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題 名 | Boiling Heat Transfer Enhancement by Surfactant Additives=以界面活性添加劑促進沸騰熱傳 |
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作 者 | 楊毓民; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 35:5 2004.09[民93.09] |
頁 次 | 頁495-508 |
分類號 | 460.02 |
關鍵詞 | 界面活性添加劑; 沸騰熱傳; Boiling heat transfer; Surfactant additive; Enhancement mechanism; Passive technique; |
語 文 | 英文(English) |
中文摘要 | 研究顯示在水中添加某些微量的界面活性劑就可以激烈地改變沸騰現象並且有效地提昇核式沸騰熱傳係數。此一方法除了衍生成為實用的沸騰熱傳促進技術之外,從基礎科學研究的角度來看也是非常有意義的事。添加界面活性劑,一方面可以濩得混合物沸騰行為的有用資訊,另一方面也可作為探討界面性質如何影響具相變的兩相流的研究模型。一般而言,界面活性劑溶液的沸騰是一個極度複雜的程序,與沌水的相變程度相較,會受到更多變數的影響。這些變因除了熱通量(或過熱度)、加熱面幾何形狀、添加劑濃度之外,還包括界面性質(表面張力及接觸角)、成核程序、馬氏效應及起泡等。此外,沸騰機制本身似乎也受到界面活性劑特性及溶液化學性質的影響。 熱傳界對於以界面活性添加劑促進沸騰熱傳的重要性素來就有深刻認知,因此已有許多相關的研究成果發表,甚至更基礎,深入的研究也在持續的進行中。不過,由於系統的複雜性,到目前為止並非所有的現象都完全了解。本文回顧了從1939年到2004年這一期間的一些相關研究結果並嘗試展現此一沸騰熱傳科技的發展過程。 |
英文摘要 | Small amounts of certain surfactant additives in water have been found to drastically change the boiling phenomena and enhance the solution’s nucleate boiling heat transfer coefficient significantly. Besides being a viable enhancement technique of boiling heat transfer, the use of surfactant additives in liquids is of interest from a fundamental scientific viewpoint as well. They can be employed to gain valuable information about the boiling behavior of mixtures and as model systems to investigate interfacial properties governing two-phase flow with phase change. Boiling with surfactant additives, is generally an exceedingly complex process, and it is influenced by a larger set of variables than the phase-change process of pure water. In addition to the wall heat flux (or wall superheat), heating surface geometry, and bulk concentration of additives, the boiling behavior is also dependent upon, among others, the role played by interfacial properties (surface tension and contact angle), nucleate process, the Marangoni effects, and foaming. It appears that boiling mechanism itself is influenced by the nature of additive and its chemistry in the solution. The importance of surfactant enhanced boiling is widely recognized by the heat transfer community and research has been carried out focused in particular on nucleate boiling heat transfer. More fundamental studies have been carried out in the past and are being undertaken at present. Not all the phenomena occurring, however, are fully understood due to the great complexity of the physics involved. This paper reviews some of the investigations on this topic covering the periods form 1939 to 2004 and attempts to show the evolution of how the practice of employing surfactant additives in liquids may develop and mature into an enhancement technique for boiling heat transfer. |
本系統中英文摘要資訊取自各篇刊載內容。