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Friction law for dense granular flows: application to the motion of a mass down a rough inclined plane
Ist Teil von
Journal of fluid mechanics, 2002-02, Vol.453, p.133-151
Ort / Verlag
Cambridge, UK: Cambridge University Press
Erscheinungsjahr
2002
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The problem of the spreading of a granular mass released at the top of a rough inclined
plane was investigated. The evolution of the avalanche was measured experimentally
from the initiation up to the deposit using a Moiré image-processing technique.
The results are quantitatively compared with the prediction of an hydrodynamic
model based on depth-averaged equations. In the model, the interaction between
the flowing layer and the rough bottom is described by a non-trivial friction force
whose expression is derived from measurements on steady uniform flows. We show
that the spreading of the mass is quantitatively predicted by the model when the
mass is released on a plane free of particles. When an avalanche is triggered on an
initially static layer, the model fails in quantitatively predicting the propagation but
qualitatively captures the evolution.