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首页> 外文期刊>Journal of Heat Transfer >Performance of an Air-Cooled Heat Sink Channel With Microscale Dimples Under Transitional Flow Conditions
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Performance of an Air-Cooled Heat Sink Channel With Microscale Dimples Under Transitional Flow Conditions

机译：过渡流动条件下带有微型酒窝的风冷散热器通道的性能

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The objective of this effort is to pursue artificial microscale surface roughness features in the form of dimples, on the walls of an air-cooled heat sink channel, as a passive option to energy-efficiently augment heat transfer in forced convection flows. High fidelity numerical simulations were employed for realizing an optimized dimple configuration and to comprehend the behavior of microsized dimples under high velocity (～17 m/s) transitional flow conditions. Fully developed flow simulations were performed, and design of experiments with response surface methodology was employed for the numerical optimization. The results showed ～30% heat transfer improvement and ～15% pressure drop increase in the fully developed region compared to a smooth-walled channel. Practicability of manufacturing 200 μm deep dimples on a 600 μm thin aluminum fin was demonstrated. Experiments were also carried out to assess the performance of the aforementioned optimized configuration in a custom built setup in the laboratory, which showed up to 10.5% heat transfer improvement and ～12% pressure drop increase over a corresponding smooth-walled channel. The above results indicate that the performance of dimples is allied with the flow development characteristics. In addition, experiments performed at Reynolds numbers other than one at which the dimples were optimized showed inferior performance showing that application-specific optimization of dimples is crucial. With further exploration of shape and design parameters, dimples might have the potential to improve thermal performance passively and form an attractive candidate to realize high-performance air-cooled heat sinks in the future.
机译：这项工作的目的是在空气冷却的散热器通道的壁上以凹痕的形式追求人造的微尺度表面粗糙度特征，作为被动选择，以有效地提高强制对流中的热传递。高保真数值模拟用于实现优化的酒窝配置，并理解在高速（〜17 m / s）过渡流动条件下微型酒窝的行为。进行了充分发展的流动模拟，并采用响应面方法进行了实验设计以进行数值优化。结果表明，与光滑壁通道相比，在完全展开的区域中传热改善了约30％，压降增加了约15％。证明了在600μm的薄铝翅片上制造200μm深的凹坑的实用性。还进行了实验，以评估上述优化配置在实验室中的定制设置中的性能，该设置在相应的光滑壁通道上显示出高达10.5％的传热改善和约12％的压降增加。以上结果表明，酒窝的性能与流动发展特性有关。此外，以除雷诺数最优化的酒窝之外的雷诺数进行的实验显示，性能较差，这表明酒窝的特定于应用的优化至关重要。随着形状和设计参数的进一步探索，酒窝可能具有被动改善热性能的潜力，并有可能成为将来实现高性能风冷散热器的有吸引力的候选者。

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