Experimental investigation and parameter analysis of micro-jet impingement heat sink for improved heat transfer performance

Li, Yi; Yang, Shu; Pan, Mei

doi:10.1016/j.cep.2022.108867

Cited by 14 publications

(1 citation statement)

References 27 publications

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“…Moreover, it was discovered that increasing the stream-wise jet-to-jet spacing or decreasing the jet hole-to-target plate distance enhances the performance by reducing thermal resistance and improving temperature uniformity [26].…”

Section: Introductionmentioning

confidence: 99%

Impact of Measurements Techniques on Heat Transfer Characteristics in Air Jet Arrays

Al Daraje,

Awad,

Gogazeh

et al. 2024

J. eng. sustain. dev.

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Air impact processes have diverse applications in engineering, including backflow welding, textile drying, and gas turbine blade and combustion liner cooling. This research examines the influence of experimental methodologies and measurement tools on convective heat transfer in adjustable air jet assemblies. The experiment involves the use of heated targets made of thin stainless steel foil with constant heat flux boundary conditions. Thermography measures target surface temperatures by analyzing how internal passage cross-flow affects convective heat transfer via outflow adjustments. The experiments involve two arrays of jet nozzles: inline and staggering, each comprising 44 impingement jet nozzles arranged in 4 rows with 11 jet holes in each row. The study presents unsteady time average local and spatial Nusselt numbers as functions of jet Reynolds number (4630-14000) and explores their dependence on the jet nozzle diameter. Cross-flow levels significantly affect spatial and local Nusselt numbers in both local and span-wise averaged values, regardless of the Reynolds number. Strong cross-flow (single configuration) distributes flow causing turbulence and uneven heat distribution, reducing Nusselt numbers. In contrast, moderate cross-flow (double configuration) improves heat transfer and increases Nusselt numbers. The study emphasizes the crucial role of experimental techniques in heat transfer evaluation and demonstrates agreement with prior studies within a standard error below 5%.

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Section: Introductionmentioning

confidence: 99%

Impact of Measurements Techniques on Heat Transfer Characteristics in Air Jet Arrays

Al Daraje,

Awad,

Gogazeh

et al. 2024

J. eng. sustain. dev.

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Numerical investigation of the impact of inlet and outlet ports of water jet impingement cooling modules

Tarek,

Nabil,

Hassan

et al. 2024

Heat Trans

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The ever‐growing applications of high‐power chips have driven research efforts to enhance the performance of their active cooling modules. This study proposes a simple tweak of the cooling module's ports for lower thermal resistance. A dual‐inlet single‐outlet (CP2) jet impingement cold plate (JICP), a dual‐inlet dual‐outlet (CP3) JICP, and a single‐inlet dual‐outlet (CP4) JICP were assessed computationally and benchmarked against a single‐inlet single‐outlet JICP (CP1) at the same area ratio (AR) and average diameter (Davg) of inlet and outlet ports. The results show that the pressure losses inflate by up to 4.67 folds when using CP3 with AR = 5/3 and Davg = 3.0 mm. Yet, this design also shows the largest Nusselt number and the lowest outlet water temperature, module body temperature, average temperature of the target surface, and thermal resistance (0.07415 K/W). The thermal resistance is reduced by 34.13% using CP3 at AR = 3/5 and Davg = 6.0 mm. The temperature uniformity index was boosted to 97.5%. These enhancements are attributed to the shorter and symmetric flow path, the shorter residence time of water within the JICP, and the direct heat diffusion by the walls of the lower chamber.

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Infrared Thermal Image Processing Technique for Evaluating Superheated Steam as a Dry Sanitation Method

Park,

Balasubramaniam

2024

Food Bioprocess Technol

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The objectives of this study were to develop a thermal image analysis method for assessing the surface temperature of stainless steel (30 cm × 30 cm) during pilot-scale superheated steam sanitation and evaluate the sanitation efficacy based on the inactivation of Enterococcus faecium. An infrared camera, calibrated to a root-mean-square error (RMSE) of 1.4 °C within a range of 25 °C and 250 °C, was utilized. The results showed that the surface temperature at the impingement point decreased linearly from 245.6 ± 3.2 to 157.6 ± 1.7 °C as the nozzle-to-surface distance was increased from 2 to 5 cm. Furthermore, at a 2 cm nozzle-to-surface distance, temperatures swiftly dropped from 245.6 ± 3.2 to 95.8 ± 6.0 °C as the radial distance increased from 0 to 10 cm. In the stagnation region (0–1 cm radial distance), where the steam jet directly contacts the surface, the time required to achieve a 3-log reduction of E. faecium was reduced from 3 to 1 min as the nozzle-to-surface distance decreased from 5 to 2 cm. The efficacy of superheated steam sanitation was further evaluated under practical sweeping conditions, demonstrating a 2.7 ± 0.4 log reduction of E. faecium on a 900 cm2 stainless steel surface within 10 min. This study thus highlights the potential use of thermal image analysis for optimizing superheated steam sanitation processes, particularly in dry food processing environments.

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Experimental investigation and parameter analysis of micro-jet impingement heat sink for improved heat transfer performance

Cited by 14 publications

References 27 publications

Impact of Measurements Techniques on Heat Transfer Characteristics in Air Jet Arrays

Impact of Measurements Techniques on Heat Transfer Characteristics in Air Jet Arrays

Numerical investigation of the impact of inlet and outlet ports of water jet impingement cooling modules

Infrared Thermal Image Processing Technique for Evaluating Superheated Steam as a Dry Sanitation Method

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