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http://dx.doi.org/10.15435/JILASSKR.2011.16.2.104

Spreading Characteristics of a Liquid Droplet Impacting Upon the Inclined Micro-textured Surfaces  

Shin, Dong-Hwan (중앙대학교 기계공학부)
Moon, Joo-Hyun (중앙대학교 기계공학부)
Lee, Seong-Hyuk (중앙대학교 기계공학부)
Publication Information
Journal of ILASS-Korea / v.16, no.2, 2011 , pp. 104-109 More about this Journal
Abstract
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.
Keywords
Impinging droplet; Spreading distance; Contact angle; Micro-texture; Hydrophobicity;
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