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首页> 外文期刊>Journal of enhanced heat transfer >WETTING FRONT STUDIES ON HEATED PLATE WITH ORTHOGONAL WATER JET IMPINGEMENT
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WETTING FRONT STUDIES ON HEATED PLATE WITH ORTHOGONAL WATER JET IMPINGEMENT

机译：具有正交水射流冲击的加热板润湿正面研究

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摘要

During the free-surface circular water jet impingement cooling of a heated surface (250 degrees C-900 degrees C), rewetting is an important phenomenon that can be directly correlated with the measured surface temperature history and heat flux distribution. In the present work, an experimental study of water jet impingement cooling is done on a heated horizontal SS-304 plate of dimension 78 x 78 x 13 mm(3) instrumented with seven embedded thermocouples at two different depths of 1 and 3 mm from the top surface. An orthogonal free-surface circular water jet with nozzle diameter of 4 mm is used for the current study. The effect of variation in different parameters like water flow rate, initial plate temperature, nozzle-plate spacing, and so forth on rewetting and the wetting front growth during water jet cooling is analyzed. Experimental results and visual observations show that the wetting front growth rate increases with increase in water flow rate from 3 to 5 LPM and decreases with an increase in initial plate temperature (500 degrees C-900 degrees C), respectively. However, no significant effect is observed with the change in nozzle height beyond 100 mm.
机译：在加热表面的自由表面圆形水射流冷却（250摄氏度C-900℃）期间，重新润湿是可以与测量的表面温度历史和热通量分布直接相关的重要现象。在本作工作中，在尺寸的加热水平SS-304板上进行水射流冲洗的实验研究，其尺寸为78×78×13mm（3），仪表在两个不同的深度为1和3mm的两个不同深度的七个嵌入式热电偶上进行。顶表面。使用带有4mm的喷嘴直径为4mm的正交自由表面圆形水射流。分析了不同参数等不同参数的效果，如水流速，初始板温度，喷嘴板间隔等，在水喷射冷却过程中重新润湿和润湿前生长上。实验结果和视觉观察表明，润湿前生长速率随着3至5Lpm的水流速的增加而增加，并且分别随着初始板温度（500℃-900℃）的增加而降低。然而，由于喷嘴高度超过100mm的喷嘴高度的变化没有显着效果。

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