This paper describes an experimental study of heat transfer in a radially rotating square duct with two opposite walls roughened by staggered ribs. Air coolant flows radially outward in the test channel with experiments to be undertaken that match the actual engine conditions. Laboratory-scale heat transfer measurements along centerlines of two rib-roughened surfaces are performed with Reynolds number (Re), rotation number (Ro), and density ratio in the ranges of 7500–15,000, 0–1.8, and 0.076–0.294. The experimental rig permits the heat transfer study with the rotation number considerably higher than those studied in other researches to date. The rotational influences on cooling performance of the rib-roughened channel due to Coriolis forces and rotating buoyancy are studied. A selection of experimental data illustrates the individual and interactive impacts of Re, Ro, and buoyancy number on local heat transfer. A number of experimental-based observations reveal that the Coriolis force and rotating buoyancy interact to modify heat transfer even if the rib induced secondary flows persist in the rotating channel. Local heat transfer ratios between rotating and static channels along the centerlines of stable and unstable rib-roughened surfaces with Ro varying from 0.1 to 1.8 are in the ranges of 0.6–1.6 and 1–2.2, respectively. Empirical correlations for periodic flow regions are developed to permit the evaluation of interactive and individual effects of ribflows, convective inertial force, Coriolis force, and rotating buoyancy on heat transfer.
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Heat Transfer in a Radially Rotating Square-Sectioned Duct With Two Opposite Walls Roughened by Staggered Ribs at High Rotation Numbers
Shyy Woei Chang,
Shyy Woei Chang
Professor
Thermal Fluids Laboratory,
e-mail: swchang@mail.nkmu.edu.tw
National Kaohsiung Marine University
, No. 142 Haijhuan Road, Nanzih District, Kaohsiung City 81143, Taiwan, Republic of China
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Tong-Minn Liou,
Tong-Minn Liou
Professor
Department of Power Mechanical Engineering,
National Tsing Hua University
, 300 Hsinchu, Taiwan, Republic of China
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Jui-Hung Hung,
Jui-Hung Hung
Ms Student
Department of Power Mechanical Engineering,
National Tsing Hua University
, 300 Hsinchu, Taiwan, Republic of China
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Wen-Hsien Yeh
Wen-Hsien Yeh
Ms Student
Department of Marine Engineering,
National Kaohsiung Marine University
, No. 142 Haijhuan Road, Nanzih District, Kaohsiung City 81143, Taiwan, Republic of China
Search for other works by this author on:
Shyy Woei Chang
Professor
Thermal Fluids Laboratory,
National Kaohsiung Marine University
, No. 142 Haijhuan Road, Nanzih District, Kaohsiung City 81143, Taiwan, Republic of Chinae-mail: swchang@mail.nkmu.edu.tw
Tong-Minn Liou
Professor
Department of Power Mechanical Engineering,
National Tsing Hua University
, 300 Hsinchu, Taiwan, Republic of China
Jui-Hung Hung
Ms Student
Department of Power Mechanical Engineering,
National Tsing Hua University
, 300 Hsinchu, Taiwan, Republic of China
Wen-Hsien Yeh
Ms Student
Department of Marine Engineering,
National Kaohsiung Marine University
, No. 142 Haijhuan Road, Nanzih District, Kaohsiung City 81143, Taiwan, Republic of ChinaJ. Heat Transfer. Feb 2007, 129(2): 188-199 (12 pages)
Published Online: May 2, 2006
Article history
Received:
January 3, 2006
Revised:
May 2, 2006
Citation
Chang, S. W., Liou, T., Hung, J., and Yeh, W. (May 2, 2006). "Heat Transfer in a Radially Rotating Square-Sectioned Duct With Two Opposite Walls Roughened by Staggered Ribs at High Rotation Numbers." ASME. J. Heat Transfer. February 2007; 129(2): 188–199. https://doi.org/10.1115/1.2409988
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