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Wall slip and bulk yielding in soft particle suspensions

Jung, Gerhard and Fielding, Suzanne M. (2021) 'Wall slip and bulk yielding in soft particle suspensions.', Journal of rheology., 65 (2). p. 199.

Abstract

We simulate a dense athermal suspension of soft particles sheared between hard walls of a prescribed roughness profile, fully accounting for the fluid mechanics of the solvent between the particles and for the solid mechanics of changes in the particle shapes. We, thus, capture the widely observed rheological phenomenon of wall slip. For imposed stresses below the material’s bulk yield stress, we show the slip to be dominated by a thin solvent layer of high shear at the wall. At higher stresses, it is augmented by an additional contribution from the fluidization of the first few layers of particles near the wall. By systematically varying the wall roughness, we quantify a suppression of slip with increasing roughness. We also elucidate the effects of slip on the dynamics of yielding following the imposition of constant shear stress, characterizing the timescales at which bulk yielding arises and at which slip first sets in.

Item Type:Article
Full text:Publisher-imposed embargo until 12 February 2022.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1122/8.0000171
Publisher statement:This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (citation of published article) and may be found at https://doi.org/10.1122/8.0000171.
Date accepted:21 January 2021
Date deposited:14 October 2021
Date of first online publication:12 February 2021
Date first made open access:14 October 2021

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