Experimental and Numerical Comparison of Heat and Flow Characteristics of Concave Heat Sink Using Multi Nozzle Impingement Air Jet

<span style="color: rgb(17, 17, 17); font-family: Poppins; font-size: 14px;">The use of impinging jet cooling applications is increasing every day with the aim of controlling heat transfer. For the removal of high heat from large surfaces, impinging jet systems provide benefits in terms of both cost and efficiency. Studies on impinging jets, which have wide applications in the industry, have attracted attention with the increase in the number of research conducted in recent years. This study examines the heat and flow parameters of a concave heat sink multi-nozzle jet impingement heat transfer. For the analysis of concave heat sinks, three different nozzle diameters (D=25,32,40 mm), three different ratios of the nozzle-to-heat sink distance (H/D=6,7,8), and five different jet velocity values ranging from 5-9 ms-1 were used. As a result of the study, experimental and numerical results were compared to examine how nozzle diameter, dimensionless distance, and jet velocity affect heat transfer characteristics. In the steady state conditions, Nusselt numbers were calculated by measuring the average target surface temperature, and changes in the Reynolds number were also determined. The experiments were also simulated numerically using Ansys Fluent software. The most suitable model, k–ε realizable turbulence model, has been used to compare the numerical results with experimental data. Experimental and numerical results were compared using the Nu–Re diagrams. When comparing the numerical and experimental results, it was discovered that the increase in Reynolds number and nozzle diameter was directly proportional to the average Nusselt number. It has been observed that as dimensionless nozzle distance increases, the Nusselt number decreases. It has been concluded that experimental and numerical data are consistent.</span>