Pattern formation by injection of air in a non-Brownian suspension

Details Pattern formation by injection of air in a non-Brownian suspension Pattern formation by injection of air in a non-Brownian suspension

2005-04-29

arxiv.org/abs/cond-mat/0504783v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 8 figures, to appear in the proceedings of "Powders and Grains 2005"

Scientific paper

We study the injection of air in a granular suspension. We use a linear Hele-Saw cell filled with a suspension which is displaced by air, leading to a Saffman-Taylor (fingering) instability. For the suspension, we use an iso-dense mixture where the fluid and the particles have the same density. The volume fraction of particles can thus be adjusted over a wide range. We discuss the question of an effective rheology inside the cell as well as the pattern formation as a function of the granular compacity. We finally report results on the finger width for stable fingers and the thresholds for their destabilization.

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