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Issue 4, 2017
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Thin-sheet creation and threshold pressures in drop splashing

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A liquid drop impacting a smooth solid substrate splashes by emitting a thin liquid sheet from near the contact line of the spreading liquid. This sheet is lifted from the substrate and ultimately breaks apart. Surprisingly, the splash is caused by the ambient gas, whose properties dictate when and if the sheet is created. Here, I focus on two aspects of this process. Using high-speed imaging I find that the time of thin-sheet creation displays a different quantitative dependence on air pressure if the sheet is created during the early stages of spreading, rather than when the liquid has already spread to a large radius. This result sheds light on previously observed impact velocity regimes. Additionally, by measuring impacts of drops on surfaces comprised of both rough and smooth regions, I identify a new threshold velocity that limits the times at which the thin sheet can be created. This velocity determines the threshold pressure below which splashing is suppressed.

Graphical abstract: Thin-sheet creation and threshold pressures in drop splashing

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Article information

11 Oct 2016
09 Dec 2016
First published
23 Dec 2016

Soft Matter, 2017,13, 740-747
Article type

Thin-sheet creation and threshold pressures in drop splashing

A. Latka, Soft Matter, 2017, 13, 740
DOI: 10.1039/C6SM02321E

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