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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2017-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://doi.org/10.1051/epjconf/201714009001 |
| _version_ | 1819125415824850944 |
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| author | Fall Abdoulaye Lemaître Anaël Ovarlez Guillaume |
| author_facet | Fall Abdoulaye Lemaître Anaël Ovarlez Guillaume |
| author_sort | Fall Abdoulaye |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-22T07:39:47Z |
| format | Article |
| id | doaj.art-c1619fb46eff43ca9e7dcfabdb3e2940 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-22T07:39:47Z |
| publishDate | 2017-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-c1619fb46eff43ca9e7dcfabdb3e29402022-12-21T18:33:47ZengEDP 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 |
| spellingShingle | Fall Abdoulaye Lemaître Anaël Ovarlez Guillaume Discontinuous Shear Thickening in Cornstarch Suspensions EPJ Web of Conferences |
| title | 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_short | Discontinuous Shear Thickening in Cornstarch Suspensions |
| title_sort | discontinuous shear thickening in cornstarch suspensions |
| url | https://doi.org/10.1051/epjconf/201714009001 |
| work_keys_str_mv | AT fallabdoulaye discontinuousshearthickeningincornstarchsuspensions AT lemaitreanael discontinuousshearthickeningincornstarchsuspensions AT ovarlezguillaume discontinuousshearthickeningincornstarchsuspensions |