The influence of arrangement and length of discrete ribs on heat/mass transfer and friction loss is investigated. Mass transfer experiments are conducted to obtain the detailed local heat/mass transfer information on the ribbed wall. The aspect ratio (width/height) of the duct is 2.04 and the rib height is one tenth of the duct height, such that the ratio of the rib height to hydraulic diameter is 0.0743. The ratio of rib-to-rib distance to rib height is 10. The discrete ribs were made by dividing each continuous rib into two, three, or five pieces, which were attached periodically to the top and bottom walls of the duct with a parallel orientation. The combined effects of rib angle and length of the discrete ribs on heat/mass transfer are considered for the rib angles (α) of 90 and 45 deg. As the number of the discrete ribs increases, the uniformity of the heat/mass transfer distributions increases. For the heat/mass transfer enhancement with the discrete ribs is remarkable, while the heat/mass transfer performances are slightly higher than that of the transverse continuous ribs due to the accompanied high friction loss penalty. For the average heat/mass transfer coefficients and the heat/mass transfer performances decrease slightly with the discrete ribs compared to the case of the angled continuous ribs.[S0889-504X(00)00103-3]
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e-mail: hhcho@yonsei.ac.kr
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July 2000
Technical Papers
Local Heat/Mass Transfer Measurements in a Rectangular Duct With Discrete Ribs
H. H. Cho,
e-mail: hhcho@yonsei.ac.kr
H. H. Cho
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
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S. J. Wu,
S. J. Wu
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
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H. J. Kwon
H. J. Kwon
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
Search for other works by this author on:
H. H. Cho
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
e-mail: hhcho@yonsei.ac.kr
S. J. Wu
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
H. J. Kwon
Department of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea
Contributed by the International Gas Turbine Institute and presented at the 44th International Gas Turbine and Aeroengine Congress and Exhibition, Indianapolis, Indiana, June 7–10, 1999. Manuscript received by the International Gas Turbine Institute February 1999. Paper No. 99-GT-121. Review Chair: D. C. Wisler.
J. Turbomach. Jul 2000, 122(3): 579-586 (8 pages)
Published Online: February 1, 1999
Article history
Received:
February 1, 1999
Citation
Cho, H. H., Wu , S. J., and Kwon, H. J. (February 1, 1999). "Local Heat/Mass Transfer Measurements in a Rectangular Duct With Discrete Ribs ." ASME. J. Turbomach. July 2000; 122(3): 579–586. https://doi.org/10.1115/1.1303049
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