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

Thanks to the rapid advancement in technology, especially for the systems having high temperatures and high heat fluxes, the interest in studies on impingement jets to improve the cooling efficiency increased in recent years. The current study focuses on determining the optimization of the inclined multijet array to reduce the temperature of electronic devices. In this study, the cooling was performed on the inclined surfaces by making use of impingement multijets via heat sinks consisting of rectangular fins modeled in different geometries and optimum cooling conditions were achieved. In achieving the optimum cooling conditions, the Taguchi method was used since it was thought to offer a reduction in time and costs in industrial applications. In this study, 11 different parameters were examined at three different levels in order to determine the optimum conditions for impingement multijet applications. The Nusselt number was set as the performance characteristic and the L27(311) orthogonal sequence was used as the experiment plan for 11 parameters that were determined. When calculating the Nusselt number by using nozzle diameter, the optimum results were achieved using the following parameters: 40 mm of nozzle diameter, 9 m/s of air velocity, 20 mm of vertical distance between slices, 4444 W/m2 of heat flux, 20 mm of vertical distance between fins, 15 mm of fin width, 30° of fin angle, 15 mm of horizontal distance between slices, 10° of heat sink angle, 20 mm of horizontal distance between fins, and 8 of nozzle diameter/heat sink dimensionless distance ratio. The flat plate and optimum heat sink established using the data obtained were compared under the optimum conditions obtained from the analysis and to the optimum conditions obtained using the finned optimum heat sink and it was determined that, under the optimum conditions, the finned heat sink improved the heat transfer by 28.61% when compared to the flat plate.

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Optimization of the Design Parameters Using the Taguchi Method in Inclined Impingement Multijet Heat Transfer With Rectangular Finned Heat Sink

Karabey

Arvasi

2023

Heat Trans Res

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Analyzing the Heat and Flow Characteristics in Spray Cooling by Using an Optimized Rectangular Finned Heat Sink

Karabey,

Yakut

2024

Heat Trans Res

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Rapid advancements in technology constantly keep the need for thermal systems, which have high performance, on the agenda and direct the attention of researcher-engineers to the studies on improving the heat transfer. Spray cooling process depends on many parameters including nozzle diameter, surface area, surface geometry, critical heat flux, mass flow, gravity, spraying angle, and surface slope. One would need results from many experiments to better analyze the spray structure. In the present study, by using the rectangular-finned heat sinks optimized for spray cooling and those called "general," the heat and flow characteristics in spray cooling were analyzed. Water was used as the cooling fluid and the cooling fluid was atomized by using an air-supported atomized. The experiments were conducted with six air-to-liquid ratio (ALR) values, three different jet heights, three different spraying times, three different fin heights, and three different fin widths. The results are presented in the Nusselt number-air-to-liquid ratio (Nu-ALR) and jet thickness-jet velocity (tjet -Ujet) diagrams. It was determined that the ALR value tended to decrease with increasing Nusselt numbers. For the determined ALR values, Nusselt numbers decreased as the fin height increased. It was concluded that Nusselt numbers tended to decrease at all fin widths as the ALR value increased. In addition, considering the parameters examined for the rectangular-finned heat sink, separate correlations were developed for the Nusselt number, spray angle, and jet thickness.

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

Cited by 2 publications

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Optimization of the Design Parameters Using the Taguchi Method in Inclined Impingement Multijet Heat Transfer With Rectangular Finned Heat Sink

Optimization of the Design Parameters Using the Taguchi Method in Inclined Impingement Multijet Heat Transfer With Rectangular Finned Heat Sink

Analyzing the Heat and Flow Characteristics in Spray Cooling by Using an Optimized Rectangular Finned Heat Sink

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