- 기울어진 미세 텍스쳐 표면에 충돌하는 단일 액적의 퍼짐 특성
- ㆍ 저자명
- 신동환,문주현,이성혁,Shin. Dong-Hwan,Moon. Joo-Hyun,Lee. Seong-Hyuk
- ㆍ 간행물명
- 한국액체미립화학회지
- ㆍ 권/호정보
- 2011년|16권 2호|pp.104-109 (6 pages)
- ㆍ 발행정보
- 한국액체미립화학회
- ㆍ 파일정보
- 정기간행물| PDF텍스트
- ㆍ 주제분야
- 기타
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.