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本文实验研究了圆管冲击射流下通孔金属泡沫的流动换热特性,测量了10 PPI和30 PPI铜泡沫的平均努塞尔数Nu_(avg),同时采用烟线法得到冲击射流下铜泡沫的流场可视化图像。结果表明:在较高雷诺数下,存在最优冲击距离使铜泡沫的换热性能最优;在低雷诺数下,通孔铜泡沫的换热性能受冲击距离的影响较小。孔密度为10 PPI的铜泡沫较30 PPI铜泡沫的换热性能提高了约30%。通过流动可视化解释了铜泡沫的换热性能随冲击距离和PPI变化现象。
In this paper, the flow and heat transfer characteristics of the through-hole metal foam under the impact of a circular tube jet were investigated. The average Nusselt number Nu_ (avg) of the 10 PPI and 30 PPI copper foam was measured, and the copper foam The visual image of the flow field. The results show that under the high Reynolds number, the optimum impact distance exists to optimize the heat transfer performance of copper foam. At low Reynolds number, the heat transfer performance of copper foam with through hole is less affected by impact distance. Copper foams with a cell density of 10 PPI improved the heat transfer performance by about 30% over 30 PPI copper foams. Through the flow visualization of copper foam heat transfer performance with the impact distance and PPI changes phenomenon.