Rhythmic Motion of a Droplet under a DC Electric Field

Details Rhythmic Motion of a Droplet under a DC Electric Field Rhythmic Motion of a Droplet under a DC Electric Field

2006-05-21

arxiv.org/abs/physics/0605180v1

Physics

Fluid Dynamics

Scientific paper

10.1103/PhysRevE.74.046301

The effect of a stationary electric field on a water droplet with a diameter of several tens micrometers in oil was examined. Such a droplet exhibits repetitive translational motion between the electrodes in a spontaneous manner. The state diagram of this oscillatory motion was deduced; at 0-20 V the droplet is fixed at the surface of the electrode, at 20-70 V the droplet exhibits small-amplitude oscillatory motion between the electrodes, and at 70-100 V the droplet shows large-amplitude periodic motion between the electrodes. The observed rhythmic motion is explained in a semi-quantitative manner by using differential equations, which includes the effect of charging the droplet under an electric field. We also found that twin droplets exhibit synchronized rhythmic motion between the electrodes.

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