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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Rewetting of a hot vertical surface by liquid sprays
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Rewetting of a hot vertical surface by liquid sprays

机译：通过液体喷雾重新润湿热的垂直表面

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Hot surfaces rewetting interests several technological fields. A very important application is in nuclear reactors technology, where it governs the cooling of overheated fuel elements during hypothesized loss of coolant accidents (LOCAs). This phenomenon is also important in many normal processes and accidental situations taking place in conventional processes. For example when the integrity of metallic containers, filled by toxic or dangerous substances, is endangered by a hypothetical fire. The rewetting consists in the re-establishment of coolant in contact with metallic surfaces become dried due to high temperature. To this end cold liquid is injected on these surfaces via sprays or other means. The knowledge of the heat transfer phenomenology between the metallic wall and cooling fluid is very important for safe accident management and containment. Recently, about this topic, at the Institute of Energetic Thermal-Fluid Dynamics of ENEA (the Italian National research body for Energy and Ambient, at Casaccia), experimental tests on the cooling of a hot vertical surface have been carried out, by using spraying devices of various configuration, to supply subcooled water at the top. The reference situation was a tank surface subjected to a fire. In the framework of a research collaboration between the Department of Nuclear Engineering (DIN) of the University of Palermo and the above mentioned Institute, a model set up at DIN has been tested as regards its capability to describe the ENEA experimental data. The results of this activity seem quite satisfactory, as we'll show in the present paper. (C) 2005 Elsevier Inc. All rights reserved.
机译：热表面再润湿涉及多个技术领域。一个非常重要的应用是在核反应堆技术中，该技术在假定的冷却剂事故（LOCA）丢失期间控制过热燃料元件的冷却。在许多常规过程中以及在常规过程中发生的意外情况下，这种现象也很重要。例如，当假想的火灾危及充满有毒或危险物质的金属容器的完整性时。再润湿在于重新建立与金属表面接触的冷却剂，该金属由于高温而变干。为此，通过喷雾或其他方式将冷液体注入这些表面上。了解金属壁和冷却液之间的传热现象对于安全事故管理和围堵非常重要。最近，关于这个主题，在ENEA的能量热流体动力学研究所（意大利国家能源和环境研究机构，位于卡萨奇亚），已通过喷涂对热垂直表面进行了冷却试验。各种配置的设备，在顶部提供过冷水。参考情况是坦克表面起火。在巴勒莫大学核工程系（DIN）与上述研究所之间的研究合作框架内，已经对在DIN上建立的模型描述ENEA实验数据的能力进行了测试。正如我们将在本文中显示的那样，此活动的结果似乎令人满意。 （C）2005 Elsevier Inc.保留所有权利。

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