The detailed distribution of the heat transfer coefficient on rotating smooth and dimpled rectangular channels were measured using the transient liquid crystal technique. The rotating speed of the channel was fixed at 500 rpm and the tested Reynolds number based on the channel hydraulic diameter was 10,000. A stationary surface and two different channel rotating orientations of 90 deg and 120 deg were tested in order to investigate the effects of channel orientation on the distribution of the heat transfer coefficient in smooth and dimpled rotating surfaces. Results show that the heat transfer coefficient on the trailing surface is higher than that on the leading surface. For the 120 deg channel orientation angle cases, a higher heat transfer coefficient was observed near the outer surface. In the dimpled channel, the effect of the Coriolis force induced secondary flow on the heat transfer coefficient was not as significant as that for the smooth channel case.
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Effect of Channel Orientation on the Heat Transfer Coefficient in the Smooth and Dimpled Rotating Rectangular Channels
Jae Su Kwak
e-mail: jskwak@kau.ac.kr
Jae Su Kwak
Mem. ASME
School of Aerospace and Mechanical Engineering
, Korea Aerospace University
, Goyang-city 412-791, Korea
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Jae Su Kwak
Mem. ASME
School of Aerospace and Mechanical Engineering
, Korea Aerospace University
, Goyang-city 412-791, Korea
e-mail: jskwak@kau.ac.kr
J. Heat Transfer. Jun 2012, 134(6): 064504 (5 pages)
Published Online: May 2, 2012
Article history
Received:
January 24, 2011
Revised:
November 11, 2011
Published:
April 30, 2012
Online:
May 2, 2012
Citation
Kim, S., Choi, E. Y., and Kwak, J. S. (May 2, 2012). "Effect of Channel Orientation on the Heat Transfer Coefficient in the Smooth and Dimpled Rotating Rectangular Channels." ASME. J. Heat Transfer. June 2012; 134(6): 064504. https://doi.org/10.1115/1.4006013
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