An experimental study of heat pipe performance using binary mixture fluids that exhibit strong concentration marangoni effects

被引：11

作者：

Armijo K.M. ^{[1
]}

Carey V.P. ^{[1
]}

机构：

[1] Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720-1740, 6123 Etcheverry Hall

来源：

Journal of Thermal Science and Engineering Applications | 2011年 / 3卷 / 03期

关键词：

Binary mixtures; Heat pipe; Marangoni effects;

D O I：

10.1115/1.4004399

中图分类号：

学科分类号：

摘要：

This paper summarizes the results of an experimental investigation of the performance characteristics of a gravity/capillary driven heat pipe using water/alcohol mixtures as a working fluid. This investigation specifically explored the use of water/alcohol mixtures that exhibit strong concentration-based Marangoni effects. Experiments to determine heat pipe performance were conducted for pure water and water/alcohol solutions with increasing concentrations of alcohol. Initial tests with pure water determined the optimal working fluid charge for the heat pipe; subsequent performance tests over a wide range of heat input levels were then conducted for each working fluid at this optimum value. The results indicate that some mixtures can significantly enhance the heat transfer coefficient and heat flux capability of the heat pipe evaporator. For the best mixture tested, the maximum evaporator heat flux carried by the coolant without dryout was found to be 52% higher than the value for the same heat pipe using pure water as a coolant under comparable conditions. Peak evaporator heat flux values above 100 W/cm2 were achieved with some mixtures. Evaporator and condenser heat transfer coefficient data are presented, and the trends are examined in the context of the expected effect of the Marangoni mechanisms on heat transfer. © 2011 American Society of Mechanical Engineers.

引用

共 20 条

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