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Flows and Instabilities of Ferrofluids at the Microscale

Research paper by Arthur Zakinyan, Elena Beketova, Yuri Dikansky

Indexed on: 07 Nov '16Published on: 07 Nov '16Published in: arXiv - Physics - Soft Condensed Matter



Abstract

In the present work we report on the behavior of ferrofluid microdrops in an immiscible nonmagnetic carrier fluid and vice versa subjected to the action of magnetic fields. Our experiments evidence previously unexplored instability and flow patterns. We investigated the instabilities initiated by constant magnetic field and by combined action of constant and rotating magnetic fields. The observed instabilities lead to the formation of various microdrop configurations such as star-like and comb-like shapes, bending deformation, ridges and crests, spiral arms and rings, etc.