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开展了柱锥形气固流动特性的CFD-DEM耦合三维数值模拟研究。气相场采用基于欧拉坐标体系的k-ε双方程湍流模型,固相场采用基于拉格朗日坐标体系的DEM直接数值模拟方法,跟踪离散颗粒场的每一个颗粒,考虑颗粒与颗粒(壁面)之间的碰撞力、曳力、重力、Magnus升力、saffman升力。颗粒之间的碰撞采用Hertz-Mindlin无滑移模型计算。模拟对象为柱锥形喷动床,其直径为0.152 m,喷口直径为0.019 m,模拟颗粒数22万,探讨了喷动床中射流随时间的发展,不同气速下床内气固流动结构,以及颗粒速度与颗粒浓度的分布,并与实验数据进行了对比。
CFD-DEM coupled three-dimensional numerical simulation of the columnar gas-solid flow characteristics was carried out. The k-ε turbulence model based on Eulerian coordinate system is adopted in the gas phase field. The DEM direct numerical simulation method based on the Lagrange coordinate system is adopted in the solid phase field to track every particle in the discrete particle field. The particle and particle ) Collision force, drag, gravity, Magnus lift, saffman lift. Collisions between particles were calculated using the Hertz-Mindlin non-slip model. The simulation object is a column conical spouted bed with a diameter of 0.152 m, a spout diameter of 0.019 m and a simulation particle number of 220,000. The development of jets in a spouted bed with time is discussed. The gas-solid flow structure , And the particle velocity and particle concentration distribution, and compared with the experimental data.