An experimental study was carried out to investigate the heat transfer and friction characteristics of a fully developed turbulent air flow in a square channel with 45 deg inclined ribs on one, two, or four walls. Either two opposite walls or all four walls in the channel were heated. Tests were performed for Reynolds numbers (Re) ranging from 7600 to 24,900, the pitch to rib height ratio of 8.0, the rib height to channel hydraulic diameter ratio of 0.0667, and the channel aspect ratio of 1.0. The results show that the local Nusselt number and friction factor increase with the number of ribbed walls. With one ribbed wall, the Nusselt numbers on the ribbed side (B) were 50% and 63% greater than those on the adjacent smooth sides (L∕R) and the opposite smooth side (T), respectively. The Nusselt numbers, when the two opposite walls of a four-wall ribbed channel are heated, are found to be 1.49–1.52 times greater than those obtained when all four walls are heated.
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July 2008
Technical Briefs
Heat Transfer and Friction Factor in a Square Channel With One, Two, or Four Inclined Ribbed Walls
Soo Whan Ahn,
Soo Whan Ahn
School of Mechanical and Aerospace Engineering,
Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea; Institute of Marine Industry, Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea
Search for other works by this author on:
Ho Keun Kang,
Ho Keun Kang
School of Mechanical and Aerospace Engineering,
Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea; Institute of Marine Industry, Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea
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Sung Taek Bae,
Sung Taek Bae
Department of Mechanical System Engineering, Graduate School,
Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea
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Dae Hee Lee
Dae Hee Lee
School of Mechanical and Automotive Engineering,
Inje University
, 607 Obang-Dong, Gimhae, Gyeongnam 621-749, Korea
Search for other works by this author on:
Soo Whan Ahn
School of Mechanical and Aerospace Engineering,
Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea; Institute of Marine Industry, Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea
Ho Keun Kang
School of Mechanical and Aerospace Engineering,
Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea; Institute of Marine Industry, Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea
Sung Taek Bae
Department of Mechanical System Engineering, Graduate School,
Gyeongsang National University
, Tongyong, Gyeongnam 650-160, Korea
Dae Hee Lee
School of Mechanical and Automotive Engineering,
Inje University
, 607 Obang-Dong, Gimhae, Gyeongnam 621-749, KoreaJ. Turbomach. Jul 2008, 130(3): 034501 (5 pages)
Published Online: May 2, 2008
Article history
Received:
July 6, 2006
Revised:
February 13, 2007
Published:
May 2, 2008
Citation
Ahn, S. W., Kang, H. K., Bae, S. T., and Lee, D. H. (May 2, 2008). "Heat Transfer and Friction Factor in a Square Channel With One, Two, or Four Inclined Ribbed Walls." ASME. J. Turbomach. July 2008; 130(3): 034501. https://doi.org/10.1115/1.2775488
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