In this paper, the effect of rib spacing on heat transfer in a rotating two-passage channel (aspect ratio, AR = 2:1) at orientation angle of 135 deg was studied. Parallel ribs were applied’ on leading and trailing walls of the rotating channel at the flow angle of 45 deg. The rib-height-to-hydraulic diameter ratio (e/Dh) was 0.098. The rib-pitch-to-rib-height (P/e) ratios studied were 5, 7.5, and 10. For each rib spacing, tests were taken at five Reynolds numbers from 10,000 to 40,000, and for each Reynolds number, experiments were conducted at four rotational speeds up to 400 rpm. Results show that the heat transfer enhancement increases with decreasing P/e from 10 to 5 under nonrotation conditions. However, the effect of rotation on the heat transfer enhancement remains about the same for varying P/e from 10 to 5. Correlations of Nusselt number ratio (Nu/Nus) to rotation number (Ro) or local buoyancy parameter (Box) are existent on all surfaces (leading, trailing, inner and outer walls, and tip cap region) in the two-passage 2:1 aspect ratio channel.
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e-mail: jc-han@tamu.edu
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September 2012
This article was originally published in
Journal of Heat Transfer
Heat Transfer Enhancement
Effect of Rib Spacing on Heat Transfer in a Two Pass Rectangular Channel (AR = 2:1) at High Rotation Numbers
Je-Chin Han,
e-mail: jc-han@tamu.edu
Je-Chin Han
Department of Mechanical Engineering, Texas A&M University
, College Station, TX 77843-3123
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Michael Huh
Michael Huh
Search for other works by this author on:
Je-Chin Han
Department of Mechanical Engineering, Texas A&M University
, College Station, TX 77843-3123e-mail: jc-han@tamu.edu
Michael Huh
J. Heat Transfer. Sep 2012, 134(9): 091901 (9 pages)
Published Online: July 9, 2012
Article history
Received:
February 19, 2012
Revised:
February 20, 2012
Online:
July 9, 2012
Published:
July 9, 2012
Citation
Lei, J., Han, J., and Huh, M. (July 9, 2012). "Effect of Rib Spacing on Heat Transfer in a Two Pass Rectangular Channel (AR = 2:1) at High Rotation Numbers." ASME. J. Heat Transfer. September 2012; 134(9): 091901. https://doi.org/10.1115/1.4006298
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