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TECHNICAL PAPERS: Forced Convection

The Optimum Height of Winglet Vortex Generators Mounted on Three-Row Flat Tube Bank Fin

[+] Author and Article Information
S. D. Gao, L. B. Wang, Y. H. Zhang, F. Ke

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

J. Heat Transfer 125(6), 1007-1016 (Nov 19, 2003) (10 pages) doi:10.1115/1.1621900 History: Received January 09, 2003; Revised July 29, 2003; Online November 19, 2003
Copyright © 2003 by ASME
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References

Figures

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Schematic view of a finned 3-row flat tube bank with mounted delta winglet vortex generators
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Experimental setup: (a) flow passages between fins; (b) plate forming flow passage; (c) fin surface I; (d) fin surface II; and (e) flat tube cast out of naphthalene.
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Flat tube bank parameters and positions of VGs: (a) configuration; (b) shape of VG; and (c) positions of 9 labeled cross-sections.
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Numerical model to get the heat transferred from fin: (a) channel of simulation model; (b) domain of simulation; and (c) grid system.
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Comparison of local Nu distribution on fin surface II: (a) without VGs, Re=1797; (b) with VGs, Re=1853,H=3 mm; (c) with VGs, Re=1836,H=4 mm; and (d) with VGs, Re=1796,H=5 mm.
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Comparison of local Nu distribution on fin surface I: (a) with VGs, Re=1853,H=3 mm (b) with VGs, Re=1836,H=4 mm; and (c) with VGs, Re=1796,H=5 mm.
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Effects of H on spanwise local Nu/Nu0 on fin surface II
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Effects of H on spanwise local Nu/Nu0 on fin surface I
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Comparison of span-averaged Nu on the fin surfaces I and II at different H
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Effects of H on span-averaged Nu on the fin surfaces I and II
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Effects of H on average Nu and f at different Re
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Effects of fin thickness on optimum H
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Effects of fin materials (heat conductivity) on optimum H

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