Experimental observation of the rheology of sediment transported by a laminar flow
Morgane Houssais
(Levich Institute, City College of New York, USA)
| When |
Oct 20, 2015
from 10:45 to 12:00 |
|---|---|
| Where | Centre Blaise Pascal |
| Attendees |
Morgane Houssais |
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Understanding the dynamics of fluid-driven sediment transport remains challenging, as it is an intermediate region between a granular material and a fluid flow. Here we study an idealized laboratory river, we subject a bed of settling plastic particles to a laminar-shear flow from above in an annular flume. We then use Refractive-Index-Matching to track particles' motion and determine local rheology - from the particles flying at the fluid-granular interface to creep deep in the granular bed. From our observations we generalize the Boyer, Guazzelli and Pouliquen [2011] model to account for the weight of a particle by addition of a constant pressure term.