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Shape transformations in rotating ferrofluid drops

K. I. Morozov·A. Engel·A. V. Lebedev
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Abstract

Floating drops of magnetic fluid can be brought into rotation by applying a rotating magnetic field. We report theoretical and experimental results on the transition from a spheroid equilibrium shape to non-axissymmetrical three-axes ellipsoids at certain values of the external field strength. The transitions are continuous for small values of the magnetic susceptibility and show hysteresis for larger ones. In the non-axissymmetric shape the rotational motion of the drop consists of a vortical flow inside the drop combined with a slow rotation of the shape. Nonlinear magnetization laws are crucial to obtain quantitative agreement between theory and experiment.

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K. I. Morozov, A. Engel, A. V. Lebedev. 2001-11-23. Shape transformations in rotating ferrofluid drops. https://doi.org/10.1209/epl%2Fi2002-00627-1

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