期刊
NANO LETTERS
卷 18, 期 10, 页码 6392-6396出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02747
关键词
Nanowires; bimorph; phase-change; boiling heat transfer; critical heat flux
类别
资金
- Center for Advanced Meta Materials (CAMM) - Ministry of Science, ICT, and Future Planning as Global Frontier Project (CAMM) [NRF-2014M3A6B3063716]
- Human Resources Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korean Government's Ministry of Trade, Industry and Energy [20174030201720]
We present a new concept of a structured surface for enhanced boiling heat transfer that is capable of self-adapting to the local thermal conditions. An array of freestanding nanoscale bimorphs, a structure that consists of two adjoining materials with a large thermal expansion mismatch, is able to deform under local temperature change. Such a surface gradually deforms as the nucleate boiling progresses due to the increase in the wall superheat. The deformation caused by the heated surface is shown to be favorable for boiling heat transfer, leading to about 10% of increase in the critical heat flux compared to a regular nanowire surface. A recently developed theoretical model that accounts for the critical instability wavelength of the vapor film and the capillary wicking force successfully describes the critical heat flux enhencement for the nanobiomorph surface with a good quantitative agreement.
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