期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 158, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2020.120011
关键词
Heat spreader; Evaporator; Phase change heat transfer; Aluminum; Micropost; Thin-film evaporation
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2019R1A2C2004607]
- Korea-Middle East Joint Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2019K1A3A1A80113329]
- LG Electronics Inc.
- National Research Foundation of Korea [2019K1A3A1A80113329, 2019R1A2C2004607] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We introduce the superhydrophilic catenoidal aluminum (Al) wicks fabricated by a multi-step wet etching process followed by wet chemical oxidation. The unique three-dimensional sidewall morphology of the developed wick provides the re-pinning of the liquid meniscus during the receding, which substantially increases the thin evaporative film area and the resulting heat transfer performance. The nanostructured aluminum oxide layer (AlO(OH)) was incorporated to enhance both the corrosion resistance as well as the wettability of the wick with water. The experiment shows that the heat transfer coefficient of the developed wick rapidly increases as the heat flux increases up to similar to 60 W/cm(2). The maximum heat transfer coefficient of the catenoidal wick is measured to be similar to 117% higher than that of the previously-reported cylindrical ones. The numerical simulation clarifies that the increase in the heat transfer coefficient was due to the similar to 75% increase in the thin evaporative film area. The polarization scanning test shows that the corrosion resistance of the superhydrophilic catenoidal wicks was increased by similar to 82% compared to the unstructured ones, which clarifies the incorporated aluminum oxide layer acts as an effective corrosion barrier. This work introduces the Al evaporator wicks with substantially improved heat transfer as well as anti-corrosion performances, which will help develop ultra-light, high-performance heat spreaders. (C) 2020 Elsevier Ltd. All rights reserved.
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