期刊
NEW JOURNAL OF PHYSICS
卷 24, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac9923
关键词
granular flow; silo flow; granular dynamics; granular materials
资金
- European Union's Horizon 2020 Marie Skodowska-Curie Grant 'CALIPER' [812638]
- Ministerio de Ciencia e Innovacion (Spanish Government) [PID2020-114839GB-I00, MCIN/AEI/10.13039/501100011033]
- NKFIH Hungarian Research Fund [134199, TKP2021-NVA-02]
- Marie Curie Actions (MSCA) [812638] Funding Source: Marie Curie Actions (MSCA)
This study investigates the time evolution of silo discharge for different granular materials, including spherical and elongated grains, using laboratory experiments and discrete element model (DEM) calculations. It is found that spherical grains exhibit a constant discharge rate, while elongated particles show a peculiar flow rate increase for larger orifices before the end of the discharge process. Furthermore, the flow field is practically homogeneous for spherical grains but has strong gradients for elongated particles, with a fast-flowing region in the middle of the silo surrounded by a stagnant zone.
The time evolution of silo discharge is investigated for different granular materials made of spherical or elongated grains in laboratory experiments and with discrete element model (DEM) calculations. For spherical grains, we confirm the widely known typical behavior with constant discharge rate (except for initial and final transients). For elongated particles with aspect ratios between 2 <= L/d <= 6.1, we find a peculiar flow rate increase for larger orifices before the end of the discharge process. While the flow field is practically homogeneous for spherical grains, it has strong gradients for elongated particles with a fast-flowing region in the middle of the silo surrounded by a stagnant zone. For large enough orifice sizes, the flow rate increase is connected with a suppression of the stagnant zone, resulting in an increase in both the packing fraction and flow velocity near the silo outlet within a certain parameter range.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据