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首页> 外文期刊>Journal of Heat Transfer >Full-Field Flow Measurements and Heat Transfer of a Compact Jet Impingement Array With Local Extraction of Spent Fluid
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Full-Field Flow Measurements and Heat Transfer of a Compact Jet Impingement Array With Local Extraction of Spent Fluid

机译:局部抽取废液的紧凑型射流冲击阵列的全场流量测量和传热

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Jet impingement cooling is widely used due to the very high heat transfer coefficients that are attainable. Both single and multiple jet systems can be used, however, multiple jet systems offer higher and more uniform heat transfer. A staggered array of 8.46 mm diameter impingement jets with jet-to-jet spacing of 2.34 D was examined where the spent fluid is extracted through one of six 7.36 mm diameter extraction holes regularly located around each jet. The array had an extraction area ratio (A_e/A_(jet)) of 2.23 locally and was tested with a jet-to-target spacing (H/D) of 1.18 jet diameters. Magnetic resonance velocimetry was used to both quantify and visualize the three dimensional flow field inside the cooling cavity at jet Reynolds numbers of 2600 and 5300. The spatially averaged velocity measurements showed a smooth transition is possible from the impingement jet to the extraction hole without the presence of large vortical structures. Mean Nusselt number measurements were made over a jet Reynolds number range of 2000-10,000. Nusselt numbers near 75 were measured at the highest Reynolds number with an estimated uncertainty of 7%. Large mass flow rale per unit heat transfer area ratios were required because of the small jet-to-jet spacing.
机译:由于可获得很高的传热系数,因此广泛使用射流冲击冷却。可以使用单喷射系统和多喷射系统,但是,多喷射系统提供更高,更均匀的传热。检查了喷嘴间距为2.34 D的8.46 mm直径冲击射流的交错阵列,其中废液通过规则地围绕每个射流的六个直径7.36 mm的抽气孔之一抽出。该阵列局部具有2.23的提取面积比(A_e / A_(jet)),并以1.18的射流直径的射靶间距(H / D)进行测试。磁共振测速法用于量化和可视化雷诺数分别为2600和5300的冷却腔内的三维流场。空间平均速度测量结果表明,从撞击流到提取孔的平稳过渡是可能的大型旋涡结构。平均努塞尔数测量是在2000-10,000的雷诺数范围内进行的。在最高雷诺数下测得的接近75的Nusselt数,估计不确定度为7%。由于射流与射流之间的间距较小,因此每单位传热面积比需要较大的质量流量比。

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