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Energies 2019, 12(6), 980; https://doi.org/10.3390/en12060980

The Influence of Surface Radiation on the Passive Cooling of a Heat-Generating Element

1
Regional Scientific and Educational Mathematical Centre, Tomsk State University, 634050 Tomsk, Russia
2
Laboratory on Convective Heat and Mass Transfer, Tomsk State University, 634050 Tomsk, Russia
3
Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, CEERE, The University of Calgary, Calgary, AB T2N 1N4, Canada
*
Author to whom correspondence should be addressed.
Received: 21 February 2019 / Revised: 6 March 2019 / Accepted: 9 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Numerical Simulation of Convective-Radiative Heat Transfer)
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Abstract

Low-power electronic devices are suitably cooled by thermogravitational convection and radiation. The use of modern methods of computational mechanics makes it possible to develop efficient passive cooling systems. The present work deals with the numerical study of radiative-convective heat transfer in enclosure with a heat-generating source such as an electronic chip. The governing unsteady Reynolds-averaged Navier–Stokes (URANS) equations were solved using the finite difference method. Numerical results for the stream function–vorticity formulation are shown in the form of isotherm and streamline plots and average Nusselt numbers. The influence of the relevant parameters such as the Ostrogradsky number, surface emissivity, and the Rayleigh number on fluid flow characteristics and thermal transmission are investigated in detail. The comparative assessment clearly emphasizes the effect of surface radiation on the overall energy balance and leads to change the mean temperature inside the heat generating element. The results of the present study can be applied to the design of passive cooling systems. View Full-Text
Keywords: convection; local heat-generating element; surface radiation; Ostrogradsky number; finite difference method convection; local heat-generating element; surface radiation; Ostrogradsky number; finite difference method
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Miroshnichenko, I.V.; Sheremet, M.A.; Mohamad, A.A. The Influence of Surface Radiation on the Passive Cooling of a Heat-Generating Element. Energies 2019, 12, 980.

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