Model for subharmonic waves in granular materials

Cerda, E.; Melo F.; Rica, S

Abstract

Parametric waves arise spontaneously when a thin layer of granular material is oscillated vertically. A dynamical model of these waves accounting for the observed instability threshold and appearance of square patterns is presented. The proposed instability mechanism is due to two competing processes: a focusing effect that concentrates particles in space, and a diffusion effect that relaxes large thickness gradients in the layer. When the layer is in a liquid-type state, close to a solid-liquid transition, the model correctly predicts the presence of oscillons recently reported by P. Umbanhowar et al.

Más información

Título de la Revista: PHYSICAL REVIEW LETTERS
Volumen: 79
Número: 23
Editorial: American Physical Society
Fecha de publicación: 1997
Página de inicio: 4570
Página final: 4573
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-0001559753&partnerID=q2rCbXpz