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Enhance Heat Transfer Performance of Compact Heat Exchangers. by Minimizing the Contact Resistance between Fins and Tubes

Автор:   Wui-wai C.
мягкая обложка
236 страниц
2008 год
Издательство:   Книга по Требованию
Цена:
3231 руб
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Описание:The experimental results have been validated by finite element analyses. This book lists forty-nine references. The parameters considered for enhancing the performance include the use of bullets of different sizes for the expansion of the tube into the fins and the coating of the tubes with soft conducting metals. Thermal contact resistance is a significant component of the overall resistance to heat transfer in finned tube compact heat exchangers. Especially where the joint between the tube and the fins is obtained by mechanical expansion, the thermal contact resistance may be greater than a quarter of the overall resistance. The research work described herein was conducted with the guidance of Dr. C. V. Madhusudana, a well known authority on thermal contacts. The limitations of each of these approaches are discussed and recommendations are made for further research. The research described in this book explores the means by which such reduction may be achieved. This work describes the design and fabrication of a test apparatus for the measurement of thermal contact resistance. Reduction of thermal contact resistance results in improved performance of compact heat exchangers.


Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка Orthomol Immun Junior Сила иммунитета на страже Вашего ребенка

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Using Your Brain — for a Change

The conductivity of charcoal is greater than sheepskin, but a lot less than steel. Ask the next firewalker you meet if he's willing to walk the same length on a steel plate that's at the same temperature as those coals! There is an additional factor that physicists call the "Leiden–frost effect." When there is a significant temperature difference between two substances, and the cooler one is a liquid or contains liquid, a thin vapor layer forms to create an insulating barrier that reduces heat transfer significantly. All the evidence I have indicates that a ten foot, 1.5 second firewalk is something' anyone can do, with or without evangelistic preparation, but very few people think they can do. Woman: Some people have beliefs that don't seem to influence their behavior much. For instance, I have a boss who always talks about how people should be nice to each other, but he's usually mean to people himself. How do you explain that? I try to understand how things work, not "explain" them. There are several possibilities ...»

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