To find the reasons of heat transfer enhancement of a laminar convective heat transfer process in a channel at a uniform heat flux boundary when a pair of longitudinal vortex generators (VGs) is mounted on the bottom wall, the laminar convective heat transfer process in the channel is investigated numerically in a frame built up by the convective transport equation of the heat flux. The results show that longitudinal vortices greatly increase the local convection contribution terms that determine the local intensity of the convective transport of the heat flux component in the span direction, and that the increased local contribution terms intensify the local convective transport of the heat flux component in the same direction. This process increases the convection contribution terms that determine the convective transports of the heat flux components in the main stream direction and in the normal direction of the channel walls. The increase in these convection contribution terms results in an enhancement of the convective heat transfer ability on the channel walls, and then, the heat transfer is enhanced by longitudinal vortices. When the span-averaged characteristic is numerically counted, longitudinal vortices are found to have no contribution on the span-averaged convective transport of the heat flux in the span direction.
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December 2017
This article was originally published in
Journal of Heat Transfer
Research-Article
The Reasons of Heat Transfer Enhancement in a Laminar Channel Flow With Uniform Heat Flux on the Wall Under a Pair of Longitudinal Vortex Generators Mounted on the Bottom Wall
Qiang Zhang,
Qiang Zhang
School of Mechanical Engineering,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Key Laboratory of Railway Vehicle
Thermal Engineering,
Lanzhou Jiaotong University,
Ministry of Education,
Lanzhou 730070, Gansu, China
e-mail: zhangqiang@mail.lzjtu.cn
Thermal Engineering,
Lanzhou Jiaotong University,
Ministry of Education,
Lanzhou 730070, Gansu, China
e-mail: zhangqiang@mail.lzjtu.cn
Search for other works by this author on:
Liang-Bi Wang
Liang-Bi Wang
School of Mechanical Engineering,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Key Laboratory of Railway Vehicle
Thermal Engineering,
Lanzhou Jiaotong University,
Ministry of Education,
Lanzhou 730070, Gansu, China
e-mail: lbwang@mail.lzjtu.cn
Thermal Engineering,
Lanzhou Jiaotong University,
Ministry of Education,
Lanzhou 730070, Gansu, China
e-mail: lbwang@mail.lzjtu.cn
Search for other works by this author on:
Qiang Zhang
School of Mechanical Engineering,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Key Laboratory of Railway Vehicle
Thermal Engineering,
Lanzhou Jiaotong University,
Ministry of Education,
Lanzhou 730070, Gansu, China
e-mail: zhangqiang@mail.lzjtu.cn
Thermal Engineering,
Lanzhou Jiaotong University,
Ministry of Education,
Lanzhou 730070, Gansu, China
e-mail: zhangqiang@mail.lzjtu.cn
Liang-Bi Wang
School of Mechanical Engineering,
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Lanzhou Jiaotong University,
Lanzhou 730070, Gansu, China;
Key Laboratory of Railway Vehicle
Thermal Engineering,
Lanzhou Jiaotong University,
Ministry of Education,
Lanzhou 730070, Gansu, China
e-mail: lbwang@mail.lzjtu.cn
Thermal Engineering,
Lanzhou Jiaotong University,
Ministry of Education,
Lanzhou 730070, Gansu, China
e-mail: lbwang@mail.lzjtu.cn
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received August 28, 2016; final manuscript received May 20, 2017; published online July 25, 2017. Assoc. Editor: Jim A. Liburdy.
J. Heat Transfer. Dec 2017, 139(12): 121701 (15 pages)
Published Online: July 25, 2017
Article history
Received:
August 28, 2016
Revised:
May 20, 2017
Citation
Zhang, Q., and Wang, L. (July 25, 2017). "The Reasons of Heat Transfer Enhancement in a Laminar Channel Flow With Uniform Heat Flux on the Wall Under a Pair of Longitudinal Vortex Generators Mounted on the Bottom Wall." ASME. J. Heat Transfer. December 2017; 139(12): 121701. https://doi.org/10.1115/1.4037080
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