Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102154
Title: N-like rheograms of concentrated suspensions of magnetic particles
Authors: Lopez-Lopez, M. T.
Rodriguez-Arco, L.
Zubarev, A.
Kuzhir, P.
Iskakova, L.
Gonzalez-Caballero, F.
Issue Date: 2016
Publisher: Society of Rheology
Citation: N-like rheograms of concentrated suspensions of magnetic particles / M. T. Lopez-Lopez, L. Rodriguez-Arco, A. Zubarev, et al. — DOI 10.1122/1.4942232 // Journal of Rheology. — 2016. — Vol. 60. — Iss. 2. — P. 267-274.
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 H1.5 to a single master curve, for the range of applied magnetic fields under study. © 2016 The Society of Rheology.
Keywords: MAGNETIC FIELDS
MAGNETISM
OSCILLATING FLOW
SHEAR DEFORMATION
SHEAR FLOW
SHEAR STRESS
SUSPENSIONS (COMPONENTS)
APPLIED MAGNETIC FIELDS
CONCENTRATED SUSPENSION
GAP THICKNESS
MAGNETIC PARTICLE
PARALLEL PLATE GEOMETRY
PARTICLE STRUCTURE
STRESS DECREASE
UNSTABLE FLOWS
SUSPENSIONS (FLUIDS)
URI: http://hdl.handle.net/10995/102154
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85013974344
PURE ID: 736209
ISSN: 1486055
DOI: 10.1122/1.4942232
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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