Discrete particle simulation of particle flow and separation on a vibrating screen: Effect of aperture shape
Discrete particle simulation of particle flow and separation on a vibrating screen: Effect of aperture shape
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DOI：
10.1016/j.powtec.2016.11.004
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发表时间：
2017-06-01
影响因子：
5.2
通讯作者：
Yu, A. B.
中科院分区：
文献类型：
--
作者：
Dong, Kejun;Esfandiary, Amir Hossein;Yu, A. B.
本文采用数值模拟的方法研究了筛孔形状对振动筛中颗粒流动和分离的影响。建立了一个三维离散单元法（DEM）模型来模拟具有不同长宽比和方向的矩形孔的振动筛。在此基础上，通过一系列受控数值试验，研究了筛孔形状对筛分过程的影响。根据不同尺寸颗粒的总通过百分比和沿着筛板的通过百分比分布来分析筛分性能。此外，根据微观动力学信息，特别是颗粒-筛网相互作用，分析单个颗粒的筛分行为。在此基础上，一个单一的尝试的概率和尝试的颗粒通过一个孔的数量建模为不同形状的孔，这是链接到宏观筛分性能。结果是有用的发展孔径形状的筛选效果的基本理解，这将有助于设计，控制和优化实际过程。(C)© 2016 Elsevier B. V.版权所有。
This paper presents a numerical study on the effect of aperture shape on particle flow and separation in a vibrating screen process. A three-dimensional discrete element method (DEM) model is developed to simulate vibrating screens with rectangular apertures of different aspect ratios and orientations. Based on the model, the effect of aperture shape on the sieving process is studied through a series of controlled numerical experiments. The sieving performance is analysed in terms of overall percentage passings of different sized particles and the distribution of percentage passings along the screen deck. In addition, the sieving behaviour of individual particles is analysed based on the microdynamics information, particularly the particle-screen interactions. On this basis, the probability of a single attempt and the number of attempts for a particle to pass an aperture are modelled for different shaped apertures, which are linked to the macroscopic sieving performance. The results are useful for developing a fundamental understanding of the effect of aperture shape on screening, which will help design, control and optimise practical processes. (C) 2016 Elsevier B.V. All rights reserved.