Physics – Fluid Dynamics
Scientific paper
2010-06-08
Langmuir 26, 16090 (2010)
Physics
Fluid Dynamics
7 pages, 9 figures
Scientific paper
10.1021/la102330e
We experimentally investigate the splashing mechanism of a millimeter-sized ethanol drop impinging on a structured solid surface, comprised of micro-pillars, through side-view and top-view high speed imaging. By increasing the impact velocity we can tune the impact outcome from a gentle deposition to a violent splash, at which tiny droplets are emitted as the liquid sheet spreads laterally. We measure the splashing threshold for different micropatterns and find that the arrangement of the pillars significantly affects the splashing outcome. In particular, directional splashing in direction in which air flow through pattern is possible. Our top-view observations of impact dynamics reveal that an trapped air is responsible for the splashing. Indeed by lowering the pressure of the surrounding air we show that we can suppress the splashing in the explored parameter regime.
de Raa Matthias van
der Veen Roeland van
Lohse Detlef
Tsai Peichun
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