Abstract
Abstract. Hydrophobic characteristics of high temperature metal surface were investigated by high-speedvisualization of water droplet impact. An aluminum plate was used as the sample plate and the initialdiameter of a water droplet was 2 mm. Transient behavior of a single droplet impinging on the surfacewith 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 o C surface temperature, however therewas no rebounding of droplet on the cold plate due to hydrophilic nature. The experimental results showthat the shape evolution of a droplet impinging on the surface varies with the Weber number, i.e. the ratioof impact inertia to capillary force. The overall water-repellent characteristics of the heated surface wasvery similar to that of the super hydrophobic surfaces. Key Words:Super hydrophobic characteristics (초소수성 현상), High temperature metal surface (고온금속표면), Weber number (웨버 수), Leidenfrost phenomenon (라이덴프로스트 현상), Rebound height (재반동 높이), Single droplet (단일 액적)
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