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

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 se...

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Bibliographic Details
Published in:Journal of rheology (New York : 1978) 2020-03, Vol.64 (2), p.395-403
Main Authors: Clavaud, Cécile, Metzger, Bloen, Forterre, Yoël
Format: Article
Language:English
Subjects:
Condensed Matter
Engineering Sciences
Fluids mechanics
Instrumentation and Detectors
Mechanics
Physics
Soft Condensed Matter
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Summary: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 (nonshear-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.
ISSN:0148-6055
1520-8516
DOI:10.1122/1.5135370