Nonmonotonic settling of a sphere in a cornstarch suspension


Kann, Stefan von and Snoeijer, Jacco H. and Lohse, Detlef and Meer, Devaraj van der (2011) Nonmonotonic settling of a sphere in a cornstarch suspension. Physical Review E: Statistical, nonlinear, and soft matter physics, 84 (6). 060401. ISSN 1539-3755

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Abstract:Cornstarch suspensions exhibit remarkable behavior. Here, we present two unexpected observations for a sphere settling in such a suspension: In the bulk of the liquid the velocity of the sphere oscillates around a terminal value, without damping. Near the bottom the sphere comes to a full stop, but then accelerates again toward a second stop. This stop-go cycle is repeated several times before the object reaches the bottom. We show that common shear thickening or linear viscoelastic models cannot account for the observed phenomena, and propose a minimal jamming model to describe the behavior at the bottom
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