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http://dx.doi.org/10.5407/JKSV.2011.10.1.021

A Visualization Study on the Characteristics of Droplets Impinging on a Hot Surface  

Kim, Dong-Yeon (부산대학교 기계공학부)
Yi, Seung-Jae (부산대학교 기계공학부)
Kim, Kyung-Chun (부산대학교 기계공학부)
Publication Information
Journal of the Korean Society of Visualization / v.10, no.1, 2012 , pp. 21-26 More about this Journal
Abstract
Hydrophobic characteristics of high temperature metal surface were investigated by high-speed visualization of water droplet impact. An aluminum plate was used as the sample plate and the initial diameter of a water droplet was 2 mm. Transient behavior of a single droplet impinging on the surface with and without heating was captured by using a high speed camera running at 4,000 frames per second. The Leidenfrost phenomenon was demonstrated for the case of $300^{\circ}C$ surface temperature, however there was no rebounding of droplet on the cold plate due to hydrophilic nature. The experimental results show that the shape evolution of a droplet impinging on the surface varies with the Weber number, i.e. the ratio of impact inertia to capillary force. The overall water-repellent characteristics of the heated surface was very similar to that of the super hydrophobic surfaces.
Keywords
Super hydrophobic characteristics; High temperature metal surface; Weber number; Leidenfrost phenomenon; Rebound height; Single droplet;
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