Jet impingement quenching phenomena for hot surfaces well above the limiting temperature for solid-liquid contact
Jet impingement quenching phenomena for hot surfaces well above the limiting temperature for solid-liquid contact
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DOI：
10.1016/j.ijheatmasstransfer.2007.01.059
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发表时间：
2008-03-01
影响因子：
5.2
通讯作者：
Mitsutake, Yuichi
中科院分区：
文献类型：
--
作者：
Islam, Md. Ashraful;Monde, Masanorl;Mitsutake, Yuichi
实验研究了过冷自由表面圆形水射流冲击高温表面后的现象。将5-80 K过冷度和3-15 m/s速度的2 mm水射流冲击在预热至500-600 ℃的圆柱形钢/黄铜块的平坦表面上。记录瞬态温度数据，并利用逆热传导技术预测表面温度。还采用高速摄像机来捕捉流动状况。据发现，在一定的时间内，表面温度保持远高于热力学极限温度，允许稳定的固液接触。在此期间发生了什么以及是什么使表面温度下降到极限温度是重要的问题，本文给出了可能的答案。在不同的实验条件下的冲击表面的中心处的冷却曲线也解释了与极限温度的关系，并确定了具有不同类型的流型的三个特征区域。(C)2007年由Elsevier Ltd.出版
Experiments were conducted to understand the phenomena that happen just after a subcooled free-surface circular water jet impinges on a high temperature surface. A 2 mm-water-jet of 5-80 K subcooling and 3-15 m/s velocity was impinged on the flat surface of a cylindrical steel/brass block that was preheated to 500-600 degrees C. The transient temperature data were recorded and used to predict the surface temperature by an inverse heat conduction technique. A high-speed video camera was also employed to capture the flow condition. It is found that for a certain period of time the surface temperature remains well above the thermodynamic limiting temperature that allows stable solid-liquid contact. What happens during this period and what makes the surface temperature drop to the limiting temperature are important questions whose possible answers are given in this article. The cooling curves at the center of the impinging surface for different experimental conditions are also explained in relation with the limiting temperature and three characteristic regions having different types of flow patterns are identified. (C) 2007 Published by Elsevier Ltd.