| Rhéophysique des pâtes et des milieux granulaires |  |
| Rhéophysique des pâtes et des milieux granulaires | |
| HAL : hal-00490742, version 2 |
| arXiv : 1006.1792 |
| DOI : 10.1103/PhysRevLett.105.268303 |
| Fiche détaillée |  Récupérer au format |
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| Physical Review Letters 105 (2010) 268303 |
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| Versions disponibles : | v1 (09-06-2010) | v2 (03-05-2011) |
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| Shear thickening and migration in granular suspensions |
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| Abdoulaye Fall 1, 2Anaël Lemaître 1 |
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| (2010) |
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| We study the emergence of shear thickening in dense suspensions of non-Brownian particles. We combine local velocity and concentration measurements using Magnetic Resonance Imaging with macroscopic rheometry experiments. In steady state, we observe that the material is heterogeneous, and we find that that the local rheology presents a continuous transition at low shear rate from a viscous to a shear thickening, Bagnoldian, behavior with shear stresses proportional to the shear rate squared, as predicted by a scaling analysis. We show that the heterogeneity results from an unexpectedly fast migration of grains, which we attribute to the emergence of the Bagnoldian rheology. The migration process is observed to be accompanied by macroscopic transient discontinuous shear thickening, which is consequently not an intrinsic property of granular suspensions. |
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| 1 : | Laboratoire Navier |
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Ecole des Ponts ParisTech – CNRS : UMR8205 – IFSTTAR |
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| 2 : | University of Amsterdam Van der Waals-Zeeman Institute (VAN DER WAALS-ZEEMAN INSTITUTE) |
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University of Amsterdam |
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| 3 : | Laboratoire de Physique Statistique de l'ENS (LPS) |
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CNRS : UMR8550 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot – Ecole normale supérieure de Paris - ENS Paris |
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| Milieux poreux Rhéophysique |
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| Domaine | : | Physique/Matière Condensée/Matière Molle |
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| Shear thickening – suspension – granular material – migration |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00490742, version 2 | |
| http://hal.archives-ouvertes.fr/hal-00490742 | |
| oai:hal.archives-ouvertes.fr:hal-00490742 | |
| Contributeur : Guillaume Ovarlez | |
| Soumis le : Lundi 2 Mai 2011, 16:19:44 | |
| Dernière modification le : Mardi 3 Mai 2011, 09:03:11 | |
