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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >A visualization study of the flow dynamics of a single round jet impinging on porous media
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A visualization study of the flow dynamics of a single round jet impinging on porous media

机译：单个圆形射流撞击多孔介质的流动动力学的可视化研究

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摘要

The use of high surface area foamed metals in heat sink design is desirable to improve thermal performance and there have been a number of studies which investigated the heat transfer aspects of jet impingement on foamed metals. However, an understanding of the fluid dynamics is also crucial to optimize the convective flow and heat transfer performance. In this experimental study, smoke-wire flow visualization is employed to investigate the behavior of a single round jet of 21. mm and 41. mm diameter issuing from a straight tube and impinging on a foamed aluminum heat sink. The permeability of the foamed aluminum is varied and the effect on the flow dynamics of the impinging jet is examined. The effects of jet-to-surface spacing and Reynolds number are identified. Recirculation regions and flow deflection patterns are identified. Flow deflection is found to be more significant for low jet exit-surface spacing and for low permeability foams. Thus, an increase in jet-exit-to-surface spacing allows more of the flow to evenly penetrate the heat sink. It is also found that an increase in Reynolds number from a laminar to a turbulent jet allows the flow to penetrate the porous media more evenly and reduces the recirculation region at the exit of the foam.
机译：在散热器设计中使用高表面积泡沫金属是改善热性能所需要的，并且已有许多研究调查了射流撞击泡沫金属的传热方面。但是，了解流体动力学对优化对流和传热性能也至关重要。在此实验研究中，使用烟丝流动可视化技术来研究从直管发出并撞击在泡沫铝散热器上的直径为21毫米和41毫米的单个圆形喷嘴的行为。泡沫铝的渗透性会发生变化，并检查对射流流动动力学的影响。确定了喷射到表面的距离和雷诺数的影响。确定了回流区域和流动偏斜模式。对于低射流出口表面间距和低渗透性泡沫，发现流动偏转更为重要。因此，射流出口到表面的间距增加，允许更多的流量均匀地穿透散热器。还发现，从层流到湍流射流的雷诺数增加允许流动更均匀地渗透到多孔介质中并减小泡沫出口处的再循环区域。

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