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Journal of Electronics Cooling and Thermal Control 2013年第1期3卷 1-6页

作者： amir gholaminejad Reza Hosseini Department of Mechanical Engineering Amirkabir University of Technology Tehran Iran Institute for Computational Engineering and Science University of Texas at Austin Austin USA

The objective of this paper is to investigate water supercooling. Supercooling occurs when a liquid does not freeze although its temperature is below its freezing point. In general, supercooling is an unstable condition and occurs under special conditions. The parameters that influence supercooling stability and probability of occurrence include freezer temperature and water’s initial temperature. In this paper, it is shown that with a freezer temperature range of -3℃ to -8℃, supercooling is most likely to happen and is independent of the water’s initial temperature. Furthermore, as the freezer temperature decreases, the probability of nucleation increases, causing instant freezing. Finally, it is concluded that the Mpemba effect, in which initially hot water freezes faster than initially cold water, is due to the supercooling instability in initially hot water in which nucleation agents are more active.

关键词： Supercooling Freezing Nucleation Phase Change Mpemba Effect

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Concerning The Effect of Surface Material on Nucleate Boiling Heat Transfer of R-113

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Journal of Electronics Cooling and Thermal Control 2011年第2期1卷 22-27页

作者： Reza Hosseini amir gholaminejad Mahdi Nabil 不详

This paper presents results of an experimental investigation carried out to determine the effects of surface material on nucleate pool boiling heat transfer of refrigerant R113. Experiments were performed on horizontal circular plates of brass, copper and aluminum. The heat transfer coefficient was evaluated by measuring wall superheat and effective heat flux removed by boiling. The experiments were carried out in the heat flux range of 8 to 200 kW/m2. The obtained results have shown significant effect of surface material, with copper providing the highest heat transfer coefficient among the samples, and aluminum the least. There was negligible difference at low heat fluxes, but copper showed 23% better performance at high heat fluxes than aluminum and 18% better than brass.

关键词： Boiling Heat Transfer R-113 Nucleate Boiling Surface Material

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