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Heat transfer characteristics for double water‐jets on thick plates with various jet velocities and heights
Heat and Mass Transfer ( IF 2.2 ) Pub Date : 2021-04-09 , DOI: 10.1007/s00231-021-03062-5
Xiuhua Tian , Tianliang Fu , Zhaodong Wang , Guodong Wang

During cooling, the array jet impact can achieve a rapid and uniform cooling of the high-temperature plate. Previous research results mostly focused on single-jet cooling of thin plates, but the complex flow and heat transfer characteristics between multiple jets could not be obtained. To clarify the heat transfer mechanisms and cooling speed fields characteristics in different flow regions, double water-jet impingement experiments were carried out on an AISI 304 austenitic stainless-steel plate with a thickness of 50 mm. The jet exit velocity was set to 2.95, 5.90, 8.06, and 11.80 m/s, while the jet height was set to 50, 150, 250, 350, and 450 mm. Pure water was selected as the working fluid with a constant temperature of 12.8 °C. The results show that a complex trend with sequential increasing, decreasing, and increasing behaviors appears in the wetting front width, upon increasing the wetting region diameter. The confluence fluid was found to reduce the influence caused by different jet velocities and to increase the influence caused by different jet heights. In addition, it was found that an excessive amount of accumulated fluid reduces the heat transfer efficiency during transition boiling. Finally, the correlations between maximum heat flux and average maximum cooling speed were established, which provide useful data for optimizing the cooling technology.



中文翻译:

具有不同喷射速度和高度的厚板上双喷水的传热特性

在冷却过程中,阵列射流冲击可以实现对高温板的快速且均匀的冷却。先前的研究结果主要集中在薄板的单喷射冷却上,但是无法获得多喷射之间的复杂的流动和传热特性。为了阐明不同流动区域中的传热机理和冷却速度场特征,在厚度为50 mm的AISI 304奥氏体不锈钢板上进行了两次喷水冲击实验。射流出口速度设定为2.95、5.90、8.06和11.80 m / s,而射流高度设定为50、150、250、350和450 mm。选择纯水作为恒定温度为12.8°C的工作流体。结果表明,一个复杂的趋势是依次增加,减少,随着润湿区域直径的增加,在润湿前沿宽度上出现增加的行为。发现汇合流体减少了由不同喷射速度引起的影响,并增加了由不同喷射高度引起的影响。另外,发现过多的积聚的流体降低了过渡沸腾期间的传热效率。最后,建立了最大热通量与平均最大冷却速度之间的相关性,为优化冷却技术提供了有用的数据。已经发现,过多的积聚的流体降低了过渡沸腾期间的传热效率。最后,建立了最大热通量与平均最大冷却速度之间的相关性,为优化冷却技术提供了有用的数据。已经发现,过多的积聚的流体降低了过渡沸腾期间的传热效率。最后,建立了最大热通量与平均最大冷却速度之间的相关性,为优化冷却技术提供了有用的数据。

更新日期:2021-04-09
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