Negative differential viscosity in magnetic suspensions / Zubarev A. Yu. // JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS. - 2014. - V. 118, l. 5. - P. 814-821.

ISSN/EISSN:

1063-7761 / 1090-6509

Type:

Article

Abstract:

Recent experiments have shown that the dependence of the macroscopic viscous stress on the mean velocity gradient during the Couette flow of concentrated magnetic suspensions in an external magnetic field is N-shaped. As the field strength is decreased, the amplitude of the N-shaped curve decreases and in the absence of the field, the stress monotonically increases with the shear velocity. A model is proposed to explain the shape of the rheological curve. The model assumes that the magnetic field initiates the formation of dense aggregates in a suspension, which connect the opposite walls of a measurement cell. In the Couette flow, the friction of aggregates on the cell walls causes their deviation from the applied magnetic field through an angle determined by the velocity of the relative motion of the walls. For large enough velocities, the aggregates are detached from the wall and are destroyed by viscous forces. It is shown that the friction of aggregates on cell walls results in the initial increasing and decreasing part of the N-shaped rheogram, while the flow after the detachment of aggregates corresponds to its right increasing part.

Author keywords:

ELECTRORHEOLOGICAL FLUIDS; YIELD-STRESS

DOI:

10.1134/S1063776114040086

Web of Science ID:

ISI:000338340800014

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAY
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1090-6509
Keywords-Plus	ELECTRORHEOLOGICAL FLUIDS; YIELD-STRESS
Research-Areas	Physics
Web-of-Science-Categories	Physics, Multidisciplinary
Author-Email	andrey.zubarev@usu.ru
Funding-Acknowledgement	Russian Foundation for Basic Research {[}12-01-00132, 13-02-91052, 13-01-96047, 14-08-0023]; Ministry of Education and Science of the Russian Federation {[}02.A03.21.0006]; Ural Federal University {[}02.A03.21.0006]
Funding-Text	This work was supported by the Russian Foundation for Basic Research (project nos. 12-01-00132, 13-02-91052, 13-01-96047, and 14-08-0023) and the Agreement no. 02.A03.21.0006 between the Ministry of Education and Science of the Russian Federation and the Ural Federal University (signed 27.08.2013).
Number-of-Cited-References	24
Usage-Count-Since-2013	3
Journal-ISO	J. Exp. Theor. Phys.
Doc-Delivery-Number	AK3QW