How Micropatterns and Air Pressure Affect Splashing on Surfaces
نویسندگان
چکیده
منابع مشابه
Kelvin-Helmholtz instability in an ultrathin air film causes drop splashing on smooth surfaces.
When a fast-moving drop impacts onto a smooth substrate, splashing will be produced at the edge of the expanding liquid sheet. This ubiquitous phenomenon lacks a fundamental understanding. Combining experiment with model, we illustrate that the ultrathin air film trapped under the expanding liquid front triggers splashing. Because this film is thinner than the mean free path of air molecules, t...
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A liquid drop impacting a solid surface may splash either by emitting a thin liquid sheet that subsequently breaks apart or by promptly ejecting droplets from the advancing liquid-solid contact line. Using high-speed imaging, we show that surface roughness and air pressure influence both mechanisms. Roughness inhibits thin-sheet formation even though it also increases prompt splashing at the ad...
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متن کاملAir entrapment and splashing treshold in drop impacts .
We investigate here how the surrounding gas influence the dynamics of drop impacts on a thin liquid film. We describe in details the entrapment of the gas bubble using numerical simulations with high enough mesh resolution. The bubble entrapment comes from viscous effect in the thin gas layer that need to be evacuated down the drop, creating a high pressure field that deforms the drop interface...
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ژورنال
عنوان ژورنال: Langmuir
سال: 2010
ISSN: 0743-7463,1520-5827
DOI: 10.1021/la102330e