Thermal analysis with comprehensive treatment of conjugate heat transfer is performed in this study for discrete flush-mounted heat sources in a horizontal channel cooled by air. The numerical model accounts for mixed convection, radiative exchange and two-dimensional conduction in the substrate. The model is first used to simulate available experimental work to demonstrate its accuracy and practical utility. A parametric study is then undertaken to assess the effects of Reynolds number, surface emissivity of walls and heat sources, as well as thickness and thermal conductivity of substrate, on flow field and heat transfer characteristics. It is shown that due to radiative heat transfer, the wall temperatures are brought closer, and the trend of temperature variation along the top wall is significantly altered. Such effects are more pronounced for higher surface emissivity and/or lower Reynolds numbers. The influence of substrate conductivity and thickness is related in that a large value of either substrate conductivity or thickness facilitates redistribution of heat and tends to yield a uniform temperature field in the substrate. For highly conductive or thick substrate, the “hot spot” cools down and may occur in upstream sources. Radiation loss to the ambient increases with substrate conductivity and thickness due to the elevated temperature near the openings, yet the total heat transfer over the bottom surface by convection and radiation remains essentially unaltered.
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December 2011
Research Papers
Conjugate Thermal Analysis of Air-Cooled Discrete Flush-Mounted Heat Sources in a Horizontal Channel
Jing He,
Jing He
Department of Mechanical Science and Engineering,
University of Illinois
, 1206 West Green Street, Urbana, IL 61801
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Liping Liu,
Liping Liu
Department of Mechanical Engineering,
Lawrence Technological University
, 21000 West Ten Mile Road, Southfield, MI 48075
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Anthony M. Jacobi
Anthony M. Jacobi
Department of Mechanical Science and Engineering,
University of Illinois
, 1206 West Green Street, Urbana, IL 61801
Search for other works by this author on:
Jing He
Department of Mechanical Science and Engineering,
University of Illinois
, 1206 West Green Street, Urbana, IL 61801
Liping Liu
Department of Mechanical Engineering,
Lawrence Technological University
, 21000 West Ten Mile Road, Southfield, MI 48075
Anthony M. Jacobi
Department of Mechanical Science and Engineering,
University of Illinois
, 1206 West Green Street, Urbana, IL 61801J. Electron. Packag. Dec 2011, 133(4): 041001 (8 pages)
Published Online: November 17, 2011
Article history
Received:
July 11, 2011
Revised:
September 7, 2011
Online:
November 17, 2011
Published:
November 17, 2011
Citation
He, J., Liu, L., and Jacobi, A. M. (November 17, 2011). "Conjugate Thermal Analysis of Air-Cooled Discrete Flush-Mounted Heat Sources in a Horizontal Channel." ASME. J. Electron. Packag. December 2011; 133(4): 041001. https://doi.org/10.1115/1.4005299
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