Heap corrugation and hexagon formation of powder under vertical vibrations.
@article{Falcon1999HeapCA,
title={Heap corrugation and hexagon formation of powder under vertical vibrations.},
author={Eric Falcon and K. Kumar and Kapil Bajaj and Jayanta K. Bhattacharjee},
journal={Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics},
year={1999},
volume={59 5 Pt B},
pages={
5716-20
}
}We report free-surface instabilities in a deep bed of fine granular material of irregular shape under vertical vibrations. At low frequency of vibration, the conical heap due to convective flow becomes unstable above a critical amplitude of vibration and acquires an azimuthal dependence which makes the heap surface corrugated. At even higher amplitude, the heap is no longer stable and splits into small heaps on a hexagonal lattice. At high frequency, we observe standing waves (stripes) at the…
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