N-like rheograms of concentrated suspensions of magnetic particles / Lopez-Lopez Modesto T.,Rodriguez-Arco Laura,Zubarev Audrey,Kuzhir Pavel,Iskakova Larisa,Gonzalez-Caballero Fernando // JOURNAL OF RHEOLOGY. - 2016. - V. 60, l. 2. - P. 267-274.

ISSN/EISSN:

0148-6055 / нет данных

Type:

Article

Abstract:

We investigate the rheograms of concentrated suspensions of magnetic particles obtained under imposed shear rate in parallel plate geometry. We show that under magnetic field application the usual trend of the rheogram, i.e., increasing shear stress for the whole range of shear rates, is altered by the appearance of a region in which the shear stress decreases as the shear rate is increased. The existence of this region gives to the rheograms an N-like shape. The two initial regions (preyield regime) of these N-like rheograms present unstable flow, characterized by the oscillation of the shear stress with time for each imposed value of shear rate. We also show that rheograms obtained at different sample thicknesses approximately overlap in the developed flow regime, whereas there is a tendency of the shear stress to increase as the thickness is decreased in the preyield regime. This tendency is likely due to the strengthening of pre-existing particle structures by compression as the gap thickness is decreased. Finally, we analyze the effect of the applied magnetic field strength, H, and demonstrate that the rheograms scale with H-1.5 to a single master curve, for the range of applied magnetic fields under study. (C) 2016 The Society of Rheology.

Author keywords:

MAGNETORHEOLOGICAL FLUIDS; YIELD-STRESS; RHEOLOGY; SHEAR; SLIP; FLOW

DOI:

10.1122/1.4942232

Web of Science ID:

ISI:000372688800006

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAR-APR
Publisher	JOURNAL RHEOLOGY AMER INST PHYSICS
Address	STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
Language	English
Keywords-Plus	MAGNETORHEOLOGICAL FLUIDS; YIELD-STRESS; RHEOLOGY; SHEAR; SLIP; FLOW
Research-Areas	Mechanics
Web-of-Science-Categories	Mechanics
Author-Email	modesto@ugr.es
ResearcherID-Numbers	Lopez-Lopez, Modesto T/K-7327-2012 Rodriguez-Arco, Laura/K-6056-2014
ORCID-Numbers	Lopez-Lopez, Modesto T/0000-0002-9068-7795 Rodriguez-Arco, Laura/0000-0002-5527-7547 Kuzhir, Pavel/0000-0001-7089-6197
Funding-Acknowledgement	MINECO, Spain {[}FIS2013-41821-R]; ERDF, European Union; Ministry of Science and Education of the Russian Federation {[}3.12.2014/K]; Act 211 Government of the Russian Federation {[}02.A03.21.0006]; CNRS/Ural Federal University {[}PICS 6102]; University of Granada; {[}RFFI 13-02-91052]; {[}13-01-96047]; {[}14-08-00283]
Funding-Text	This work was supported by project FIS2013-41821-R, MINECO, Spain (Co-funded by ERDF, European Union); by project 3.12.2014/K, Program of Ministry of Science and Education of the Russian Federation; by the Act 211 Government of the Russian Federation, Contract No. 02.A03.21.0006; by grants of RFFI 13-02-91052, 13-01-96047 (Ural), and 14-08-00283; and by project PICS 6102 CNRS/Ural Federal University. L.R.-A acknowledges financial support from University of Granada.
Number-of-Cited-References	20
Usage-Count-Since-2013	10
Journal-ISO	J. Rheol.
Doc-Delivery-Number	DH3LP