Nucleate boiling performance on nano/microstructures with different wetting surfaces

被引:100
作者
Jo, HangJin [2 ]
Kim, SeolHa [1 ]
Kim, Hyungmo [3 ]
Kim, Joonwon [3 ]
Kim, Moo Hwan [1 ]
机构
[1] Pohang Univ Sci & Technol POSTECH, Div Adv Nucl Engn, Two Phase Flow Lab, Pohang 790784, South Korea
[2] Pohang Univ Sci & Technol POSTECH, Dept Mech Engn, Two Phase Flow Lab, Pohang 790784, South Korea
[3] Pohang Univ Sci & Technol POSTECH, Dept Mech Engn, MEMS & Nanotechnol Lab, Pohang 790784, South Korea
来源
NANOSCALE RESEARCH LETTERS | 2012年 / 7卷
基金
新加坡国家研究基金会;
关键词
nano/microstructure; nucleate boiling heat transfer; critical heat flux; surface wettability; capillary effect; SITE DENSITY; POOL; NANOBUBBLES; MODEL; INTERFACES;
D O I
10.1186/1556-276X-7-242
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A study of nucleate boiling phenomena on nano/microstructures is a very basic and useful study with a view to the potential application of modified surfaces as heating surfaces in a number of fields. We present a detailed study of boiling experiments on fabricated nano/microstructured surfaces used as heating surfaces under atmospheric conditions, employing identical nanostructures with two different wettabilities (silicon-oxidized and Teflon-coated). Consequently, enhancements of both boiling heat transfer (BHT) and critical heat flux (CHF) are demonstrated in the nano/microstructures, independent of their wettability. However, the increment of BHT and CHF on each of the different wetting surfaces depended on the wetting characteristics of heating surfaces. The effect of water penetration in the surface structures by capillary phenomena is suggested as a plausible mechanism for the enhanced CHF on the nano/microstructures regardless of the wettability of the surfaces in atmospheric condition. This is supported by comparing bubble shapes generated in actual boiling experiments and dynamic contact angles under atmospheric conditions on Teflon-coated nano/microstructured surfaces.
引用
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页数:9
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