qian Zuoqin

School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
qzqwhut@163.com

Cheng Junlin

School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
junlin.sant@gmail.com

Ren Jie

School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
j.ren@whut.edu.cn

Huang Weilong

School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
hwl220@whut.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4042008 History: Received September 01, 2018; Revised November 11, 2018

Abstract

The numerical simulation was carried out to investigate mechanism of the heat transfer enhancement in the fin-and-tube heat exchangers. As known, the vortex generators were widely used to improve the thermal performance with bad flow resistance characteristics and led to bad comprehensive performance. This paper was aimed to expound the mechanism of thermal hydraulic characteristics and explore the effect of vortex generators position on the comprehensive performance. Three types of fins (Type 1, Type 2, and Type 3) were discussed in this paper. The j factor, f factor and PEC of three types of vortex generators in different positions were discussed and compared. Based on the numerical results, a detailed description of the effect of three types of vortex generators on the heat transfer performance and flow resistance characteristics was presented at different Reynolds number in the range between 1300 and 2000. In addition, local velocity distribution, local temperature distribution and local pressure drop distribution were analyzed and discussed. And the effect of VG angle on the thermal performance and flow resistance were presented. It can be concluded that the main heat transfer occurred in the region before the tube, and the wake region behind the tube was harmful to improve the thermal performance and reduce the flow resistance. Besides, vortex generator in the wake region was obviously beneficial to the enhancement of the thermal performance with less energy loss.

Copyright (c) 2018 by ASME
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