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Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2011003032
pages 361-374

NUMERICAL SIMULATION ON TURBULENT FLUID FLOW AND HEAT TRANSFER ENHANCEMENT OF A TUBE BANK FIN HEAT EXCHANGER WITH MOUNTED VORTEX GENERATORS ON THE FINS

Wan-Ling Hu
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China; Key Laboratory of Railway Vehicle Thermal Engineering (Lanzhou Jiaotong University), Ministry of Education of China, Lanzhou, 730070, China
Yong-Heng Zhang
Key Laboratory of Railway Vehicle Thermal Engineering (Lanzhou Jiaotong University) Ministry of Education, Lanzhou, 730070 P. R. China;Department of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070 P. R. China
Liang-Bi 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

RÉSUMÉ

Three-dimensional turbulent flow and heat transfer enhancement in the channel formed by staggered tube bank fin heat exchangers with vortex generators (VGs) were studied using a numerical method. Numerical calculations were performed in the range of Reynolds number from 3000 to 20,000. The average Nusselt number and the corresponding friction factor obtained from the numerical study were compared with those obtained from naphthalene sublimation heat/mass analogy experiments in order to validate the numerical method. It was found that the average Nusselt number for the four-row tube bank fin channel mounted with VGs increased by 30.9−47.7% over its counterpart without VGs, and the corresponding friction factor increased by 56.0−66.3%. The local Nusselt number distribution reveals that when VGs are mounted on one fin surface, they can efficiently enhance the heat transfer in the region behind the tube on both fin surfaces. The average Nusselt number increases with increasing the angle of attack θ. However, if the angle of attack is too large, the vortex may break down and decrease heat transfer enhancement. The optimum attack angle for heat transfer augmentation is about θ = 45 deg. Both the average Nu and friction factor decrease with an increase in the tube row numbers. When the Reynolds number is less than 9000, two tube rows are recommended, and when the Re is higher than 9000, the number of tube rows has a small effect on heat transfer performance.


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