Nonequilibrium cluster structures formed in a thin magnetorheological fluid layer subjected to a dc magnetic field

We experimentally investigate cluster structures formed by paramagnetic particles in a thin magnetorheological (MR) fluid layer, the thickness of which normalized by the particle diameter ranges from 3.8 to 31, under a dc magnetic field perpendicular to the fluid layer. We particularly focus on clus...

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Veröffentlicht in:AIP advances 2020-05, Vol.10 (5), p.055012-055012-7
Hauptverfasser: Ukai, Tomofumi, Dong, Jun, Maekawa, Toru, Morimoto, Hisao
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Sprache:eng
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Zusammenfassung:We experimentally investigate cluster structures formed by paramagnetic particles in a thin magnetorheological (MR) fluid layer, the thickness of which normalized by the particle diameter ranges from 3.8 to 31, under a dc magnetic field perpendicular to the fluid layer. We particularly focus on cluster structures formed in a dc magnetic field of high ramping rates, in which case the structures may be greatly different from those formed under equilibrium conditions. When a dc magnetic field is applied so rapidly, paramagnetic particles form chain clusters along the field direction as expected, but some chain clusters coalesce in the lateral direction to form bent-wall structures. We analyze the dependence of cluster structures on experimental parameters such as the thickness of the MR fluid layer and the intensity of the magnetic field.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5144574