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

doi:10.1088/1674-1056/aca204

中国物理B ›› 2023, Vol. 32 ›› Issue (6): 64702-064702.doi: 10.1088/1674-1056/aca204

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

Qing-Qing Gao(高庆庆)¹, Yu-Chao Chen(陈玉超)², and Lin Hu(胡林)^1,†

1 College of Physics, Guizhou University, Guiyang 550025, China;
2 Department of Civil Engineering, Nanyang Normal University, Nanyang 473061, China

收稿日期:2022-09-01 修回日期:2022-11-01 接受日期:2022-11-11 出版日期:2023-05-17 发布日期:2023-05-30
通讯作者: Lin Hu E-mail:hulin2018@sina.com
基金资助:
Project supported by the Science and Technology Program of Guizhou Province, China (Grant No. [2018]1048).

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

Qing-Qing Gao(高庆庆)¹, Yu-Chao Chen(陈玉超)², and Lin Hu(胡林)^1,†

1 College of Physics, Guizhou University, Guiyang 550025, China;
2 Department of Civil Engineering, Nanyang Normal University, Nanyang 473061, China

Received:2022-09-01 Revised:2022-11-01 Accepted:2022-11-11 Online:2023-05-17 Published:2023-05-30
Contact: Lin Hu E-mail:hulin2018@sina.com
Supported by:
Project supported by the Science and Technology Program of Guizhou Province, China (Grant No. [2018]1048).

摘要/Abstract

摘要： 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.

关键词: superelliptical particles, flow rate, packing fraction and velocity profiles, discrete element method

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.

Key words: superelliptical particles, flow rate, packing fraction and velocity profiles, discrete element method

中图分类号: (Granular flow)

47.57.Gc

83.10.Rs (Computer simulation of molecular and particle dynamics) 45.50.-j (Dynamics and kinematics of a particle and a system of particles)

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[J]. 中国物理B, 2023, 32(6): 64702-064702.

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[J]. Chin. Phys. B, 2023, 32(6): 64702-064702.

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

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

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