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Computational Fluid Dynamics–Discrete Element Method Studies on Dynamics and Segregation in Spouted Bed with Polydispersed Particles
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-24 , DOI: 10.1021/acs.iecr.2c00712 Ritesh Raman 1 , Palash Kumar Mollick 2 , Partha S. Goswami 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-06-24 , DOI: 10.1021/acs.iecr.2c00712 Ritesh Raman 1 , Palash Kumar Mollick 2 , Partha S. Goswami 1
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The computational fluid dynamics–discrete element method (CFD–DEM) technique has been used to investigate the translational and rotational dynamics of polydispersed particles in a pseudo-two-dimensional spouted bed. Minimum spouting velocity is predicted numerically and compared with the experimental measurements. The mean particle-phase translational and angular velocities have been computed and compared for finer and coarser particles. The dynamics of the polydispersed particles have been compared with monosize particles having an equivalent Sauter mean diameter. In the polydispersed bed, particles with lower diameters spread up to the wall of the spout setup, leading to a reduction in a particle-free zone away from the core. Segregation of the finer and the coarser particles has been assessed for different superficial gas velocities. The bigger particles are concentrated in the central part of the bed, and their concentration decreases laterally from the spout to the annulus region. An increased concentration of finer particles is observed near the wall. The extent of near-wall segregation decreases with an increase in gas velocity.
中文翻译：
计算流体动力学-离散元法研究多分散颗粒喷射床动力学和偏析
计算流体动力学-离散元法 (CFD-DEM) 技术已被用于研究伪二维喷射床中多分散粒子的平移和旋转动力学。以数值方式预测最小喷流速度并与实验测量值进行比较。已经计算并比较了更细和更粗的粒子的平均粒子相平移速度和角速度。已将多分散颗粒的动力学与具有等效 Sauter 平均直径的单尺寸颗粒进行了比较。在多分散床中，直径较小的颗粒向上扩散到喷口装置的壁上，导致远离核心的无颗粒区减少。已经针对不同的表观气体速度评估了较细和较粗颗粒的分离。较大的颗粒集中在床的中心部分，它们的浓度从喷口到环形区域横向降低。在壁附近观察到更细颗粒的浓度增加。近壁偏析的程度随着气体速度的增加而减小。
更新日期：2022-06-24
中文翻译：
计算流体动力学-离散元法研究多分散颗粒喷射床动力学和偏析
计算流体动力学-离散元法 (CFD-DEM) 技术已被用于研究伪二维喷射床中多分散粒子的平移和旋转动力学。以数值方式预测最小喷流速度并与实验测量值进行比较。已经计算并比较了更细和更粗的粒子的平均粒子相平移速度和角速度。已将多分散颗粒的动力学与具有等效 Sauter 平均直径的单尺寸颗粒进行了比较。在多分散床中，直径较小的颗粒向上扩散到喷口装置的壁上，导致远离核心的无颗粒区减少。已经针对不同的表观气体速度评估了较细和较粗颗粒的分离。较大的颗粒集中在床的中心部分，它们的浓度从喷口到环形区域横向降低。在壁附近观察到更细颗粒的浓度增加。近壁偏析的程度随着气体速度的增加而减小。
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