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Spinning ferrofluid microscopic droplets

E. Janiaud1,2 , F. Elias1 , J.-C. Bacri1,2 , V. Cabuil3 , R. Perzynski1

1 Laboratoire des Milieux D?sordonnés et Hétérogènes, Universit? Paris 6, case 78, 4 place Jussieu, 75252 Paris cedex 05, France
2 Universit? Paris 7, Unit? de Formation et de Recherche de Physique, case 70.08, 2 place Jussieu, 75251 Paris cedex 05, France
3 Laboratoire des Liquides Ioniques et des Interfaces Chag?s, Universit? Paris 6, case 0063, 4 place Jussieu, 75252 Paris cedex 05, France

We investigate experimentally the behaviour of microscopic ferrofluid droplets under the effect of a rotating external magnetic field. Depending on the system control parameters, the drops adopt fascinating shapes, like starfish, rod-like or pancake shapes, co-rotating with the external field, but also creeping snakes, swirling loops and rings. We describe these structures and classify them in a phase diagram. With simple arguments, we discuss the droplet dynamics and morphology in each phase. Fig. 11, Refs. 22.

Magnitnaya Gidrodinamika 36, No. 4, 365-378, 2000 [PDF, 0.47 Mb]
Magnetohydrodynamics 36, No. 4, 300-311, 2000 [PDF]

Copyright: Institute of Physics, University of Latvia
Electronic edition ISSN 1574-0579
Printed edition ISSN 0024-998X