Periodic, aperiodic, and transient patterns in vibrated granular layers

Paul B. Umbanhowar, Francisco Melo and Harry L. Swinney

Physica A: Statistical Mechanics and its Applications, 1998, vol. 249, issue 1, 1-9

Abstract: Experiments on vertically vibrated granular layers in evacuated containers reveal a variety of patterns for acceleration amplitudes above a critical value (≈2.5g). Stripes, squares, hexagons, spirals, triangles, and targets, as well as particle-like localized excitations (“oscillons”) and fronts (“kinks”) between regions with different vibrational phase are observed as the layer depth and the container oscillation frequency and amplitude are varied. A zig-zag instability, unstable hexagons, phase-disordered patterns, and “two-phase” squares are also observed. With a few noteworthy exceptions, the patterns are essentially independent of the lateral boundary conditions.

Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:249:y:1998:i:1:p:1-9

DOI: 10.1016/S0378-4371(97)00425-1

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