Yield stress in ferrofluids / Zubarev A. Yu.,Iskakova L. Yu. // MAGNETOHYDRODYNAMICS. - 2007. - V. 43, l. 1. - P. 3-15.

ISSN/EISSN:

0024-998X / нет данных

Type:

Article

Abstract:

Results of theoretical study of quasi-elastic behaviour of a ferrofluid, filling a thin flat gap, exposed to a perpendicular magnetic field are presented. When the field exceeds a certain critical magnitude, magnetic particles form dense discrete. domains (bridges) elongate along the field and link the gap boundaries. Due to these bridges, the ferrofluid exhibits quasi-elastic properties with respect to the shear strain in the plane of the gap. When a mechanical stress imposed on the gap wall exceeds a critical magnitude, the quasi-elastic regime of file ferrofluid rheological behaviour transforms to a regime of viscous flow. We estimated die yield stress dependence on the applied magnetic field and on the thickness of the gap. Analysis shows that at least two microscopic mechanisms of the transition front elastic to fluid theological behaviour of the magnetic fluid axe possible. The first one is determined by the loss of mechanical equilibrium of the domains tilted because of the shear strain to the applied field. The second mechanism is related to the split of each bridge into two separate drops with a length approximately twice as short as the gap thickness. Estimates show that for real ferrofluids the second mechanism is more probable.

Author keywords:

DYNAMICAL PROPERTIES; FLUIDS

DOI:

нет данных

Web of Science ID:

ISI:000254927700001

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN-MAR
Publisher	UNIV LATVIA INST PHYSICS
Address	MIERA 32, SALASPILS, LV-2169, LATVIA
Language	English
Keywords-Plus	DYNAMICAL PROPERTIES; FLUIDS
Research-Areas	Mechanics; Physics
Web-of-Science-Categories	Mechanics; Physics, Fluids \& Plasmas
ResearcherID-Numbers	Zubarev, Adrey/B-4752-2014
Number-of-Cited-References	22
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	4
Journal-ISO	Magnetohydrodynamics
Doc-Delivery-Number	287OZ