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DOI: 10.1615/ICHMT.1995.RadTransfProc.500

Alejo Sancheza A.
Escuela de Ingeniería Mecanica, Universidad de los Andes, Mérida, Edo. Mérida 5101, Venezuela

Rafael Rosales
Escuela de Ingeniería Mecanica, Universidad de los Andes, Mérida, Edo. Mérida 5101, Venezuela

Iris Jimenez de P.
Escuela de Ingeniería Mecanica, Universidad de los Andes, Mérida, Edo. Mérida 5101, Venezuela

Antonio Campo
Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, Texas 78249, USA


Convective cooling has received, so far, more attention than any other cooling mechanism that could be associated with the problem of electronic packaging. This is particularly interesting since the few publications where radiation has been considered show, consistently, that radiative cooling could account for 30-50 % of the total heat transfer.
In the present paper, the Discrete Ordinates method is combined with a control volume approach to simulate the thermal performance of several arrays of electronic components in situations selected to emphasize the importance of the radiation effect. The simulations include radiation combined with pure natural and pure forced convection, as well as radiation combined with mixed convection. In particular, it is demonstrated that in some applications radiation cooling can be orders of magnitude higher than convection cooling. Simultaneously, it is demonstrated that the maximum temperature of electronic components can not be correctly estimated if radiation effects are not accounted for.

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