Abstract Computational Fluid Dynamics and Discrete Element Method are used to study the dynamics of a pseudo-2D pulsed fluidized bed, consisting of Geldart B particles. The focus is on the response of the system to variations in the mean gas velocity, VM, and the amplitude of oscillations, VA, at an imposed frequency of 3.5 Hz. Distinctive flow patterns are mapped out based on observation of simulations, pressure fluctuations and bubble granular temperature profiles. A regime transition is observed when VA is varied under constant VM. Such transition is underlined by: a peak in time-averaged pressure drop and coordination number; a change in the dynamics of the solid phase; an increase in velocity of the void fronts traversing the particle bed; and a decrease in minimum average height attained by the solid phase. This is related to the suppression of void layers at higher VA, occurring more easily at lower VM.

中文翻译：

---

使用 CFD-DEM 对脉冲流化床进行数值研究：动力学见解

摘要 计算流体动力学和离散元方法用于研究由 Geldart B 颗粒组成的伪二维脉冲流化床的动力学。重点是系统对平均气体速度 VM 和振荡幅度 VA 变化的响应，施加的频率为 3.5 Hz。基于对模拟、压力波动和气泡颗粒温度分布的观察，绘制出独特的流动模式。当 VA 在恒定 VM 下变化时，观察到状态转变。这种转变强调： 时间平均压降和配位数的峰值；固相动力学的变化；穿过颗粒床的空隙前沿的速度增加；以及由固相获得的最小平均高度的降低。