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25 April 2024 |
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Article overview
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Unsteady flow and particle migration in dense, non-Brownian suspensions | | Michiel Hermes
; Ben M. Guy
; Guilhem Poy
; Michael E. Cates
; Matthieu Wyart
; Wilson C. K. Poon
; | | Date: |
25 Nov 2015 | | Abstract: | We present experimental results on dense corn-starch suspensions as examples
of non-Brownian, nearly-hard particles that undergo continuous and
discontinuous shear thickening (CST and DST) at intermediate and high densities
respectively. Our results offer strong support for recent theories involving a
stress-dependent effective contact friction among particles. We show however
that in the DST regime, where theory might lead one to expect steady-state
shear bands oriented layerwise along the vorticity axis, the real flow is
unsteady. To explain this, we argue that steady-state banding is generically
ruled out by the requirement that, for hard non-Brownian particles, the solvent
pressure and the normal-normal component of the particle stress must balance
separately across the interface between bands. (Otherwise there is an
unbalanced migration flux.) However, long-lived transient shear-bands remain
possible. | | Source: | arXiv, 1511.8011 | | Services: | Forum | Review | PDF | Favorites | |
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