Dynamics and Rheology of Yield Stress Fluids

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• Suzanne Fielding, Durham
• Tuesday 19 November 2019, 13:00-14:00
• MR11, CMS.

If you have a question about this talk, please contact Professor Mike Cates.

Following a pedagogical introduction to yield stress fluids, three recent research results on this topic will be presented. The first concerns the dynamics of dense athermal suspensions in the absence of flow: here we find non-trivial power-law ageing and coarsening dynamics, in a system that had previously been assumed to jam up exponentially quickly following sample preparation. The second concerns the bulk behaviour of yield stress fluids as they yield from an initially solid-like to a finally fluid-like state. Here we demonstrate a smooth cross-over from ductile to brittle-like yielding behaviour as a function of paramaters characterising the initial sample prepration (age, cooling rate, annealing temperature) and imposed shear rate, without the need for a `critical point’ as suggested in the recent literature. The third concerns wall slip, which in experimental practice often dominates the rheological response of yield stress fluids. Here we present a novel simulation technique capable of fully resolving elastohydrodynamic slip at the wall, coupled with bulk dynamics, and present its predictions for slip-dominated rheology.

This talk is part of the DAMTP Statistical Physics and Soft Matter Seminar series.

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• All CMS events
• DAMTP Statistical Physics and Soft Matter Seminar
• MR11, CMS
• Soft Matter
• bld31

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