Shear banded flows and nematic-to-isotropic transition in ER and MR fluids

Citation
O. Volkova et al., Shear banded flows and nematic-to-isotropic transition in ER and MR fluids, PHYS REV L, 82(1), 1999, pp. 233-236
Citations number
20
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
82
Issue
1
Year of publication
1999
Pages
233 - 236
Database
ISI
SICI code
0031-9007(19990104)82:1<233:SBFANT>2.0.ZU;2-M
Abstract
Above a critical shear rate we observe in suspensions polarized by an exter nal field an abrupt jump of stress and the onset of a layered stripe patter n. This novel shear-induced transition can be systematically found by using appropriated geometry. We show that it can be explained by the transition from a nematiclike order induced by the field to anisotropic state which is obtained when the shearing hydrodynamic forces on a pair of particles over come the magnetic or electrostatic forces. The critical shear stress predic ted on this basis is in good agreement with the experimental results. [S003 1-9007(98)08119-8].