In the power electronics sector, silicon carbide devices are operational at high junction and case temperatures. Drastic reduction in the size of electronic components including heat sink has been achieved by using silicon carbide rather than silicon. Depending upon the application, the challenges in thermal management can be addressed, preferably passive cooling. If electronic components and its casing have higher operating temperatures, the analysis of natural convection in power electronics is more important. Hence, the present study elucidates the influence of macro-rough surface on natural convection. In this study, a square enclosure with and without macro-roughness have been modelled by maintaining top and bottom walls as adiabatic. The parameters varied are Rayleigh number, number of roughness elements and its thickness. The fluid flow and heat transfer characteristics have been explained with the help of velocity and temperature contours. From the results obtained, we have concluded that the increase in roughness elements and its thickness have reduced convection near the roughness elements.
Thermal management of equipment is a very crucial step for optimum operation. This study is aimed at modifying the shape of traditionally circular electronic components to enhance their thermal-hydraulic performance. The frontal portions have been replaced with different profiles of conic sections such as parabola and hyperbola to understand the influence of frontal modification on fluid dynamics and heat transfer. The study has been carried out for confinement of 4d to mimic the confined fluid environment as in electronic chambers and the Reynolds numbers considered range from 60 to 500. The numerically simulated data were postprocessed and elucidated with the help of contour plots, various drag coefficients, total pressure drop, Strouhal number, and Nusselt number. The results claim that hyperbolic front with rear segment offers the best heat transfer with an improvement of 5.78% as compared to circular components, whereas the parabolic front has the best thermal-hydraulic performance. Parabolic profile reduces drag by 2.66% and improves heat transfer by 4.14%.
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