THE EFFECT OF FIN GEOMETRIES ON HEAT SINK UNDER NATURAL CONVECTION

In recent years, effective thermal management has become one of the most serious challenges in many technologies. Fins are surfaces that extend from an object to increase the rate of heat transfer to (or) from the environment by increasing convection. Normally flat rectangular fins are used, but to enhance the heat transfer, five different aluminum fin geometries along with a cylindrical heat sink were chosen. The first fin was flat fin, second one with rectangular edges, third one with elliptical perforations besides the rectangular edge, fourth one with triangular edges, last one with elliptical perforations besides the triangular edge. The main objective of this work is to study which fin geometry can give better heat transfer rate. The predictive results from this study are triangular edges with elliptical perforation was more effective to dissipate heat especially when located near the heat source. The thermal efficiency of the proposed fin geometry in a very good acceptable percent range for all the studied fin cases and it is above 90%. Among all fin geometries fin with triangular edge & perforations has found to be more efficient with 93.77%. The thermal effectiveness of the proposed fin geometry in a very good acceptable percent range for all the studied fin cases and it is more than 1. Among all fin geometries fin with triangular edge & perforations has found to be more effective with an effectiveness of 1.43.