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Updated: Dec 26, 2025

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics
Published on: August 27, 2013
Granular flow through an aperture: Influence of obstacles near the outlet
M G Areán1, A Boschan2, M A Cachile2
1Grupo de Medios Porosos, Fac. de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, (C1063ACV) Buenos Aires, Argentina.
Abstract:
We study how the presence of obstacles in a confined system of monodisperse disks affects their discharge through an aperture. The disks are driven by a horizontal conveyor belt that moves at constant velocity. The mean packing fraction at the outlet decreases as the distance between the obstacles and the aperture decreases. The obstacles organize the dynamics of the stagnant zones in two characteristic behaviors that differ mainly in the magnitude of the fluctuations of the fraction of stagnant disks in the system. It is shown that the effective aperture is reduced by the presence of obstacles.
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