Arch formation mechanism and discharge process of cohesive fine powder in a vibrated silo

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL Particuology Pub Date : 2024-09-12 DOI:10.1016/j.partic.2024.09.001

Jingzhen Zhu , Kun Wang , Yu Ma , Wentao Xu , Jiecai Long , Xiwen Li

引用次数: 0

Abstract

The arch formation mechanism and discharge process of a very cohesive fine powder (calcium carbonate) in a vibrated silo was investigated by experiments and discrete element method (DEM) simulations. An experimental setup is built to study the flow behaviors with the proposed image-based flow rate measurement method. A cohesive DEM model is used to investigate the dynamic behaviors of the powder bed. Results indicate that the arch formation depends on the vibration acceleration amplitude and is slightly affected by the frequency. The powder discharge flow rate increases with vibration acceleration amplitude and decreases with frequency. When the acceleration amplitude exceeds 15 g, the flow rate tends to stabilize. When the acceleration amplitude exceeds 1 g, there is separation and collision between the powder bed and the silo bottom. This collision leads to a significant increase in the contact force.

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振动料仓中粘性细粉的拱形形成机理和卸料过程

通过实验和离散元法（DEM）模拟，研究了极具粘性的细粉（碳酸钙）在振动料仓中的拱形形成机制和排放过程。建立了一个实验装置，利用提出的基于图像的流速测量方法研究流动行为。内聚 DEM 模型用于研究粉末床的动态行为。结果表明，拱形的形成取决于振动加速度的振幅，并受到频率的轻微影响。粉末排出流速随振动加速度振幅的增加而增加，随频率的增加而减少。当加速度振幅超过 15 g 时，流量趋于稳定。当加速度振幅超过 1 g 时，粉末床和料仓底部会发生分离和碰撞。这种碰撞导致接触力显著增加。

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.