Optimization of Impingement Cooled Heat Sink using Experimental and CFD Simulation Methods

Impingement cooling method utilizes high speed jet(s) to impinge on a high temperature surfaces for cooling or heating. In this study, various heat sink geometrical configurations -Heat sink with no fins, Heat sink with continuous platefins, Heat sink with interrupted plate-fins, Heat sinks with pin-fins -were studied. The studies had been conducted for three jet velocity (2, 4 and 6 m/s) as well as three Z/d ratio of 2, 4 and 6. Numerical simulations for this work had been performed in ANSYS FLUENT with RNG k-ϵ turbulence model to account for the Reynolds Stresses. Experimental studies had been conducted to validate the predictions from the CFD simulations. As high as 25% heat transfer enhancement was observed by employing pin-fins. The ineffectiveness of the plate fins -both continuous and interrupted -for the impingement cooling were attributed to obstruction to the flow path in these geometrical variants. Also, the increase in the pin-fin diameter was resulted heat transfer enhancement.