Abstract: In this thesis, investigations will be carried out to determine the heat transfer rates in a heat sink by means of varying pitch of the fin with air and helium as the working fluids. Analysis is carried out for heat sink with closed and open enclosure constant wall heat flux and different mass flow rates calculated for Reynolds number 8000, 10000, 12000 and 14000 different pitch 2mm and 4mm. CFD analysis is performed for different cases to determine heat transfer coefficient, pressure drop, mass flow rate and heat transfer rate. Thermal analysis is to determine heat flux and temperature distribution by with different aluminum alloys (aluminum alloy, aluminum alloy 7075). 3D modeling is done in PRO-Engineer. Analysis is performed in ANSYS software.

Keywords: Finite element analysis, heat sink, CFD analysis, thermal analysis.