(Institución)/></a>
				</td>
				<td class= (Institución)
   (Nuevo usuario)
Ayuda  | Contacto  |  Castellano English  
 

Dadun > Depósito Académico > Facultad de Ciencias > Departamento de Física y Matemática Aplicada > DA - Ciencias - Física - Artículos de Revista >

Role of vibrations in the jamming and unjamming of grains discharging from a silo
Autor(es) : Mankoc, C. (C.)
Garcimartin, A. (Ángel)
Zuriguel, I. (Iker)
Maza, D. (Diego)
Pugnaloni, L.A. (Luis A)
Fecha incorporación: 28-jul-2009
Resumen
We present experimental results of the jamming of noncohesive particles discharged from a flat bottomed silo subjected to vertical vibration. When the exit orifice is only a few grain diameters wide, the flow can be arrested due to the formation of blocking arches. Hence, an external excitation is needed to resume the flow. The use of a continuous gentle vibration is a usual technique to ease the flow in such situations. Even though jamming is less frequent, it is still an issue in vibrated silos. There are, in principle, two possible mechanisms through which vibrations may facilitate the flow: i a decrease in the probability of the formation of blocking arches and ii the breakage of blocking arches once they have been formed. By measuring the time intervals inside an avalanche during which no particles flow through the outlet, we are able to estimate the probability of breaking a blocking arch by vibrations. The result agrees with the prediction of a bivariate probabilistic model in which the formation of blocking arches is equally probable in vibrated and nonvibrated silos. This indicates that the second aforementioned mechanism is mainly responsible for improving the flowability in gently vibrated silos.
Enlace permanente: http://hdl.handle.net/10171/4015
Aparece en las colecciones: DA - Ciencias - Física - Artículos de Revista

Ficheros en este registro:
Fichero:  2009.PRE80.pdf
Descripción: 
Tamaño:  201,77 kB
Formato:  Adobe PDF
 Visualizar / Abrir 

Los ítems de Dadun están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.