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Technical Briefs

Tube Transverse Pitch Effect on Heat/Mass Transfer Characteristics of Flat Tube Bank Fin Mounted With Vortex Generators

[+] Author and Article Information
Song Liu, Jufang Fan, Yongheng Zhang, Yuanxin Dong, Kewei Song

Department of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, P.R. China

Liangbi Wang1

Department of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, P.R. Chinalbwang@mail.lzjtu.cn

1

Corresponding author.

J. Heat Transfer 130(6), 064502 (Apr 23, 2008) (3 pages) doi:10.1115/1.2897339 History: Received January 28, 2007; Revised September 19, 2007; Published April 23, 2008

For one heat exchanger model of three-row flat tube bank fin mounted with vortex generators (VGs), the effect of transversal tube pitch on heat/mass transfer performance was investigated by the experimental method of naphthalene sublimation. For the same arrangement of VGs around the tube, it is found that the larger the transversal tube pitch, the larger the heat transfer enhancement because of less interactions of vortices generated from different VGs. Interaction of vortices decreases the heat transfer enhancement on the fin surfaces with and without VGs for the case with small transversal tube pitch. For isothermal condition, two correlated equations of average Nusselt number and friction factor considering the fin spacing, the attack angle of VG, the height of VG, the ratio of transversal tube pitch, and Reynolds number are reported.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Flat tube bank parameters and positions of VGs: (a) configuration; (b) shape of VG

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Figure 2

Comparison of local Nua distribution on fin Surface II: (a) Rea=1119, S1∕S2=0.528; (b) Rea=1121, S1∕S2=0.727; (c) Rea=1090, S1∕S2=0.969

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Figure 3

Comparison of local Nua distribution on fin Surface I; (a) Rea=1119, S1∕S2=0.528; (b) Rea=1121, S1∕S2=0.727; (c) Rea=1090, S1∕S2=0.969

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Figure 4

Comparison of span-averaged Nua on the fin Surfaces I and II for different S1∕S2

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