Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-02-18
Physics
Condensed Matter
Soft Condensed Matter
Accepted for publication in PRE on Apr 9, 2010
Scientific paper
10.1103/PhysRevE.81.041309
Granular gravity driven flows of glass beads have been observed in a silo with a flat bottom. A DC high electric field has been applied perpendicularly to the silo to tune the cohesion. The outlet mass flow has been measured. An image subtraction technique has been applied to visualize the flow geometry and a spatiotemporal analysis of the flow dynamics has been performed. The outlet mass flow is independent of voltage, but a transition from funnel flow to rathole flow is observed. This transition is of probabilistic nature and an intermediate situation exists between the funnel and the rathole situations. At a given voltage, two kinds of flow dynamics can occur : a continuous flow or an intermittent flow. The electric field increases the probability to observe an intermittent flow.
Boschini F.
Lumay Geoffroy
Mersch E.
Vandewalle Nicolas
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