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기울어진 미세 텍스쳐 표면에 충돌하는 단일 액적의 퍼짐 특성
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저자명
신동환,문주현,이성혁,Shin. Dong-Hwan,Moon. Joo-Hyun,Lee. Seong-Hyuk
간행물명
한국액체미립화학회지
권/호정보
2011년|16권 2호|pp.104-109 (6 pages)
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한국액체미립화학회
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

The present study investigated experimentally the spreading characteristics of a single liquid impinging on the inclined micro-textured aluminum (Al 6061) surfaces manufactured by using a micro computerized numerical control (${mu}$-CNC) milling machine. The textured surfaces were composed of patterned micro-holes (diameter of $125;{mu}m$ and depth of $125;{mu}m$). In our experiment, the de-ionized (DI) water droplet of $4.3;{mu}l$ was impinged normally on the non-textured and textured surfaces at two different Weber numbers, and the droplet impinged on the inclined surfaces with different angles. A high speed camera was used to capture sequential digital images for measurement of the maximum spreading distance. It was found that for the textured surface, the measured apparent equilibrium contact angle (ECA) increased up to $105.8^{circ}$, higher than the measured ECA of $87.6^{circ}$ for the non-textured (bare) surface. In addition, it is conjectured that the spreading distance decreased because of a liquid penetration during droplet spreading through the holes, the increase in hydrophobicity, and viscous dissipation during impact process.