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arXiv · 1611.07711

Worm-like instability of a vibrated sessile drop

Arnaud Hemmerle·Guillaume Froehlicher·Vance Bergeron·Thierry Charitat·Jean Farago
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Abstract

We study the effects of vertical sinusoidal vibrations on a liquid droplet with a low surface tension (ethanol) deposited on a solid substrate. In a precise range of amplitudes and frequencies, the drop exhibits a dramatic worm-like shape instability with a strong symmetry breaking, comparable to the one observed by Pucci et al. (Phys. Rev. Lett., 106 (2011) 024503) on a vibrated floating lens. However, the geometry of our system is much simpler since it does not involve the oscillation and deformation of a liquid-liquid-air contact line. We show that the Faraday waves appearing on the surface of the droplet control its shape and we draw a systematic phase diagram of the instability. A simple theoretical model allows us to derive a relation between the elongation of the droplet and the amplitude of the Faraday wave, in good agreement with measurements of both quantities.

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Arnaud Hemmerle, Guillaume Froehlicher, Vance Bergeron, Thierry Charitat, Jean Farago. 2016-11-23. Worm-like instability of a vibrated sessile drop. https://doi.org/10.1209/0295-5075%2F111%2F24003

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