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Journal of Rheology / Volume 48 / Issue 6

J. Rheol. 48, 1295 (2004); http://dx.doi.org/10.1122/1.1795171 (26 pages)

Slip and flow in pastes of soft particles: Direct observation and rheology

Steven P. Meeker and Michel Cloitre

Laboratoire Matière Molle et Chimie (UMR 167, ESPCI-CNRS), ESPCI, 10 rue Vauquelin, 75321 Paris Cedex, France

Roger T. Bonnecaze

Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712

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Microgel pastes and concentrated emulsions are shown to exhibit a generic slip behavior at low stresses when sheared near smooth surfaces. The magnitude of slip depends on the applied stress. Well above the yield stress, slip is negligible compared to the bulk flow. Just above the yield stress, slip becomes significant and the total deformation results from a combination of bulk flow and slip. At and below the yield stress, the bulk flow is negligible and the apparent motion is entirely due to wall slip. By directly imaging the deformation of pastes and from rheological measurements, we show that slip is characterized by universal scaling properties, which depend on solvent viscosity, bulk shear modulus, and particle size. A model based on elastohydrodynamic lubrication between the squeezed particles and the shearing surface explains these properties quantitatively. © 2004 The Society of Rheology.

© 2004 The Society of Rheology

KEYWORDS and PACS

Keywords

slip flow, rheology, emulsions, yield stress, deformation, viscosity, shear modulus, particle size, polymer gels, two-phase flow, elastodynamics, hydrodynamics, lubrication, flow visualisation, Slip, Paste, Emulsions, Gel, colloidal, Microgel

PACS

  • 47.45.Gx

    Slip flows and accommodation

  • 82.70.Kj

    Emulsions and suspensions

  • 82.70.Gg

    Gels and sols

  • 47.80.-v

    Instrumentation and measurement methods in fluid dynamics

  • 83.80.Kn

    Physical gels and microgels

  • 47.55.Kf

    Particle-laden flows

  • 66.20.-d

    Viscosity of liquids; diffusive momentum transport

PUBLICATION DATA

ISSN

0148-6055 (print)  

Publisher

The Society of Rheology

RELATED DATABASES

Web of Science

View this record in Web of Science

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ARTICLE DATA

History
Received 02 Mar 04
Revised 09 Jul 04
Digital Object Identifier
http://dx.doi.org/10.1122/1.1795171

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