The discrete-element model for flows over rough surfaces considers the heat transferred from a rough surface to be the sum of the heat convected from the flat surface and the heat convected from the individual roughness elements to the fluid. In previous discrete-element model developments, heat transfer experiments were performed using metallic or high-thermal conductivity roughness elements. Many engineering applications, however, exhibit roughness with low thermal conductivities. In the present study, the discrete-element model is adapted to consider the effects of finite thermal conductivity of roughness elements on turbulent convective heat transfer. Initially, the boundary-layer equations are solved while the fin equation is simultaneously integrated so that the full conjugate heat transfer problem is solved. However, a simpler approach using a fin efficiency is also investigated. The results of the conjugate analysis and the simpler fin efficiency analysis are compared to experimental measurements for turbulent flows over ordered cone surfaces. Possibilities for extending the fin efficiency method to randomly rough surfaces and the experimental measurements required are discussed.
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April 2011
Research Papers
The Effect of Element Thermal Conductivity on Turbulent Convective Heat Transfer From Rough Surfaces
Stephen T. McClain,
Stephen T. McClain
Assistant Professor
Department of Mechanical Engineering,
Baylor University
, One Bear Place #97356, Waco, TX 76798
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B. Keith Hodge,
B. Keith Hodge
Professor
Department of Mechanical Engineering,
Mississippi State University
, P.O. Box ME, Mississippi State, MS 39762
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Jeffrey P. Bons
Jeffrey P. Bons
Professor
Department of Aerospace Engineering,
Ohio State University
, 2300 West Case Road, Columbus, OH 43210
Search for other works by this author on:
Stephen T. McClain
Assistant Professor
Department of Mechanical Engineering,
Baylor University
, One Bear Place #97356, Waco, TX 76798
B. Keith Hodge
Professor
Department of Mechanical Engineering,
Mississippi State University
, P.O. Box ME, Mississippi State, MS 39762
Jeffrey P. Bons
Professor
Department of Aerospace Engineering,
Ohio State University
, 2300 West Case Road, Columbus, OH 43210J. Turbomach. Apr 2011, 133(2): 021024 (10 pages)
Published Online: October 26, 2010
Article history
Received:
July 28, 2009
Revised:
October 8, 2009
Online:
October 26, 2010
Published:
October 26, 2010
Citation
McClain, S. T., Hodge, B. K., and Bons, J. P. (October 26, 2010). "The Effect of Element Thermal Conductivity on Turbulent Convective Heat Transfer From Rough Surfaces." ASME. J. Turbomach. April 2011; 133(2): 021024. https://doi.org/10.1115/1.4001191
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