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The Darcytron: a pressure-imposed device to probe the frictional transition in shear-thickening suspensions

Abstract : In this paper, we present a new device called the Darcytron, allowing pressure-imposed rheological measurements on dense suspensions made of very small particles, like shear-thickening suspensions. The main idea is to impose and control the particle pressure using a vertical Darcy flow across the settled bed of particles. We first validate the proof of concept of the Darcytron on a standard (non shear-thickening) suspension composed of large glass particles. We then use this new device to investigate the frictional behavior of a model shear-thickening suspension composed of small silica particles. These results provide direct evidence of a transition between a frictionless and a frictional state as the particle pressure is increased, providing support to the recent frictional transition scenario for shear thickening.
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https://hal.archives-ouvertes.fr/hal-02351663
Contributor : Yoel Forterre <>
Submitted on : Wednesday, November 6, 2019 - 2:55:13 PM
Last modification on : Saturday, January 9, 2021 - 3:35:31 AM
Long-term archiving on: : Saturday, February 8, 2020 - 4:43:11 AM

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  • HAL Id : hal-02351663, version 1

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Cécile Clavaud, Bloen Metzger, Yoel Forterre. The Darcytron: a pressure-imposed device to probe the frictional transition in shear-thickening suspensions. 2019. ⟨hal-02351663v1⟩

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