Journal of Enhanced Heat Transfer Theory and Application in High Performance Heat and Mass Transfer

ISSN for PRINT: 1065-5131

For Online Access

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2006, Volume13

Issue 1

98 pages

DOI: 10.1615/JEnhHeatTransf.v13.i1

Issue price - $148.00

Lester D. Sherrow
Gas Technology Institute, Des Plaines, Illinois

Phillip M. Ligrani
Convective Heat Transfer Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah 84112-9208

Yaroslav Chudnovsky
Gas Technology Institute, End Use Solutions/Process Heating, 1700 South Mount Prospect Road, Des Plaines, IL 60018, U.S.A.

Alexander P. Kozlov
Gas Technology Institute, Des Plaines, Illinois

Experimental results which show the effects of adding spherical-indentation dimples to the exterior surfaces of tubes in a cross-flow heat exchanger are presented. This exchanger contains four streamwise rows of tubes which are staggered with respect to each other. Either shallow or deep dimples are located on the exterior tube surfaces. The tubes are surrounded by air and hot water is used inside the tubes. Air-side Reynolds numbers range from 10,500 to 12,800, and water-side Reynolds numbers range from 3460 to 6300. The deep dimples produce significant heat transfer augmentations (compared to tubes with smooth exterior surfaces) for tubes located in the tube row, which is farthest upstream. The shallow dimples produce significant heat transfer augmentations on the tubes, which are located in the first, third, and fourth rows of the tube bundle. This is due to thermal augmentations produced by the vortices which are shed from individual dimples. In some cases, these augmentations are enhanced by the relatively high advection speeds and absence of wake-mixing for the tube row which is located farthest upstream.

DOI: 10.1615/JEnhHeatTransf.v13.i1.10 Download article, 1-16 pages

Article price - $35.00

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