Effect of Adding Fillet to Protruded Rectangular Rib in a Microchannel Heat Sink Subject to Jet Impingement Cooling

Microchannel heat sinks (MCHS) subjected to jet impinging have been proven to be very efficient in dissipating heat energy. Many researchers have introduced surface augmentation on the heat sink for improving the cooling efficiency. The present research explores the effects of height and fillet radius of protruded rib on the thermal performance of a microchannel heat sink subjected to slot-jet impingement. A 3D conjugate heat transfer model coupled with the k-ω Shear Stress Transport turbulence closure is developed to investigate the geometrical effects of protruded ribs on the heat transfer capabilities of the hybrid cooling module. The model is validated. The MCHS with protruded rib added with fillet radius show significant increase in the average Nusselt number and better temperature uniformity as compared to the case without fillet radius. In addition, the pressure drop decreases when shorter protruded rib is used in combination with the fillet.