Application of the Discrete Approach to the Simulation of Size Segregation in Granular Chute Flow

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• 作者：Jiayuan Zhang ; Ziguo Hu ; Wei Ge ; Yongjie Zhang ; Tinghua Li ; and Jinghai Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2004
• 出版时间：September 1, 2004
• 年：2004
• 卷：43
• 期：18
• 页码：5521 - 5528
• 全文大小：1005K
• 年卷期：v.43,no.18(September 1, 2004)
• ISSN：1520-5045

文摘

Size segregation is commonly observed in flows of particles with different physical and mechanicalproperties. It can be favorable or undesirable, depending on different industrial processes. Inour case, the size segregation of ore particles in a chute flow is utilized to prepare a well-beddedfeedstock for high sintering quality, and magnets are installed below the chute to enhance sizesegregation. Discrete element method (DEM) simulations are carried out to explore the optimalarrangement of the magnets. The system is reduced to two dimensions, and the irregular oreparticles of continuous size distribution are represented by rough disks of four diameters, withtheir properties reasonably sampled from the sintering materials. The magnetic fields arecalculated using Ansoft in advance, which excludes the influence of the ore layer itself becauseit is weakly magnetic only. The simulations show that the proper magnetic field can significantlyenhance the segregation, and it seems that the component normal to the chute has the dominanteffect on segregation but the tangential component is also critical. The simulation results are ingood agreement with our experiences in the industrial systems designed with consultation tothese results. We suggest that despite major simplifications, the DEM is still an effective toolfor dynamic studies and the design of complex granular flows in mineral processing.