Effect of circular perforated pin fin on heat transfer and fluid flow characteristics of rectangular microchannel heat sink

In the present work, a numerical analysis has been performed to observe the heat transfer and fluid flow characteristics of the perforated pin fin microchannel heat sink. Six equidistant cylindrical pin fins with circular perforation at the center are entrenched at the base wall of the channel. This perforated pin fin can act as an extended surface and enhanced the heat transfer whereas the circular perforation may reduces the pressure drop and also influence the flow characteristics. The analysis has been done for the single-phase flow with Reynolds number ranges between 150 to 350 and the nondimensional diameter(alpha) of circular perforations considered in this study are 0.33, 0.5, 0.67 and 0.83. It is observed that the Nusslet number improves with the smallest perforation that is alpha = 0.33 and decreases as the diameter of perforation increases however the maximum value of overall thermal performance is associated with the perforation size of 0.5.