The flow characteristics and the heat transfer properties of the rectangular channels with staggered transverse ribs on two opposite walls are experimentally studied. The rib height to channel height ratio ranges from 0.15 to 0.61 (rib height to channel hydraulic diameter ratio from 0.09 to 0.38). The pitch to rib height ratio covers from 2.5 to 26. The aspect ratio of the rectangular channel is 4. The flow characteristics are studied in a water channel, while the heat transfer experiments are performed in a wind tunnel. Particle image velocimetry (PIV) is employed to obtain the quantitative flow field characteristics. Fine-wire thermocouples imbedded near the inner surface of the bottom channel wall are used to measure the temperature distributions of the wall and to calculate the local and average Nusselt numbers. Using the PIV measured streamline patterns, various characteristic flow modes, thru flow, oscillating flow, and cell flow, are identified in different regimes of the domain of the rib height to channel height ratio and pitch to rib height ratio. The vorticity, turbulence intensity, and wall shear stress of the cell flow are found to be particularly larger than those of other characteristic flow modes. The measured local and average Nusselt numbers of the cell flow are also particularly higher than those of other characteristic flow modes. The distinctive flow properties are responsible for the drastic increase of the heat transfer due to the enhancement of the momentum, heat, and mass exchanges within the flow field induced by the large values of the vorticity and turbulence intensity. Although the thru flow mode is conventionally used in the ribbed channel for industrial application, the cell flow could become the choice if the heat transfer rate, instead of the pressure loss, is the primary concern.
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e-mail: rfhuang@mail.ntust.edu.tw
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December 2007
This article was originally published in
Journal of Heat Transfer
Technical Briefs
Flow and Heat Transfer Characteristics in Rectangular Channels With Staggered Transverse Ribs on Two Opposite Walls
Rong Fung Huang,
Rong Fung Huang
Department of Mechanical Engineering,
e-mail: rfhuang@mail.ntust.edu.tw
National Taiwan University of Science and Technology
, 43 Keelung Road, Section 4, 106 Taipei, Taiwan, ROC
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Shyy Woei Chang,
Shyy Woei Chang
Department of Marine Engineering,
National Kaohsiung Marine University
, 142 Hai-Chuan Road, Nan-Tzu District, 811 Kaohsiung, Taiwan, ROC
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Kun-Hung Chen
Kun-Hung Chen
Department of Mechanical Engineering,
National Taiwan University of Science and Technology
, 43 Keelung Road, Section 4, 106 Taipei, Taiwan, ROC
Search for other works by this author on:
Rong Fung Huang
Department of Mechanical Engineering,
National Taiwan University of Science and Technology
, 43 Keelung Road, Section 4, 106 Taipei, Taiwan, ROCe-mail: rfhuang@mail.ntust.edu.tw
Shyy Woei Chang
Department of Marine Engineering,
National Kaohsiung Marine University
, 142 Hai-Chuan Road, Nan-Tzu District, 811 Kaohsiung, Taiwan, ROC
Kun-Hung Chen
Department of Mechanical Engineering,
National Taiwan University of Science and Technology
, 43 Keelung Road, Section 4, 106 Taipei, Taiwan, ROCJ. Heat Transfer. Dec 2007, 129(12): 1732-1736 (5 pages)
Published Online: April 6, 2007
Article history
Received:
November 18, 2006
Revised:
April 6, 2007
Citation
Fung Huang, R., Woei Chang, S., and Chen, K. (April 6, 2007). "Flow and Heat Transfer Characteristics in Rectangular Channels With Staggered Transverse Ribs on Two Opposite Walls." ASME. J. Heat Transfer. December 2007; 129(12): 1732–1736. https://doi.org/10.1115/1.2768101
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