**ABSTRACT **

Electronic heat sinks are made of convex and concave parabolic fins due to their light weights which is an important factor in the design of the medical devices. The actual design of these fins depends on the proper analysis of the temperature distribution and the heat transfer in the extended surfaces. Therefore, the present work focuses on the thermal analysis of convective-radiative porous convex and concave fins using finite element method. The numerical analysis depicts that the thermal responses of the of the two parabolic fins increase as the surface emissivity constant, power index of heat coefficient, porosity and ambient temperature increase. Also, the effects of the materials used for the constructions of the heat sink fins were investigated and discussed. Among the materials (copper, aluminium, silicon nitride and stainless steel) considered, copper porous fin has the highest values of temperature distribution while stainless steel has the least temperature distribution. The present results will help in the design of electronic medical heat sink fins operating in a high temperature. It will also assist the thermal systems designers in developing thermal systems with reduced device package size and weight as well as relatively low energy consumption and noise.

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