Microscopic mechanism for the shear-thickening of non-Brownian suspensions

Abstract

We propose a simple model, supported by contact-dynamics simulations as well as rheology and friction measurements, that links the transition from continuous to discontinuous shear-thickening in dense granular pastes to distinct lubrication regimes in the particle contacts. We identify a local Sommerfeld number that determines the transition from Newtonian to shear-thickening flows, and then show that the suspension's volume fraction and the boundary lubrication friction coefficient control the nature of the shear-thickening transition, both in simulations and experiments.

References in corpus (6)

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• Shear thickening of cornstarch suspensions as a re-entrant jamming transition
• Shear thickening and migration in granular suspensions
• Shear thickening of cornstarch suspensions
• Velocity oscillations in confined channel flows of concentrated colloidal suspensions
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