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Controlling the partial coalescence of a droplet on a vertically vibrated bath
Phys. Rev. E 76, 035302(R) – Published 12 September, 2007
DOI: https://doi.org/10.1103/PhysRevE.76.035302
Abstract
A method is proposed to stop the cascade of partial coalescences of a droplet laid on a liquid bath. The strategy consists of vibrating the bath in the vertical direction in order to keep small droplets bouncing. Since large droplets are not able to bounce, they partially coalesce until they reach a critical size. The system behaves as a low pass filter: droplets smaller than the critical size are selected. This size has been investigated as a function of the acceleration and the frequency of the bath vibration. Results suggest that the limit size for bouncing is related to the first mode of the droplet deformation.
Article Text
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To obtain Eq. (3), Couder et al. assume that the droplet is not able to store interfacial energy during the bouncing. The excess of kinetic energy at impact is then dissipated by viscous forces.
The Ohnesorge criterion is designed for interfaces at rest. However, it seems to prevail for interfaces in motion: only the critical Ohnesorge should be slightly different.