Granular internal dynamics in a silo discharged with a conveyor belt
Keywords: 
Dry granular material
Coarse-grained field maps
Belt velocity
Kinetic stres
Issue Date: 
2021
Project: 
FIS2014-57325; FIS2017-84631-P
Citation: 
Maza-Ozcoidi, D. (Diego); Gella, D. (Diego); Zuriguel-Ballaz, I. (Iker). "Granular internal dynamics in a silo discharged with a conveyor belt". Journal of Fluid Mechanics. 925 (A24), 2021, 1 - 15
Abstract
The dynamics of granular media within a silo in which the grain velocities are controlled by a conveyor belt has been experimentally investigated. To this end, the building of coarse-grained field maps of different magnitudes has allowed a deep analysis of the flow properties as a function of two parameters: the orifice size and the belt velocity. First, the internal dynamics of the particles within the silo has been fully characterized by the solid fraction, the velocity of the particles and the kinetic stress. Then, the analysis of the vertical profiles of the same magnitude (plus the acceleration) has allowed connection of the internal dynamics with the flow rate. In particular, we show that the gamma parameter – which accounts for the integration of the normalized acceleration along the vertical direction – can successfully discriminate the kind of flow established within the silo (from the quasistatic regime to the free discharge) depending on the outlet size and belt velocity.

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