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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of jet-to-jet spacing and jet height on heat transfer characteristics of an impinging jet array
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Effects of jet-to-jet spacing and jet height on heat transfer characteristics of an impinging jet array

机译：射流间距和射流高度对射流阵列传热特性的影响

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摘要

The Nusselt number distributions for five confined circular air jets vertically impinging on a flat surface were measured. The jets were arranged as an equilaterally staggered array (a middle jet and four neighboring jets). The jet-to-jet spacing to jet diameter ratio (s/d) and the jet height to jet diameter ratio (H/d) were in the range of 2.0-8.0 and 0.5-3.0 respectively. The jet Reynolds number was 20,000. At small s/d and H/d values (s/d = 2.0 and H/d = 0.5), a maximum Nu, attributed to a strong flow impact (jet interaction) on the impingement plate, was clearly observed between the middle jet and every neighboring jet. The jet interaction decreases with an increase of the s/d and H/d. At small s/d and large H/d values (s/d = 2.0 and H/d ≥ 2.0), jet interference before impingement causes a decrease in heat transfer. However, it achieves a uniform Nusselt number distribution in the region directly covered by the jet array. At intermediate s/d and large H/d values (s/d = 4.0 and H/d ≥ 2.0), both the jet interaction and jet interference are weak, but the expelled air of the middle jet (cross flow) reduces the heat transfer of the neighboring jets. At large s/d values (s/d ≥ 6.0), regardless of the H/d value (in the range of 0.5-3.0), every jet possesses an independent cooling area on the impingement plate. The result also shows that the maximum Nu variation in the region under the jet array almost linearly increases with the sld.
机译：测量了五个垂直撞击在平坦表面上的受限圆形空气喷嘴的Nusselt数分布。射流布置成等边交错排列（一个中间射流和四个相邻射流）。喷射间距与喷射直径之比（s / d）和喷射高度与喷射直径之比（H / d）分别在2.0-8.0和0.5-3.0的范围内。喷气式雷诺数为20,000。在较小的s / d和H / d值（s / d = 2.0和H / d = 0.5）下，在中间射流之间可以清楚地观察到最大Nu值，这归因于在冲击板上的强烈流动冲击（射流相互作用）。和每一个相邻的喷气机。射流相互作用随s / d和H / d的增加而降低。在较小的s / d和较大的H / d值（s / d = 2.0且H / d≥2.0）下，撞击前的射流干扰会导致传热降低。但是，它在直接由射流阵列覆盖的区域中实现了均匀的Nusselt数分布。在中等s / d和较大的H / d值（s / d = 4.0且H / d≥2.0）下，射流相互作用和射流干扰均较弱，但中间射流的排出空气（横流）降低了热量转移相邻的飞机。在较大的s / d值（s / d≥6.0）下，无论H / d值如何（在0.5-3.0范围内），每个射流在冲击板上都具有独立的冷却区域。结果还表明，射流阵列下方区域的最大Nu变化几乎随sld线性增加。

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