A Numerical Simulation of Separation of Crop Seeds by Screening—Effect of Particle Bed Depth
A Numerical Simulation of Separation of Crop Seeds by Screening—Effect of Particle Bed Depth
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DOI：
10.1205/09603080252938744
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发表时间：
2002-06
影响因子：
4.6
通讯作者：
J. Li;C. Webb;S. Pandiella;G. Campbell
中科院分区：
文献类型：
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作者：
J. Li;C. Webb;S. Pandiella;G. Campbell
谷物和作物种子的有效分离和分级在优质谷物食品的生产中具有重要意义。本文采用离散元法（DEM）模拟技术，对农作物种子筛分过程进行了二维数值模拟研究。对振动筛分离大豆和芥菜两种常见农作物种子进行了计算实验。讨论了不同给料速率下的筛分速率和所需筛长与筛上离散颗粒运动的关系。研究表明，颗粒床层深度对筛分效率有着至关重要的影响。对于包含颗粒物料的筛分系统，通过离散元模拟可以确定最有效筛分操作的临界进料速率。
Effective separation and grading of cereal grains and crop seeds are of importance in the production of quality cereal foods. This paper presents a two-dimensional numerical study of the separation process of crop seeds by screening, using the Discrete Element Method (DEM) modelling technique. Computational experiments have been conducted for the separation of two common crop seeds, soybeans and mustard seeds, using a vibrating screen. The screening rate and the required screen length at different feeding rates are discussed in relation to the discrete particle motion on the screen. This study has demonstrated the crucial effect of particle bed depth on screening efficiency. For a screening system involving granular materials, the critical feeding rate for the most effective screening operation can be determined via conducting the DEM simulation.