Effect of particle shape on packing fraction and velocity profiles at outlet of a silo

doi:10.1088/1674-1056/aca204

Abstract Many studies on how the particle shape affects the discharge flow mainly focus on discharge rates and avalanche statistics. In this study, the effect of the particle shape on the packing fraction and velocities of particles in the silo discharge flow are investigated by using the discrete element method. The time-averaged packing fraction and velocity profiles through the aperture are systematically measured for superelliptical particles with different blockinesses. Increasing the particle blockiness is found to increase resistance to flow and reduce the flow rate. At an identical outlet size, larger particle blockiness leads to lower velocity and packing fraction at the outlet. The packing fraction profiles display evidently the self-similar feature that can be appropriately adjusted by fractional power law. The velocity profiles for particles with different shapes obey a uniform self-similar law that is in accord with previous experimental results, which is compatible with the hypothesis of free fall arch. To further investigate the origin of flow behaviors, the packing fraction and velocity field in the region above the orifice are computed. Based on these observations, the flow rate of superelliptical particles is calculated and in agreement with the simulated data.

Keywords: superelliptical particles flow rate packing fraction and velocity profiles discrete element method

Received: 01 September 2022
Revised: 01 November 2022
Accepted manuscript online: 11 November 2022

PACS:	47.57.Gc	(Granular flow)
	83.10.Rs	(Computer simulation of molecular and particle dynamics)
	45.50.-j	(Dynamics and kinematics of a particle and a system of particles)

Fund: Project supported by the Science and Technology Program of Guizhou Province, China (Grant No. [2018]1048).

Corresponding Authors: Lin Hu
E-mail: hulin2018@sina.com

Cite this article:

Qing-Qing Gao(高庆庆), Yu-Chao Chen(陈玉超), and Lin Hu(胡林) Effect of particle shape on packing fraction and velocity profiles at outlet of a silo 2023 Chin. Phys. B 32 064702

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Effect of particle shape on packing fraction and velocity profiles at outlet of a silo

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