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首页> 外文期刊>Journal of Thermal Science and Engineering Applications: Transactions of the ASME >Jet Impingement Heat Transfer Enhancement by Packing High-Porosity Thin Metal Foams Between Jet Exit Plane and Target Surface
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Jet Impingement Heat Transfer Enhancement by Packing High-Porosity Thin Metal Foams Between Jet Exit Plane and Target Surface

机译：喷射射流薄金属泡沫射流出口平面和靶表面之间的喷射冲击热传递增强

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摘要

High-porosity metal foams are known for providing high heat transfer rates, as they provide a significant increase in wetted surface area as well as highly tortuous flow paths resulting in enhanced mixing. Further, jet impingement offers high convective cooling, particularly at the jet footprint areas on the target surface due to flow stagnation. In this study, high-porosity thin metal foams were subjected to array jet impingement, for a special crossflow scheme. High porosity (92.65%), high pore density (40 pores per inch (ppi)), and thin foams (3 mm) have been used. In order to reduce the pumping power requirements imposed by full metal foam design, two striped metal foam configurations were also investigated. For that, the jets were arranged in 3 x 6 array (x/d(j) = 3.42, y/d(j) = 2), such that the crossflow is dominantly sideways. Steady-state heat transfer experiments have been conducted for varying jet-to-target plate distance z/d(j) = 0.75, 2, and 4 for Reynolds numbers ranging from 3000 to 12,000. The baseline case was jet impingement onto a smooth target surface. Enhancement in heat transfer due to impingement onto thin metal foams has been evaluated against the pumping power penalty. For the case of z/d(j) = 0.75 with the base surface fully covered with metal foam, an average heat transfer enhancement of 2.42 times was observed for a concomitant pressure drop penalty of 1.67 times over the flow range tested.
机译：已知高孔隙金属泡沫以提供高传热速率，因为它们提供了湿润的表面积以及高度曲折的流动路径，其产生了显着增加，导致混合增强。此外，喷射冲击提供高对流冷却，特别是由于流动停滞的目标表面上的喷射足迹区域。在该研究中，对于特殊的十字流程，对高孔隙率薄金属泡沫进行阵列喷射冲击。高孔隙率（92.65％），高孔密度（每英寸40孔（PPI）），使用薄泡沫（3mm）。为了降低全金属泡沫设计施加的泵送电源要求，还研究了两个条纹金属泡沫配置。为此，喷射以3×6阵列（X / D（j）= 3.42，y / d（j）= 2）排列，使得横流是偏向的。用于改变射流到靶板距离Z / D（J）= 0.75,2和4的急性传热实验，用于从3000到12,000的雷诺数。基线壳体被喷射到光滑的目标表面上。针对泵送动力损失评估了由于冲击导致薄金属泡沫引起的热传递增强。对于Z / D（j）= 0.75的情况下，用金属泡沫完全覆盖的碱表面，观察到2.42次的平均热传递增强，在测试的流量范围内伴随的1.67倍的伴随压力下降罚分。

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