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TECHNICAL PAPERS: Heat Exchangers

Local Heat Transfer and Pressure Drop for Finned-Tube Heat Exchangers Using Oval Tubes and Vortex Generators

[+] Author and Article Information
James E. O’Brien, Manohar S. Sohal, Philip C. Wallstedt

Idaho National Engineering and Environmental Laboratory, Idaho Falls, Idaho 83415

J. Heat Transfer 126(5), 826-835 (Nov 16, 2004) (10 pages) doi:10.1115/1.1795239 History: Received November 07, 2003; Revised May 11, 2004; Online November 16, 2004
Copyright © 2004 by ASME
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References

O’Brien, J. E., and Sohal, M. S., 2000, “Local Heat Transfer for Finned-Tube Heat Exchangers Using Oval Tubes,” Proc. of 2000 ASME National Heat Transfer Conference, Pittsburgh, Paper No. NHTC2000-12093, CD-ROM, ASME, New York.
O’Brien, J. E., and Sohal, M. S., 2000, “Heat Transfer Enhancement for Finned-tube Heat Exchangers with Winglets,” Proc. of 2000 ASME Int. Congress and Exposition, Orlando, HTD-Vol. 365/PID-Vol. 4, ASME, New York, pp. 137–146.
Foust, T. D., O’Brien, J. E., and Sohal, M. S., 2001, “Numerical and Experimental Methods for Heat Transfer Enhancement for Finned-Tube Heat Exchangers with Oval Tubes,” 2001 ASME National Heat Transfer Conference, Anaheim, Paper No. NHTC01-12363.
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. 295–309.
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Fiebig,  M., Valencia,  A., and Mitra,  N. K., 1994, “Local Heat Transfer and Flow Losses in Fin-Tube Heat Exchanger with Vortex Generators: A Comparison of Round and Flat Tubes,” Exp. Therm. Fluid Sci., 8(1), pp. 35–45.
Wang,  L. B., Ke,  F., Gao,  S. D., and Mei,  Y. G., 2002, “Local and Average Characteristics of Heat/Mass Transfer Over Flat Tube Bank Fin With Four Vortex Generators per Tube,” ASME J. Heat Transfer, 124, pp. 546–552.
Chen,  Y., Fiebig,  M., and Mitra,  N. K., 2000, “Heat Transfer Enhancement of Finned Oval Tubes with Staggered Punched Longitudinal Vortex Generators,” Int. J. Heat Mass Transfer, 43, pp. 417–435.
Chen,  Y., Fiebig,  M., and Mitra,  N. K., 1998, “Heat Transfer Enhancement of a Finned Oval Tube With Punched Longitudinal Vortex Generators In-line,” Int. J. Heat Mass Transfer, 41, pp. 4151–4166.
Tiggelbeck,  S., Mitra,  N. K., and Fiebig,  M., 1993, “Experimental Investigations of Heat Transfer Enhancement and Flow Losses in a Channel with Double Rows of Longitudinal Vortex Generators,” Int. J. Heat Mass Transfer, 36(9), pp. 2327–2337.
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Lin,  C. N., and Jang,  J. Y., 2002, “Conjugate Heat Transfer and Fluid Flow Analysis in Fin-Tube Heat Exchangers with Wave-Type Vortex Generators,” J. Enhanced Heat Transfer, 9(3–4), pp. 123–136.
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Figures

Grahic Jump Location
Winglet locations and geometry
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Pressure-drop test section core
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Experimental uncertainties
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Local fin surface heat transfer coefficients for an oval tube plus a single winglet pair
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Local fin-surface heat transfer distributions for flow around an elliptical tube with two pairs of delta winglets in a staggered configuration
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Mean fin-surface Nusselt numbers for seven flow configurations, based on local heat transfer results
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Friction factors measured for six flow configurations, steady-state and blow-down results

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