An experimental and numerical study was conducted to determine the thermal performance of V-shaped ribs in a rectangular channel with an aspect ratio of 2:1. Local heat transfer coefficients were measured using the steady state thermochromic liquid crystal technique. Periodic pressure losses were obtained with pressure taps along the smooth channel sidewall. Reynolds numbers from 95,000 to 500,000 were investigated with V-shaped ribs located on one side or on both sides of the test channel. The rib height-to-hydraulic diameter ratios were 0.0625 and 0.02, and the rib pitch-to-height ratio was 10. In addition, all test cases were investigated numerically. The commercial software FLUENT™ was used with a two-layer turbulence model. Numerically and experimentally obtained data were compared. It was determined that the heat transfer enhancement based on the heat transfer of a smooth wall levels off for Reynolds numbers over 200,000. The introduction of a second ribbed sidewall slightly increased the heat transfer enhancement whereas the pressure penalty was approximately doubled. Diminishing the rib height at high Reynolds numbers had the disadvantage of a slightly decreased heat transfer enhancement, but benefits in a significantly reduced pressure loss. At high Reynolds numbers small-scale ribs in a one-sided ribbed channel were shown to have the best thermal performance.
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e-mail: itlr@itlr.uni-stuttgart.de
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October 2007
Research Papers
An Experimental and Numerical Study of Heat Transfer and Pressure Loss in a Rectangular Channel With V-Shaped Ribs
Michael Maurer,
Michael Maurer
Institute of Aerospace Thermodynamics,
e-mail: itlr@itlr.uni-stuttgart.de
University of Stuttgart
, Stuttgart, D-70569 Germany
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Jens von Wolfersdorf,
Jens von Wolfersdorf
Institute of Aerospace Thermodynamics,
e-mail: itlr@itlr.uni-stuttgart.de
University of Stuttgart
, Stuttgart, D-70569 Germany
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Michael Gritsch
e-mail: michael.gritsch@power.alstom.com
Michael Gritsch
ALSTOM (Switzerland) Ltd.
, Technology Center TTC-TT, Birr, CH-5242 Switzerland
Search for other works by this author on:
Michael Maurer
Institute of Aerospace Thermodynamics,
University of Stuttgart
, Stuttgart, D-70569 Germanye-mail: itlr@itlr.uni-stuttgart.de
Jens von Wolfersdorf
Institute of Aerospace Thermodynamics,
University of Stuttgart
, Stuttgart, D-70569 Germanye-mail: itlr@itlr.uni-stuttgart.de
Michael Gritsch
ALSTOM (Switzerland) Ltd.
, Technology Center TTC-TT, Birr, CH-5242 Switzerlande-mail: michael.gritsch@power.alstom.com
J. Turbomach. Oct 2007, 129(4): 800-808 (9 pages)
Published Online: August 9, 2006
Article history
Received:
July 26, 2006
Revised:
August 9, 2006
Citation
Maurer, M., von Wolfersdorf, J., and Gritsch, M. (August 9, 2006). "An Experimental and Numerical Study of Heat Transfer and Pressure Loss in a Rectangular Channel With V-Shaped Ribs." ASME. J. Turbomach. October 2007; 129(4): 800–808. https://doi.org/10.1115/1.2720507
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