Issue |
Europhys. Lett.
Volume 40, Number 4, November II 1997
|
|
---|---|---|
Page(s) | 465 - 470 | |
Section | Cross-disciplinary physics and related areas of science and technology | |
DOI | https://doi.org/10.1209/epl/i1997-00489-5 | |
Published online | 01 September 2002 |
A comparison between flow-induced structures in electrorheological and magnetorheological fluids
Laboratoire de Physique de la Matière Condensée, Université de
Nice-Sophia Antipolis, CNRS (UMR 6622), 06108 Nice Cedex 2, France
Received:
7
July
1997
Accepted:
3
October
1997
We present the patterns observed in suspensions placed in an oscillating shear
flow. We show that, in the presence of an electric field, above a critical
field inducing a phase separation, and above a critical strain, , different patterns are found depending on the strain amplitude and on
the field intensity. The ultimate structure at high field and strain is formed
of thick stripes aligned perpendicularly to the flow. In certain conditions an
instability with sawteeth formation is found to develop on these stripes. For
magnetic suspensions, above the same critical strain, we only observe the
formation of a regular pattern of stripes aligned with the flow. This
difference between the patterns formed under electric or magnetic field is explained by
a difference in boundary conditions. It is also proved that the stripes
perpendicular to the flow are due to inertial effects.
PACS: 83.50.Pk – Effects of electric and magnetic fields / 75.50.Mm – Magnetic liquids / 82.70.Kj – Emulsions and suspensions
© EDP Sciences, 1997
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