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http://dx.doi.org/10.5695/JKISE.2021.54.2.90

Enhancement of Condensation Heat Transfer of Anodized Aluminum by Teflon Coating and Oil-Impregnation  

Kang, Minjoo (Department of Metallurgical Engineering, Pukyong National University)
Lee, Jonghoon (Department of Metallurgical Engineering, Pukyong National University)
Cha, Soojin (Department of Metallurgical Engineering, Pukyong National University)
Shin, Yeaji (Department of Metallurgical Engineering, Pukyong National University)
Kim, Donghyun (Business Support Division, Korea Institute of Ceramic Engineering and Technology)
Kim, Kyung-Ja (Business Support Division, Korea Institute of Ceramic Engineering and Technology)
Lee, Junghoon (Department of Metallurgical Engineering, Pukyong National University)
Publication Information
Journal of the Korean institute of surface engineering / v.54, no.2, 2021 , pp. 90-95 More about this Journal
Abstract
Surface modification technique enabling the control of condensation provides various benefit in various engineering systems, such as heat transfer, desalination, power plants, and so on. In this study, lubricant oil-impregnation into Teflon-coated nanoporous anodic oxide layer of aluminum to enhance a de-wetting and mobility of water droplet on surface. Due to the surface treatment improving water-repellency, the condensation mode is changed to dropwise, thus the frequency of sliding condensed water droplet on surface is increased. For these reasons, the surface of oil-impregnated Teflon-coated nanoporous anodic aluminum oxide shows significantly enhanced condensation heat transfer compared to bare aluminum surface. In addition, the porosity of anodic aluminum oxide affected the mobility of water droplet even with oil-impregnation and Teflon-coating, indicating that the optimization of porous structure of anodic oxide is required for maximizing the condensation heat transfer.
Keywords
Condensation Heat Transfer; Anodic Aluminum Oxide; Hydrophobic; Nanoporous Structure;
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