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首页> 外文期刊>Heat Transfer Engineering >Study of Heat Transfer Distribution in a Channel with Inclined Target Surface Cooled by a Single Array of Staggered Impinging Jets
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Study of Heat Transfer Distribution in a Channel with Inclined Target Surface Cooled by a Single Array of Staggered Impinging Jets

机译：单列交错式射流冷却的斜靶表面通道中的传热分布研究

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摘要

An experimental Investigation has been carried out to study the heat transfer characteristics in a channel with a heated target surface inclined at an angle, cooled by a single array of staggered impinging jets. The work encompasses the effect of three feed channel aspect ratios (5, 7, 9) and three exit outflow orientations (coincident with the entry flow, opposed to the entry flow, and both), and three Reynolds numbers (9400, 14,400, 18,800) on heat transfer. Results show that increasing the Reynolds number increases the heat transfer on the inclined target surface. The outflow orientations affect significantly the local heat transfer charactracistrics, through influencing the jet flow together with the crossflow in the impingement channel. The outflow orientation coincident with the entry flow and the outflow from both sides show better averaged Nusselt number values compared to outflow orientation opposed to the entry flow. The inclined surface affects the local Nusselt number distribution especially for the outflow orientation opposing the entry flow at the narrow region of the impingement channel. In general, the feed channel aspect ratio does not affect the Nusselt number distribution, except for outflow coincident with the entry flow. The local Nusselt number for aspect ratio 9 has been found to be greater than the Nusselt number for aspect ratio 5 by 11%. Additionally, for a given jet-orifice plate with staggered holes, the heat transfer is almost the same throughout the target surface for the outflow exiting in both directions.
机译：已经进行了实验研究，以研究在加热目标表面以一定角度倾斜，由单列交错撞击射流冷却的通道中的传热特性。该工作包含三个进料通道长宽比（5、7、9）和三个出口流出方向（与入口流量一致，与入口流量相反，以及两者兼有）和三个雷诺数（9400、14,400、18,800）的影响）。结果表明，增加雷诺数会增加目标斜面上的热传递。通过影响射流和冲击通道中的横流，流出方向会显着影响局部传热特性。与入口流一致的流出方向与从两侧流出的流相比，与入口流相反的流出方向显示出更好的平均Nusselt值。倾斜的表面会影响局部Nusselt数分布，特别是对于在冲击通道的狭窄区域与流入流相反的流出方向。通常，除了与进入流一致的流出外，进料通道的长宽比不会影响Nusselt数的分布。已发现长宽比为9的本地Nusselt值比长宽比为5的Nusselt数大11％。另外，对于给定的带交错孔的射流孔板，在整个目标表面上的热传递在两个方向上都几乎相同。

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