Role of defects in the onset of wall-induced granular convection

Abstract

We investigate the onset of the wall-induced convection in vertically vibrated granular matter by means of experiments and two-dimensional computer simulations. In both simulations and experiments we find that the wall-induced convection occurs inside the bouncing bed region of the parameter space in which the granular bed behaves like a bouncing ball. A good agreement between experiments and simulations is found for the peak vibration acceleration at which convection starts. By comparing the results of simulations initialised with and without defects, we find that the onset of convection occurs at lower vibration strengths in the presence of defects. Furthermore, we find that the convection of granular particles initialised in a perfect hexagonal lattice is related to the nucleation of defects and the process is described by an Arrhenius law.

arXiv comment7 pages, 6 figures

References in corpus (7)

• The Reverse Brazil Nut Problem: Competition between Percolation and Condensation
• Size separation in vibrated granular matter
• Mechanisms in the size segregation of a binary granular mixture
• Phase Diagram of Vertically Shaken Granular Matter
• Size segregation and convection
• Heap Formation in Granular Media
• Shock wave propagation in vibrofluidized granular materials

Cited by in corpus (4)

• Geometry-controlled phase transition in vibrated granular media
• Radar for tracer particles
• Internal and surface waves in vibrofluidized granular materials: Role of cohesion
• Clustering and melting in a wet granular monolayer