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arXiv · patt-sol/9507003

Hexagons, Kinks and Disorder in Oscillated Granular Layers

Francisco Melo·Paul Umbanhowar·Harry L. Swinney
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Abstract

Experiments on vertically oscillated granular layers in an evacuated container reveal a sequence of well-defined pattern bifurcations as the container acceleration is increased. Period doublings of the layer center of mass motion and a parametric wave instability interact to produce hexagons and more complicated patterns composed of distinct spatial domains of different relative phase separated by kinks (phase discontinuities). Above a critical acceleration, the layer becomes disordered in both space and time.

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Francisco Melo, Paul Umbanhowar, Harry L. Swinney. 1995-07-17. Hexagons, Kinks and Disorder in Oscillated Granular Layers. https://doi.org/10.1103/physrevlett.75.3838

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