Heat sinks with rectangular channels are generally used to dissipate heat from electronic components. To confirm munch angling heat dissipation of heat, coolant fluid has to be uniformly distributed among the channels of heat sink. In this research work, fluid flow is simulated computationally by using commercially available CFD software through the heat sink with flaps placed at the inlet of the channels. Major objective of this work is to study the effect of geometry of the flap on the uniformity of flow distribution among the channels. Length and inclination of the flap pivoted to the wall of the channel at its inlet are varied along with inlet flow velocity and flow rates in each of the channels are observed. It is observed that longer flaps with smaller angles and shorter flaps with larger angles result in better distribution of flow
