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Technical Briefs

Heat Transfer and Friction Factor in a Square Channel With One, Two, or Four Inclined Ribbed Walls

[+] Author and Article Information
Soo Whan Ahn, 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, Korea

J. Turbomach 130(3), 034501 (May 02, 2008) (5 pages) doi:10.1115/1.2775488 History: Received July 06, 2006; Revised February 13, 2007; Published May 02, 2008

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 (Pe) of 8.0, the rib height to channel hydraulic diameter ratio (eDh) 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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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Details of the test section

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Figure 2

Local Nusselt number distributions in a channel with a ribbed bottom wall

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Figure 3

Local Nusselt number distributions in a channel with two opposite ribbed walls

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Figure 4

Local Nusselt number distributions in a channel with four ribbed walls

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Figure 5

Nusselt number variation for different ribbed wall conditions and Reynolds numbers

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Figure 6

Comparison of the heat transfer performance under a constant pumping power for different ribbed wall conditions

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