Collective motion and solid-liquid-type transitions in vibrated granular layers

Details Collective motion and solid-liquid-type transitions in vibrated granular layers Collective motion and solid-liquid-type transitions in vibrated granular layers

1999-08-17

arxiv.org/abs/cond-mat/9908249v1

Phys. Rev. E 63, 011303 (2001)

Physics

Condensed Matter

LaTex document, 13 pages, 16 ps figures included. Submitted to Physical Review E

Scientific paper

10.1103/PhysRevE.63.011303

From pressure and surface dilation measurements, we show that a solid-liquid-type transition occurs at low excitation frequencies in vertically vibrated granular layers. This transition precedes subharmonic bifurcations from flat surface to standing wave patterns, indicating that these waves are in fact associated with the fluid like behavior of the layer. In the limit of high excitation frequencies, we show that a new kind of subharmonic waves can be distinguished. These waves do not involve any lateral transfer of grains within the layer and correspond to excitations for which the layer slightly bends alternately in time and space. These bending waves have very low amplitude and we observe them in a vibrated two-dimensional layer of photoelastic particles.

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