S Dorbolo et al 2008 New J. Phys. 10 113021 doi:10.1088/1367-2630/10/11/113021
Resonant and rolling droplet
S Dorbolo, D Terwagne, N Vandewalle and T Gilet
Show affiliationsWhen an oil droplet is placed on a quiescent oil bath, it eventually collapses into the bath due to gravity. The resulting coalescence may be eliminated when the bath is vertically vibrated. The droplet bounces periodically on the bath, and the air layer between the droplet and the bath is replenished at each bounce. This sustained bouncing motion is achieved when the forcing acceleration is higher than a threshold value. When the droplet has a sufficiently low viscosity, it significantly deforms: spherical harmonic Yℓm modes are excited, resulting in resonant effects on the threshold acceleration curve. Indeed, a lower acceleration is needed when ℓ modes with m=0 are excited. Modes m≠0 are found to decrease the bouncing ability of the droplet. A break of degeneracy is observed for the m parameter. In particular, when the mode ℓ=2 and m=1 is excited, the droplet rolls on the vibrated surface without touching it, leading to a new self-propulsion mode.
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Issue 11 (November 2008)
Received 7 July 2008
Published 18 November 2008
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Resonant and rolling droplet
S Dorbolo et al 2008 New J. Phys. 10 113021
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