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dc.contributor.author
Nicolas, Alexandre
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dc.contributor.author
Fuchs, Matthias
dc.date.available
2018-09-17T18:46:59Z
dc.date.issued
2016-02
dc.identifier.citation
Nicolas, Alexandre; Fuchs, Matthias; Shear-thinning in dense colloidal suspensions and its effect on elastic instabilities: From the microscopic equations of motion to an approximation of the macroscopic rheology; Elsevier Science; Journal Of Non-newtonian Fluid Mechanics; 228; 2-2016; 64-78
dc.identifier.issn
0377-0257
dc.identifier.uri
http://hdl.handle.net/11336/59931
dc.description.abstract
In the vicinity of their glass transition, dense colloidal suspensions acquire elastic properties over experimental timescales. We investigate the possibility of a visco-elastic flow instability in curved geometry for such materials. To this end, we first present a general strategy extending a first-principles approach based on projections onto slow variables (so far restricted to strictly homogeneous flow) in order to handle inhomogeneities. In particular, we separate the advection of the microstructure by the flow, at the origin of a fluctuation advection term, from the intrinsic dynamics. On account of the complexity of the involved equations, we then opt for a drastic simplification of the theory, in order to establish its potential to describe instabilities. These very strong approximations lead to a constitutive equation of the White-Metzner class, whose parameters are fitted with experimental measurements of the macroscopic rheology of a glass-forming colloidal dispersion. The model properly accounts for the shear-thinning properties of the dispersions, but, owing to the approximations, the description is not fully quantitative. Finally, we perform a linear stability analysis of the flow in the experimentally relevant cylindrical (Taylor-Couette) geometry and provide evidence that shear-thinning strongly stabilises the flow, which can explain why visco-elastic instabilities are not observed in dense colloidal suspensions.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Dense Colloidal Suspensions
dc.subject
Mode-Coupling Theory
dc.subject
Rheology
dc.subject
Viscoelastic Instability
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Shear-thinning in dense colloidal suspensions and its effect on elastic instabilities: From the microscopic equations of motion to an approximation of the macroscopic rheology
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-09-10T15:54:22Z
dc.journal.volume
228
dc.journal.pagination
64-78
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Nicolas, Alexandre. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Université Grenoble Alpes; Francia. Centre National de la Recherche Scientifique; Francia
dc.description.fil
Fil: Fuchs, Matthias. Universität Konstanz; Alemania
dc.journal.title
Journal Of Non-newtonian Fluid Mechanics
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.jnnfm.2015.12.010
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0377025715002190
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