Effects of variable airflow on particle motion in spout-fluid beds are studied. Computational fluid dynamics using Navier–Stokes equations for the gas phase coupled with the discrete element method using Newton’s laws for the solid phase have been employed. Results indicate that increasing the fluidizing velocity diminishes dead zones and increases both the total height of the bed and the traversed distance by particles in the steady spout-fluid bed. In pulsed airflows, two configurations are investigated, namely, the spouted pulsed-fluidized bed with pulsed flow of the fluidizing velocity, and the pulsed-spouted fluidized bed with pulsed flow of the spouting velocity. The positive effect of pulsation on particle motion is shown and the effects of parameters, such as amplitude and frequency, on the dynamics of the bed are investigated in each configuration. An increase of up to 19% in traversed distance is found for the range studied, which suggests flow pulsation as a promising technique for increasing particle mixing in spout-fluid beds.

研究了可变气流对喷流床中颗粒运动的影响。气相使用Navier-Stokes方程进行计算流体动力学，固相采用牛顿定律的离散元方法结合使用。结果表明，增加流化速度会减小死区，并增加床的总高度和稳定喷流床中颗粒的穿越距离。在脉冲气流中，研究了两种构造，即具有流化速度的脉冲流的喷射脉冲流化床和具有喷射速度的脉冲流的脉冲喷射流化床。显示了脉动对粒子运动的积极影响，以及诸如振幅和频率之类的参数的影响，在每种配置中研究床的动力学特性。对于所研究的范围，发现遍历距离最多增加19％，这表明流动脉动是增加喷流床中颗粒混合的有前途的技术。