Flow and clogging in a horizontal silo with a rotary obstacle

doi:10.1088/1674-1056/ac7a19

中国物理B ›› 2023, Vol. 32 ›› Issue (4): 44701-044701.doi: 10.1088/1674-1056/ac7a19

Flow and clogging in a horizontal silo with a rotary obstacle

Cong-Cong Xu(徐聪聪), Qing-Fan Shi(史庆藩), Wei Liu(刘伟)^†, and Ning Zheng(郑宁)^‡

School of Physics, Beijing Institute of Technology, Beijing 100081, China

收稿日期:2022-04-28 修回日期:2022-06-03 接受日期:2022-06-18 出版日期:2023-03-10 发布日期:2023-03-30
通讯作者: Wei Liu, Ning Zheng E-mail:liuwei73150@bit.edu.cn;ningzheng@bit.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11974044).

Flow and clogging in a horizontal silo with a rotary obstacle

Cong-Cong Xu(徐聪聪), Qing-Fan Shi(史庆藩), Wei Liu(刘伟)^†, and Ning Zheng(郑宁)^‡

School of Physics, Beijing Institute of Technology, Beijing 100081, China

Received:2022-04-28 Revised:2022-06-03 Accepted:2022-06-18 Online:2023-03-10 Published:2023-03-30
Contact: Wei Liu, Ning Zheng E-mail:liuwei73150@bit.edu.cn;ningzheng@bit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11974044).

摘要/Abstract

摘要： The external perturbation applied to a silo and the placement of an immobile obstacle before an exit are two common and effective ways to diminish clogging in the hopper/silo flow. Here, we incorporate the local perturbation into a fixed obstacle, and experimentally explore the effects of a rotary obstacle on clogging and the flowing characteristics in the horizontal silo flow driven by a conveyor belt. Even with a low spin rate, the total blocking probability that a particle constructs a stable blocking arch with its neighbors significantly drops. Correspondingly, the average flow rate of the particles through the exit abruptly rises, at least 1 order of magnitude better than that with an immobile obstacle and approaching the flow rate of continuous flow. The rotation enhances the breakage of clogging arches, which is responsible for improving the flowability in the horizontal silo. In addition, there always exists an optimal obstacle position at which the total blocking probability is minimal and the average flow rate peaks, regardless of the spin rate. Finally, clogging is relieved with the increase of the driving velocity of the conveyor belt, showing a "fast is fast" effect that is opposite to the "fast is slow" effect in other systems such as crowd evacuation and gravity-driven hoppers.

关键词: granular flow, clogging, obstacle, rotation

Abstract: The external perturbation applied to a silo and the placement of an immobile obstacle before an exit are two common and effective ways to diminish clogging in the hopper/silo flow. Here, we incorporate the local perturbation into a fixed obstacle, and experimentally explore the effects of a rotary obstacle on clogging and the flowing characteristics in the horizontal silo flow driven by a conveyor belt. Even with a low spin rate, the total blocking probability that a particle constructs a stable blocking arch with its neighbors significantly drops. Correspondingly, the average flow rate of the particles through the exit abruptly rises, at least 1 order of magnitude better than that with an immobile obstacle and approaching the flow rate of continuous flow. The rotation enhances the breakage of clogging arches, which is responsible for improving the flowability in the horizontal silo. In addition, there always exists an optimal obstacle position at which the total blocking probability is minimal and the average flow rate peaks, regardless of the spin rate. Finally, clogging is relieved with the increase of the driving velocity of the conveyor belt, showing a "fast is fast" effect that is opposite to the "fast is slow" effect in other systems such as crowd evacuation and gravity-driven hoppers.

Key words: granular flow, clogging, obstacle, rotation

中图分类号: (Granular flow: mixing, segregation and stratification)

45.70.Mg

47.57.Gc (Granular flow)

Cong-Cong Xu(徐聪聪), Qing-Fan Shi(史庆藩), Wei Liu(刘伟), and Ning Zheng(郑宁). Flow and clogging in a horizontal silo with a rotary obstacle[J]. 中国物理B, 2023, 32(4): 44701-044701.

Cong-Cong Xu(徐聪聪), Qing-Fan Shi(史庆藩), Wei Liu(刘伟), and Ning Zheng(郑宁). Flow and clogging in a horizontal silo with a rotary obstacle[J]. Chin. Phys. B, 2023, 32(4): 44701-044701.

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Flow and clogging in a horizontal silo with a rotary obstacle

Flow and clogging in a horizontal silo with a rotary obstacle

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