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    Behavior of an evaporating water droplet on lubricant-impregnated nano-structured surface

    Year: 2018

    Journal: Exp. Therm. Fluid Sci., Volume 96, SEP, page 216–223

    Authors: Zhang, Bong June; Kim, Kwang Jin; Lee, Chi Young

    Organizations: NSF SBIR II [1456339]; USDA SBIR II [2015-33610-23832]

    Keywords: Water droplet evaporation; Liquid-impregnated nano-structured surface (Super)hydrophobic surface; Water contact angle hysteresis

    The behavior of an evaporating water droplet on lubricant-impregnated nano-structured surface (LINS) was investigated experimentally. For comparison, the flat hydrophobic surface (FHS) and superhydrophobic nanostructured surface (SHNS) were also prepared and tested. The initial water contact angles (WCAs) of LINS, FHS, and SHNS showed 108 degrees, 103 degrees, and 153 degrees, respectively, and their WCA hysteresis (WCAH) were 2 degrees, 30 degrees, and 23 degrees, respectively. During the evaporation of water droplet, FHS showed a typical constant contact radius (CCR) mode. On the contrary, SHNS and LINS showed more complicated mixed mode. These differences of evaporation modes were closely related to the total evaporation time. Initial WCA of LINS was between FHS and SHNS, but the water droplet on LINS showed the longest total evaporation time in the test surfaces. This may be because LINS has the water droplet of the high aspect ratio during the evaporation and the low thermal effusivity. In such a case, the large height of water droplet plays a role to the longer thermal resistance path, which can result in extending the total evaporation time.
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