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Title:
The maximum angle of stability and angle of repose of wet granular materials
Authors:
Nowak, S. A.; Samadani, A.; Kudrolli, A.
Affiliation:
AA(Dept. of Physics, MIT) AB(Dept. of Physics, MIT) AC(Dept. of Physics, Clark University)
Publication:
American Physical Society, 57th Annual Meeting of the Division of Fluid Dynamics, 21-23 November, 2004, Seattle, Washington, MEETING ID: DFD04., abstract #DH.005
Publication Date:
11/2004
Origin:
APS
Bibliographic Code:
2004APS..DFD.DH005N

Abstract

We investigate the impact of liquids on the maximum angle of stability (θ_m), and the angle of repose of a granular pile in a rotating drum system. The angles are measured by imaging the surface. Both angles are observed to increase and saturate as a function of the volume fraction of the fluid. We first show that the angles are affected by the side walls and higher angles are observed unless a wide drum that is a few hundred times the grain diameter is used. We present a new model which predicts θm of the wet pile in the saturation regime. Our model considers the stability of the beads inside the pile at a plane corresponding to θm for dry beads with the additional cohesive forces between the grains due to liquid bridges. The model is able to reproduce the grain size, surface tension and system size dependence observed in our experiments. We also study the effect of viscosity on the pile using silicone oil with various viscosities but similar surface tension. The viscosity is observed to have no impact on θm but does affect the angle of repose.
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