CFD-DEM investigation of particle dispersion degree on a novel vibrating screen
2022
Li, Yibo | Fan, Hongfei | Xu, Yang | Cui, Tao | Su, Yuan | Qiao, Mengmeng | Han, Shaoyun | Qian, Jun | Zheng, Zhaohui
This work numerically simulates the particle dispersion on a novel vibrating screen by CFD-DEM (Computational Fluid Dynamics coupling Discrete Element Method). Three dispersion indexes are defined to refine the effect of various screening times and areas on particle dispersion features. Impacts of ladder variables of the novel screen on airflow distributions and instantaneous and comprehensive dispersion degrees of particles are investigated. With the ladder angle increasing, airflow velocity increases gradually. Comprehensive dispersion degrees Dₓy and Dₓz of particles perpendicular to and along entire screen surfaces increase initially and then decrease. When the ladder angle is 110°, Dₓy and Dₓz are greater, with 68.53 mm and 68.92 mm. As the ladder length increases, airflow velocity becomes M-shaped and Dₓy and Dₓz increase continuously. When the ladder length is 70 mm, Dₓy and Dₓz are higher, with 72.51 mm and 73.05 mm. These findings guide reducing particle accumulation on planar-linear screens.
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