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Granular particle-shape heterogeneous mixtures discharging through a silo

Published online by Cambridge University Press:  11 February 2021

A. Vamsi Krishna Reddy Open the ORCID record for A. Vamsi Krishna Reddy [Opens in a new window] ,
Sonu Kumar Open the ORCID record for Sonu Kumar [Opens in a new window]  and
K. Anki Reddy Open the ORCID record for K. Anki Reddy [Opens in a new window]
A. Vamsi Krishna Reddy
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati781039, India
Sonu Kumar
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati781039, India
K. Anki Reddy*
Affiliation:
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati781039, India
*
†Email address for correspondence: [email protected]
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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 ($W/d<=10$), 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.

JFM classification

Granular media: Granular media
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 912 , 10 April 2021 , A22
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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Footnotes

‡

Present address: University of Notre Dame, Notre Dame, IN 46556, USA.

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