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International Heat Transfer Conference 5

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)


C. K. Chan
Chemical, Nuclear, and Thermal Engineering Department, School of Engineering and Applied Science, University of California, Los Angeles

Chang-Lin Tien
NEC Distinguished Professor of Engineering, University of California, Berkeley, California

DOI: 10.1615/IHTC5.3380
pages 72-74


This paper is concerned with the total heat transfer by simultaneous conduction and radiation through a packed bed of microspheres. The porous medium is considered to be continuous having effective thermophysical properties such as conductance, scattering and absorption parameters. The analysis involves the solution of the two-flux equations together with the thermophysical properties and the energy equation for simultaneous conduction and radiation. The solution is then used to predict the thermal effectiveness of microsphere insulation. For various system parameters and particle properties, the predictions compare favorably with measured values.

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