Experiments were conducted in a rotating two-pass cooling channel with an aspect ratio of 2:1 . Results for two surface conditions are presented: smooth and one ribbed configurations. For the ribbed channel, the leading and trailing walls are roughened with ribs and are placed at an angle to the mainstream flow. For each surface condition, two angles of rotation were studied. For each angle of rotation, five Reynolds numbers were considered. At each Reynolds number, five rotational speeds were considered. The maximum rotation number and buoyancy parameter reached were 0.45 and 0.85, respectively. Results showed that rotation effects are minimal in ribbed channels, at both angles of rotation, due to the strong interaction of rib and Coriolis induced vortices. In the smooth case, the channel orientation proved to be important and a beneficial heat transfer increase on the leading surface in the first pass (radially outward flow) was observed at high rotation numbers. The correlations developed in this study for predicting heat transfer enhancement due to rotation using the buoyancy parameter showed markedly good agreement with experimental data . Finally, heat transfer under rotating conditions on the tip cap showed to be quite dependent on channel orientation. The maximum tip cap ratio observed was 2.8.
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e-mail: jc-han@tamu.edu
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January 2012
Research Papers
Influence of Channel Orientation on Heat Transfer in a Two-Pass Smooth and Ribbed Rectangular Channel Under Large Rotation Numbers
Michael Huh,
Michael Huh
Department of Mechanical Engineering,
The University of Texas at Tyler
, 3900 University Blvd., Tyler, TX 75701-6699
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Jiang Lei,
Jiang Lei
Department of Mechanical Engineering, Turbine Heat Transfer Laboratory,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
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Je-Chin Han
Je-Chin Han
Department of Mechanical Engineering, Turbine Heat Transfer Laboratory,
e-mail: jc-han@tamu.edu
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
Search for other works by this author on:
Michael Huh
Department of Mechanical Engineering,
The University of Texas at Tyler
, 3900 University Blvd., Tyler, TX 75701-6699
Jiang Lei
Department of Mechanical Engineering, Turbine Heat Transfer Laboratory,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123
Je-Chin Han
Department of Mechanical Engineering, Turbine Heat Transfer Laboratory,
Texas A&M University
, 3123 TAMU, College Station, TX 77843-3123e-mail: jc-han@tamu.edu
J. Turbomach. Jan 2012, 134(1): 011022 (14 pages)
Published Online: June 1, 2011
Article history
Received:
August 1, 2010
Revised:
August 31, 2010
Online:
June 1, 2011
Published:
June 1, 2011
Citation
Huh, M., Lei, J., and Han, J. (June 1, 2011). "Influence of Channel Orientation on Heat Transfer in a Two-Pass Smooth and Ribbed Rectangular Channel Under Large Rotation Numbers." ASME. J. Turbomach. January 2012; 134(1): 011022. https://doi.org/10.1115/1.4003172
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