Periodic, aperiodic, and transient patterns in vibrated granular layers

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• 作者：Umbanhowar ; Paul B. ; Melo ; Francisco ; Swinney ; Harry L.
• 刊名：Physica A
• 出版年：1998
• 出版时间：February 1, 1998
• 年：1998
• 卷：249
• 期：1-4
• 页码：1-9
• 全文大小：734 K

文摘

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.