Investigation of Boiling Heat Transfer Phenomena Associated with Impinging Liquid Jets

许多制造操作，如连铸、板坯和带材的热轧和冷轧、硬化、挤压和锻造，都使用液体射流冲击沸腾，因为它们需要在特定温度下的强化冷却速率，即“受控强化冷却”速率。然而，由于缺乏可用于设计和运行适当的受控强化冷却系统的预测工具，对精确的受控强化冷却速率的需求构成了重大的技术挑战。*当前的工业实践依赖于反复试验和积累的实地知识。因此，每年浪费数亿美元；由于不适当的受控强化冷却导致变形、开裂或缺乏适当的机械性能，导致不符合生产规格的金属零件的再加工和刮擦，向环境中排放了数百万吨有害气体。*由于不适当的控制强化冷却导致缺乏适当的机械性能，阻碍了我们的材料加工业打开新的市场。事实上，控制强化冷却不仅对金属加工行业很重要，对其他行业也很重要。例如，在电子热管理方面，缺乏适当的受控密集冷却系统是目前提供下一代高速处理器的主要障碍。在这一应用中拟议的实验研究涉及到综合模型的开发，我们的加拿大工业可以使用这些模型来更好地设计使用喷水的下一代受控强化冷却系统。**

Many manufacturing operations such as for continuous casting, hot and cold rolling of slabs and strips, hardening, extrusion and forging, employ liquid jet impingement boiling because they require intensive cooling rates at specific temperatures, i.e., "Controlled Intensive Cooling" rates. However, the need for precise controlled intensive cooling rates poses a significant technological challenge because of the lack of predictive tools that can be used to design and operate proper controlled intensive cooling systems. ******Current industrial practices rely on trial and error and on accumulated field knowledge. Consequently, hundreds of millions of dollars are wasted every year; millions of tons of harmful emissions are released into the environment due to reprocessing and scraping of metal parts that did not meet production specifications due to distortion, cracking, or lack of proper mechanical properties caused by improper controlled intensive cooling. ******The lack of proper mechanical properties caused by improper controlled intensive cooling prevents our materials processing industry from opening new markets. In fact, controlled intensive cooling is not only important for the metal processing industry, but also for other industries. For example, in electronics thermal management, the lack of proper controlled intensive cooling systems is currently the major obstacle for offering the next generation of high-speed processors. The proposed experimental research in this application is concerned with the development of comprehensive models that our Canadian industry can use to better design the next generation of controlled intensive cooling systems using water jets. **