On the effect of surface roughness height, wettability, and nanoporosity on Leidenfrost phenomena

被引:171
作者
Kim, Hyungdae [1 ,2 ]
Truong, Bao [1 ]
Buongiorno, Jacopo [1 ]
Hu, Lin-Wen [3 ]
机构
[1] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA
[2] Kyung Hee Univ, Dept Nucl Engn, Yongin 446701, Gyeonggi, South Korea
[3] MIT, Nucl Reactor Lab, Cambridge, MA 02139 USA
关键词
WATER; NANOFLUIDS; ALUMINA; DROPS; POINT;
D O I
10.1063/1.3560060
中图分类号
O59 [应用物理学];
学科分类号
摘要
In recent quenching heat transfer studies of nanofluids, it was found that deposition of nanoparticles on a surface raises its Leidenfrost point (LFP) considerably (Kim et al., Int. J. Multiphase Flow 35, 427 (2009) and Kim et al., Int. J. Heat Mass Transfer 53, 1542 (2010)]. To probe the physical mechanism underlying this observation, the effects of surface properties on LFP of water droplets were studied, using custom-fabricated surfaces for which roughness height, wettability, and porosity were controlled at the nanoscale. This approach reveals that nanoporosity is the crucial feature in efficiently increasing the LFP by initiating heterogeneous nucleation of bubbles during short-lived solid-liquid contacts, which results in disruption of the vapor film. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3560060]
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页数:3
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