Experimental and Numerical Investigation of Flow and Heat Transfer Characteristics Using Jet Impinging on Optimized Rectangular Finned Heat Sinks

Abstract

Potential application of the impingement jet technique in various situations has gained the attention of researchers in recent times for its large heat transfer rate characteristics. In the present study, the heat transfer and flow characteristics of a heat sink having rectangular fins and being optimized for impingement jet by making use of the Taguchi experimental L18(21*37) design method were analyzed both experimentally and numerically. The heat transfer and flow characteristics of a heat sink with rectangular fins and optimized for impingement jet cooling were analyzed both experimentally and numerically by making use of six different jet speeds (4, 5, 6, 7, 8, and 9 m/s), four different nozzle diameters (D = 40, 50, 63, and 75 mm), and three different dimensionless nozzle-to-target distances (h/d = 1, 2, and 3). The changes in average target surface temperature were measured and the Nusselt numbers were calculated, as well as the changes in the Reynolds number. These results were also simulated numerically by making use of the Ansys Fluent software. To compare the results to the experimental research data, the k–ε realizable turbulence model was selected to be the most suitable one. Experimental and numerical results were compared using the Nu–Re diagrams. The numerical results show that the average Nusselt number is directly proportional to the increase in the Reynolds number. The Nusselt number was also found to decrease with increase in the distance between the nozzle and the heat sink. The peak value of the local Nusselt number was found to be the stagnation point. It was determined that experimental and numerical findings were consistent. © 2022 by Begell House, Inc.