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TECHNICAL BRIEFS

Heat Transfer Enhancement for Turbulent Flow Through Blockages With Round and Elongated Holes in a Rectangular Channel

[+] Author and Article Information
H. S. Ahn, S. W. Lee

Convective Heat and Mass Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

S. C. Lau1

Convective Heat and Mass Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123

1

Corresponding author.

J. Heat Transfer 129(11), 1611-1615 (Mar 08, 2007) (5 pages) doi:10.1115/1.2764091 History: Received June 29, 2006; Revised March 08, 2007

Experiments were conducted to determine the average heat transfer coefficients on three wall segments between blockages with holes in a wide rectangular channel. Eight different configurations of the holes in the blockages—two diameters and four aspect ratios of the holes—were examined. The pressure drops across the blockages were also measured. The results showed that the elongated holes in the blockages in this study enhanced more heat transfer than the round holes, but they also caused larger pressure drops across the blockages.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of test apparatus for this study

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Figure 2

Schematics of blockages with round and elongated holes for this study

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Figure 3

Schematic of top and bottom walls of wide (12:1) rectangular channel with four blockages for this study

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Figure 4

Heat transfer enhancement on wall segments downstream of blockages (numbers along the abscissa are Reynolds numbers)

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Figure 5

Average heat transfer enhancement on wall segments downstream of blockages (numbers along the abscissa are Reynolds numbers)

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Figure 6

Pressure drops across wall segments downstream of blockages relative to that for fully developed turbulent flow through a smooth channel without blockages (numbers along the abscissa are Reynolds numbers)

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Figure 7

Thermal performances of blockages with holes—heat transfer enhancement per unit pumping power relative to that for fully developed flow through a smooth channel (numbers along the abscissa are Reynolds numbers)

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