Time effect on wetting transition of smart surface and prediction of the wetting transition for critical heat flux in pool boiling
SCIE
SCOPUS
- Title
- Time effect on wetting transition of smart surface and prediction of the wetting transition for critical heat flux in pool boiling
- Authors
- Kim, Jin Man; Kim, TaeJoo; Yu, Dong In; Kim, Moo Hwan; Moriyama, Kiyofumi; Park, Hyun Sun
- Date Issued
- 2017-11
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- A smart surface that is a TiO2-coated surface (TCS) is a hydrophobic surface initially, but becomes a hydrophilic surface when heated. Therefore, such a surface can be used to enhance both boiling heat transfer (BHT) and critical heat flux (CHF) in pool boiling. In the present study, the time effect of the wetting transition of TCS was focused on. The CHF on TCS was enhanced more when the holding time of the heat flux in high-temperature regime was increased. By observing changes in contact angles on TCS through heat treatment in air, it was found that the wetting transition was affected not only by the temperature, but also by the time. Thus, a variation of the receding contact angle was correlated in the form of an exponential function. The suggested empirical correlation includes temperature and time, and it describes the transition of the receding contact angle. The correlation was also used to predict the CHF on TCS in pool boiling. As a result, CHFs on TCS could be explained using the correlation. (C) 2017 Elsevier Ltd. All rights reserved.
- Keywords
- TIO2 THIN-FILMS; SOL-GEL METHOD; PHOTOCATALYTIC ACTIVITY; CONTACT-ANGLE; WETTABILITY CONVERSION; NANO-FLUIDS; CHF; NANOPARTICLES; KINETICS; WATER
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/50772
- DOI
- 10.1016/j.ijheatmasstransfer.2017.06.114
- ISSN
- 0017-9310
- Article Type
- Article
- Citation
- INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, vol. 114, page. 735 - 742, 2017-11
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