Convection Rolls and Individual Particles Movements in Horizontally Vibrated Granular Particles System

Abstract

Convection in horizontally vibrated granular systems is significant for scientists and engineers for their importance in the field of mining, geo-physics, and pharmaceutical etc. This research work studied three types of convection rolls, "Homogeneous convection roll", "lower-right diagonal convection roll" and "upper-right diagonal convection roll" which occurred in a square container filled with binary granular particles mixture of sized d = (4.0 ± 0.2) mm and d = (8.0 ± 0.2) mm. Container was vibrated horizontally with low frequencies f and low dimensionless acceleration Γ. Helical movement was observed along the walls perpendicular to direction of motion while straight-line movement along the walls horizontal to direction of motion. Helical and straight-line movements of particles along the walls are the part of convection rolls. A heap appeared due to vibration, which has dominant effect on the convection rolls. Heap position is function of frequency f and dimensionless accelerations Γ.

Regions Development and Convection Motion in Horizontally Vibrated Granular System

“…Granular materials divulge a number of exhilarating phenomena, such as selforganized convection motion and various types of segregation [15][16][17]. Horizontally shaken systems possess complex patterns of convection [18][19][20][21][22]; it is also a stimulating research issue [23][24][25][26][27][28][29]. The transition between solid and fluid states was also witnessed in 2D experiments [30] and simulations [21,[30][31][32].…”