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Granular particle-shape heterogeneous mixtures discharging through a silo.
Granular particle-shape heterogeneous mixtures discharging through a silo.
- Source :
- Journal of Fluid Mechanics; 4/10/2021, Vol. 912, p1-22, 22p
- Publication Year :
- 2021
-
Abstract
- Process industries often involve handling non-cohesive solid materials which vary in size and shape. A comprehensive understanding of such systems helps in effective handling of industrial operations. Here, we studied heterogeneous mixtures of dumbbells and discs flowing out of a two-dimensional silo using discrete element method simulations. We analysed discharge dynamics of the mixtures in two regimes, namely the free-flow regime ($W/d>=15$) and the interrupted flow regime ($W/d), where $W$ and $d$ are the orifice width and diameter of each of the circles of a dumbbell. One of the intriguing results is a decrease in the flow rate $Q$ of mixtures with an increase in the fraction of dumbbells $X_{db}$ in both of the regimes analysed. This can be attributed to the geometrical interlocking among the particles and a hindrance to the rotation of dumbbells. The time-averaged (coarse-grained) flow fields reveal an increase in the size of the stagnant zone beside the orifice with an increase in $X_{db}$. The stagnant zone hinders the particles flowing next to it, which is another reason for a decrease in $Q$ with an increase in $X_{db}$. In the interrupted flow regime, we investigated clogged states of the mixtures using arch morphology, the fraction of dumbbells and number of particles in an arch, and avalanche sizes. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00221120
- Volume :
- 912
- Database :
- Complementary Index
- Journal :
- Journal of Fluid Mechanics
- Publication Type :
- Academic Journal
- Accession number :
- 149512567
- Full Text :
- https://doi.org/10.1017/jfm.2020.1071