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TECHNICAL PAPERS

Experimental Study of the Flow in a Compact Heat Exchanger Channel With Embossed-Type Vortex Generators

[+] Author and Article Information
F. Dupont, C. Gabillet, P. Bot

Institut de Recherche de l’Ecole-Navale, F29240 Brest-Naval, France

J. Fluids Eng 125(4), 701-709 (Aug 27, 2003) (9 pages) doi:10.1115/1.1595675 History: Received April 04, 2002; Revised March 03, 2003; Online August 27, 2003
Copyright © 2003 by ASME
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References

Jacobi,  A. M., and Shah,  R. K., 1995, “Heat Transfer Surface Enhancement Through the Use of Longitudinal Vortices: A Review of Recent Progress,” Exp. Therm. Fluid Sci., 11, pp. 295–709.
Fiebig,  M., 1995, “Vortex Generators for Compact Heat Exchangers,” Journal of Enhanced Heat Transfer,2(1–2), pp. 43–61.
Shabaka,  I. M. M. A., Metha,  R. D., and Bradshaw,  P., 1985, “Longitudinal Vortices Embedded in Turbulent Boundary Layers. Part 1 Single Vortex,” J. Fluid Mech., 155, pp. 37–57.
Mehta,  R. D., and Bradshaw,  P., 1988, “Longitudinal Vortices Embedded in Turbulent Boundary Layers. Part 2, Vortex Pair With Common Flow Upwards,” J. Fluid Mech., 188, pp. 529–546.
Gentry,  M. C., and Jacobi,  A. M., 1996, “Heat Transfer Enhancement by Delta-Wing Vortex Generators on a Flat Plate: Vortex Interactions With the Boundary Layer,” Exp. Therm. Fluid Sci., 14, pp. 231–642.
Eibeck,  P. A., and Eaton,  J. K., 1987, “Heat Transfer Effects of a Longitudinal Vortex Embedded in a Turbulent Boundary Layer,” Trans. ASME, 109 , Feb.
Yanagihara,  J. I., and Torii,  K., 1992, “Enhancement of Laminar Boundary Layer Heat Transfer by a Vortex Generator,” JSME Int. J., 35(3), pp. 400–405.
Fiebig, M., Mitra, N., and Dong, Y., 1990, “Simultaneous Heat Transfer Enhancement and Flow Loss Reduction of Fin-Tubes,” 9th Int Heat Transfer Conf, 9 , pp. 51–55.
Biswas,  G., and Chattopadhyay,  H., 1992, “Heat Transfer in a Channel With Built-In Wing Type Vortex Generators,” J. Heat Mass Transfer,35(4), pp. 803–814.
Biswas,  G., Torii,  K., Fujii,  D., and Nishino,  K., 1996, “Numerical and Experimental Determination of Flow Structure and Heat Transfer Effects of Longitudinal Vortices in a Channel Flow,” J. Heat Mass Transfer,39(16), pp. 3441–3451.
Fiebig, M., and Mitra, N. K., 1998, Development in Heat Transfer: Computer Simulation in Compact Heat Exchangers, B. Sunden and M. Faghri, eds., Computational Mechanics Publications, 1 , pp. 220–254.
Lau,  S., 1995, “Experimental Study of the Turbulent Flow in a Channel With Periodically Arranged Longitudinal Vortex Generators,” Exp. Therm. Fluid Sci., 14, pp. 255–261.
Fiebig,  M., Valencia,  A., and Mitra,  N. K., 1993, “Wing-Type Vortex Generators for Fin-and-Tube Heat Exchangers,” Exp. Therm. Fluid Sci., 7, pp. 587–595.
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Valencia,  A., Fiebig,  M., and Mitra,  N. K., 1996, “Heat Transfer Enhancement by Longitudinal Vortices in a Fin-Tube Heat Exchanger Element With Flat Tubes,” ASME J. Heat Transfer, 118, pp. 209–211.
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Figures

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Top view of the experimental facility
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Geometry of the channel with mounted embossed-like vortex generators. All dimensions are in millimeters. Pairs of generators are arranged in four lines (streamwise horizontal direction: x) and four columns (transverse vertical direction y).
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Vortex visualization by dye injection, for Re=1000, behind a generator of the first column
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Iso-values (%) of mean vertical velocity component V/Uq×100, for Re=1000 (a,b,c), Re=2000 (d,e,f), and Re=5000 (g,h,i) behind the 2nd column at three streamwise cross sections (Oz,Oy)
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Iso-values (%) of mean longitudinal velocity component U/Uq×100, for Re=1000 (a,b,c), Re=2000 (d,e,f), and Re=5000 (g,h,i) behind the 2nd column at three streamwise cross sections (Oz,Oy)
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Vortex circulation Γ/UqH behind different columns, at d/H=2.4 downstream of each generator
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Vortices core size 2a/H behind different columns, at d/H=2.4 downstream of each generator
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Vortex intensity Γ/UqH downstream of the 2nd column
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Vortex core size 2a/H downstream of the 2nd column
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Vortex maximal tangential velocity downstream of the 2nd column
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Average kinetic energy of the fluctuating motion k/(1/2)Uq2 behind successive generators, at d/H=2.4 downstream of each generator
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Example of power spectral density of the transverse velocity fluctuations v, recorded at x/H=19.1,y/H=−48.1,z/H=−82.4, for Re=2000, with a sampling frequency of 100 Hz
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Iso-values (%) of rms vertical (a) and rms longitudinal (b) velocity components, for Re=2000, behind the 2nd column, at x/H=11.1
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Mean velocity field in the cross section, for Re=1000 (a,b,c), Re=2000 (d,e,f), and Re=5000 (g,h,i) behind the 2nd column at three streamwise cross sections (Oz,Oy)

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