Vibration-induced climbing of drops

Details Vibration-induced climbing of drops Vibration-induced climbing of drops

2008-09-11

arxiv.org/abs/0809.1962v1

Physical Review Letters vol. 99, 144501 (2007)

Physics

Fluid Dynamics

4 pages, 7 figures

Scientific paper

We report an experimental study of liquid drops moving against gravity, when placed on a vertically vibrating inclined plate, which is partially wetted by the drop. The frequency of vibrations ranges from 30 to 200 Hz, and, above a threshold in vibration acceleration, drops experience an upward motion. We attribute this surprising motion to the deformations of the drop, as a consequence of an up or down symmetry breaking induced by the presence of the substrate. We relate the direction of motion to contact angle measurements. This phenomenon can be used to move a drop along an arbitrary path in a plane, without special surface treatments or localized forcing.

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