期刊
APPLIED PHYSICS LETTERS
卷 109, 期 24, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4971986
关键词
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资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education [NRF-2015R1D1A1A01056710]
- National Research Foundation of Korea [2015R1D1A1A01056710, 2015H1A2A1034590] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A boiling crisis, or critical heat flux (CHF), is a condition that determines the upper bound on removable thermal energy at a boiling surface. In such situations, the liquid cannot wet the surface because a vapor film completely covers it. CHF is enhanced on micro-structured surfaces when under boiling conditions. CHF values were measured for surfaces with rectangular microchannel geometries of various channel widths, (10-30 mu m) and generally increased in value as channel widths decreased. However, the CHF value for the 5-mu m channel-width surface was found to be lower than the wider channel-width surfaces. This observation contradicts models based on vapor recoil and classical instability mechanisms. Hence, we present a fluid-dynamics model that considers capillary pumping and viscous friction. With a focus on the spatial distribution of the liquid penetration region and the local dry spot under a large vapor bubble, this model can accurately predict the CHF variation associated with different channel widths. Published by AIP Publishing.
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