Discontinuous Shear Thickening in Cornstarch Suspensions

We study the emergence of discontinuous shear-thickening (DST) in cornstarch, the well know system for this phenomenon, by combining macroscopic rheometry with local Magnetic Resonance Imaging (MRI) measurements. We bring evidence that macroscopic DST is characterized in wide gap with a shear locali...

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Main Authors: Fall Abdoulaye, Lemaître Anaël, Ovarlez Guillaume
Format: Article
Language:English
Published: EDP Sciences 2017-01-01
Series:EPJ Web of Conferences
Online Access:https://doi.org/10.1051/epjconf/201714009001
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spelling doaj-c1619fb46eff43ca9e7dcfabdb3e29402021-08-02T11:02:37ZengEDP SciencesEPJ Web of Conferences2100-014X2017-01-011400900110.1051/epjconf/201714009001epjconf161865Discontinuous Shear Thickening in Cornstarch SuspensionsFall Abdoulaye0Lemaître Anaël1Ovarlez Guillaume2Laboratoire NAVIER, UMR 8205 CNRS-ENPC-IFSTTARLaboratoire NAVIER, UMR 8205 CNRS-ENPC-IFSTTARCNRS, LOF, UMR 5258We study the emergence of discontinuous shear-thickening (DST) in cornstarch, the well know system for this phenomenon, by combining macroscopic rheometry with local Magnetic Resonance Imaging (MRI) measurements. We bring evidence that macroscopic DST is characterized in wide gap with a shear localization, part of the material close to the inner cylinder is flowing and the rest is not. The flow seperates into a low-density flowing and a high-density jammed region. Moreover, the local rheology of the flowing region does not directly reflect DST but, strikingly, is most often shear-thinning. Our data are not consistent with recent theoretical suggestions based on the presumed existence of s-shaped flow curves. Instead, they support that DST should be attributed to the existence of a shear jamming limit at volume fractions quite significantly below random close packing.https://doi.org/10.1051/epjconf/201714009001
collection DOAJ
language English
format Article
sources DOAJ
author Fall Abdoulaye
Lemaître Anaël
Ovarlez Guillaume
spellingShingle Fall Abdoulaye
Lemaître Anaël
Ovarlez Guillaume
Discontinuous Shear Thickening in Cornstarch Suspensions
EPJ Web of Conferences
author_facet Fall Abdoulaye
Lemaître Anaël
Ovarlez Guillaume
author_sort Fall Abdoulaye
title Discontinuous Shear Thickening in Cornstarch Suspensions
title_short Discontinuous Shear Thickening in Cornstarch Suspensions
title_full Discontinuous Shear Thickening in Cornstarch Suspensions
title_fullStr Discontinuous Shear Thickening in Cornstarch Suspensions
title_full_unstemmed Discontinuous Shear Thickening in Cornstarch Suspensions
title_sort discontinuous shear thickening in cornstarch suspensions
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2017-01-01
description We study the emergence of discontinuous shear-thickening (DST) in cornstarch, the well know system for this phenomenon, by combining macroscopic rheometry with local Magnetic Resonance Imaging (MRI) measurements. We bring evidence that macroscopic DST is characterized in wide gap with a shear localization, part of the material close to the inner cylinder is flowing and the rest is not. The flow seperates into a low-density flowing and a high-density jammed region. Moreover, the local rheology of the flowing region does not directly reflect DST but, strikingly, is most often shear-thinning. Our data are not consistent with recent theoretical suggestions based on the presumed existence of s-shaped flow curves. Instead, they support that DST should be attributed to the existence of a shear jamming limit at volume fractions quite significantly below random close packing.
url https://doi.org/10.1051/epjconf/201714009001
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AT lemaitreanael discontinuousshearthickeningincornstarchsuspensions
AT ovarlezguillaume discontinuousshearthickeningincornstarchsuspensions
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