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  Rheology of dense suspensions of elastic capsules: Normal stresses, yield stress, jamming and confinement effects

Gross, M., Krüger, T., & Varnik, F. (2014). Rheology of dense suspensions of elastic capsules: Normal stresses, yield stress, jamming and confinement effects. Soft Matter, 10(24), 4360-4372. doi:10.1039/c4sm00081a.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-C10C-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-C10D-7
Genre: Journal Article

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 Creators:
Gross, Markus1, Author              
Krüger, Timm2, 3, Author              
Varnik, Fathollah4, 5, Author              
Affiliations:
1Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum, Universitaetsstr. 90a, 44789 Bochum, Germany, persistent22              
2Centre for Computational Science, University College London, 20 Gordon Street, London WC1H 0AJ, UK, persistent22              
3Institute for Materials and Processes, School of Engineering, University of Edinburgh King's Buildings, Mayfield Road, Edinburgh EH9 3JL, UK, persistent22              
4Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany, ou_persistent22              
5Theory and Simulation of Complex Fluids, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863393              

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Free keywords: Jamming; Tanks (containers); Viscosity; Yield stress, Confinement effects; Critical volume fractions; Effective medium model; Elastic properties; Normal stress difference; Particle pressure; Repulsive forces; Stress mechanisms, Elasticity, microcapsule, animal; biological model; blood rheology; elasticity; erythrocyte; human; hydrodynamics; mechanical stress; microcapsule; microfluidics; physiology; viscosity, Animals; Capsules; Elasticity; Erythrocytes; Hemorheology; Humans; Hydrodynamics; Microfluidics; Models, Biological; Stress, Mechanical; Viscosity
 Abstract: We study the shearing rheology of dense suspensions of elastic capsules, taking aggregation-free red blood cells as a physiologically relevant example. Particles are non-Brownian and interact only via hydrodynamics and short-range repulsive forces. An analysis of the different stress mechanisms in the suspension shows that the viscosity is governed by the shear elasticity of the capsules, whereas the repulsive forces are subdominant. Evidence for a dynamic yield stress above a critical volume fraction is provided and related to the elastic properties of the capsules. The shear stress is found to follow a critical jamming scenario and is rather insensitive to the tumbling-to-tank- treading transition. The particle pressure and normal stress differences display some sensitivity to the dynamical state of the cells and exhibit a characteristic scaling, following the behavior of a single particle, in the tank-treading regime. The behavior of the viscosity in the fluid phase is rationalized in terms of effective medium models. Furthermore, the role of confinement effects, which increase the overall magnitude and enhance the shear-thinning of the viscosity, is discussed. © 2014 the Partner Organisations.

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Language(s): eng - English
 Dates: 2014-06-28
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c4sm00081a
BibTex Citekey: Gross20144360
 Degree: -

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Title: Soft Matter
  Abbreviation : Soft Matter
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 10 (24) Sequence Number: - Start / End Page: 4360 - 4372 Identifier: ISSN: 1744-683X
CoNE: /journals/resource/1744-683X