Volume 87, Number 2, July 2009
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 August 2009|
Unjamming a granular hopper by vibration
Departamento de Física, Facultad de Ciencias, Universidad de Navarra - E-31080 Pamplona, Spain, EU
2 Laboratoire de Physique et Mécanique des Milieux Hétérogènes, associé au CNRS (UMR 7636) l'ESPCI et aux Universités Paris 6 et Paris 7 - 10 rue Vauquelin, 75005 Paris France, EU
Corresponding author: email@example.com
Accepted: 30 June 2009
We present an experimental study of the outflow of a hopper continuously vibrated by a piezoelectric device. Outpouring of grains can be achieved for apertures much below the usual jamming limit observed for non-vibrated hoppers. Granular flow persists down to the physical limit of one grain diameter, a limit reached for a finite vibration amplitude. For the smaller orifices, we observe an intermittent regime characterized by alternated periods of flow and blockage. Vibrations do not significantly modify the flow rates both in the continuous and the intermittent regime. The analysis of the statistical features of the flowing regime shows that the flow time significantly increases with the vibration amplitude. However, at low vibration amplitude and small orifice sizes, the jamming time distribution displays an anomalous statistics.
PACS: 45.70.Ht – Avalanches / 45.70.Mg – Granular flow: mixing, segregation and stratification
© EPLA, 2009
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