Periodic, aperiodic, and transient patterns in vibrated granular layers

Umbanhowar P.B.; Swinney, H.L.; Melo F.

Keywords: patterns, phase, layers, acceleration, oscillations, collision, gravitation, vibrations, grain, granular, hexagons, Materials, (mechanical), disordered, Vibrated

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. © 1998 Elsevier Science B.V. All rights reserved."

Más información

Título de la Revista: PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volumen: 249
Número: 1-4
Editorial: Elsevier
Fecha de publicación: 1998
Página de inicio: 1
Página final: 9
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-0032003354&partnerID=q2rCbXpz