Análise de sistemas granulares submetidos a oscilações harmônicas

Abstract

In this work we have used the molecular dynamics techniques to analyze the phenomenon occurring in granular materials known as "brown effect of Brazil," which It constitutes the upward vertical movement of a particle embedded in a medium granules, whose diameter is larger than the maximum particle diameter this means that It is subjected to a simple vertical harmonic motion. Checked that , due to this movement, the granular media particles have a convective flow that depending on the inclination of the container wall, the region may be ascending central container and the descendant lateral region, or vice versa. In the case of the container in the form of straight cylinder, this flow causes the rise of the "Brazil nut" by region Central cylinder until reaching the top of the granular medium, then down by their side and into a cyclic movement around one of the vortexes created in diametrically opposite regions of the cylinder. actual experiments conducted in the laboratory qualitatively confirm the results of computer simulation