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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of jet plate size and plate spacing on the stagnation Nusselt number for a confined circular air jet impinging on a flat surface
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Effects of jet plate size and plate spacing on the stagnation Nusselt number for a confined circular air jet impinging on a flat surface

机译：密闭圆形空气射流撞击平面时射流板尺寸和板间距对滞止Nusselt数的影响

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摘要

This work deals with the effects of jet plate size and plate spacing (jet height) on the heat transfer characteristics for a confined circular air jet vertically impinging on a flat plate. The jet after impingement was restricted to flow in two opposite directions. A constant surface heat flux of 1000W/m~2 was arranged. Totally 88 experiments were performed. Jet orifices individually with diameter of 1.5, 3, 6 and 9 mm were adopted. Jet Reynolds number (Re) was in the range 10,000-30,000 and plate spacing-to-jet diameter ratio (H/d) was in the range 1-6. Eleven jet plate width-to-jet diameter ratios (W/d= 4.17-41.7) and seven jet plate length-to-jet diameter ratios (L/d= 5.5-166.7) were individually considered. The measured data were correlated into a simple equation. It was found that the stagnation Nusselt number is proportional to the 0.638 power of the Re and inversely proportional to the 0.3 power of the H/d. The stagnation Nusselt number was also found to be a function of exp[-0.044( W/d) - 0.011(L/d)]. Through comparisons among the present obtained data and documented results, it may infer that, for a jet impingement, the impingement-plate heating condition and flow arrangement of the jet after impingement are two important factors affecting the dependence of the stagnation Nusselt number on H/d.
机译：这项工作处理了垂直撞击在平板上的受限圆形空气射流的射流板尺寸和板间距（射流高度）对传热特性的影响。撞击后的射流被限制在两个相反的方向上流动。布置了恒定的表面热通量1000W / m〜2。总共进行了88次实验。分别采用直径为1.5、3、6和9毫米的射流孔。喷气雷诺数（Re）在10,000-30,000范围内，并且板间距与喷气直径比（H / d）在1-6范围内。分别考虑了11个射流板宽度与射流直径之比（W / d = 4.17-41.7）和7个射流板长度与射流直径之比（L / d = 5.5-166.7）。测得的数据被关联成一个简单的方程式。发现停滞的Nusselt数与Re的0.638幂成正比，与H / d的0.3幂成反比。还发现停滞的Nusselt数是exp [-0.044（W / d）-0.011（L / d）]的函数。通过比较目前获得的数据和记录的结果，可以推断出，对于射流撞击，射流后的射流板加热条件和射流的流动布置是影响停滞努塞尔数对H /的依赖性的两个重要因素。 d。

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