Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1999-12-02
Physics
Condensed Matter
Disordered Systems and Neural Networks
7 pages, four postscript figures, submitted PRL 11/19/99
Scientific paper
10.1103/PhysRevLett.84.5126
We observe ripples forming on the surface of a granular powder in a container submitted from below to a series of brief and distinct shocks. After a few taps, the pattern turns out to be stable against any further shock of the same amplitude. We find experimentally that the characteristic wavelength of the pattern is proportional to the amplitude of the shocks. Starting from consideration involving Darcy's law for air flow through the porous granulate and avalanche properties, we build up a semi-quantitative model which fits satisfactorily the set of experimental observations as well as a couple of additional experiments.
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