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

Igor V. Miroshnichenko, Mikhail A. Sheremet and Abdulmajeed A. Mohamad
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Igor V. Miroshnichenko: Regional Scientific and Educational Mathematical Centre, Tomsk State University, 634050 Tomsk, Russia
Mikhail A. Sheremet: Laboratory on Convective Heat and Mass Transfer, Tomsk State University, 634050 Tomsk, Russia
Abdulmajeed A. Mohamad: Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, CEERE, The University of Calgary, Calgary, AB T2N 1N4, Canada

Energies, 2019, vol. 12, issue 6, 1-14

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.

Keywords: convection; local heat-generating element; surface radiation; Ostrogradsky number; finite difference method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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