Instability of the origami of a ferrofluid drop in a magnetic field

Details Instability of the origami of a ferrofluid drop in a magnetic field Instability of the origami of a ferrofluid drop in a magnetic field

2011-10-26

arxiv.org/abs/1110.5768v1

Physics

Fluid Dynamics

in press in PRL (2011)

Scientific paper

Capillary origami is the wrapping of an usual fluid drop by a planar elastic membrane due to the interplay between capillary and elastic forces. Here, we use a drop of magnetic fluid whose shape is known to strongly depend on an applied magnetic field. We study the quasi-static and dynamical behaviors of such a magnetic capillary origami. We report the observation of an overturning instability that the origami undergoes at a critical magnetic field. This instability is triggered by an interplay between magnetic and gravitational energies in agreement with the theory presented here. Additional effects of elasticity and capillarity on this instability are also discussed.

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