期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 105, 期 -, 页码 147-156出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2016.09.047
关键词
Critical heat flux; Heat transfer coefficient; Wettability; TiO2; ZnO; Flow boiling
资金
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [2015M2A8A2074795]
- National Institute for Nanomaterials Technology (NINT)
- Ulsan National Institute of Science and Technology (UNIST)
- National Nanofab Center (NNFC)
- National Research Foundation of Korea [2015M2A8A2074795, 10Z20130000001] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We examined the heat transfer coefficients (HTC) and critical heat fluxes (CHF) in flow boiling on titanium dioxide (TiO2) and zinc oxide (ZnO) coated surfaces that are suggested as smart surfaces in this study. These surfaces were initially hydrophobic; they induced early onset of nucleate boiling (ONB), and many nucleation sites were observed at the initial stage of boiling compared with the SiO2 reference surface. As a result, high HTCs were identified on the smart surfaces. Additionally, under high wall superheat conditions, the surfaces became hydrophilic; there was no degradation of CHF by promoting water supply to dry areas. The results were attributed to spontaneous change of wettability of the smart surfaces. We investigated the contact angles of the surfaces after they underwent heat treatment. The contact angles decreased on the smart surfaces as the temperature increased. In conclusion, we postulated that the change in the wettability characteristics was a key factor in explaining the improvement of the HTC without degradation of the CHF, and suggest the smart surfaces. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据