Abstract Operating a fluidized bed at elevated pressure is typically used to intensify processes. The effects of pressure on bubble behavior have been extensively studied; however, the gas flow distribution and particle dynamics are much less studied due to difficulties in measurement. In this work, CFD-DEM simulations are conducted to study hydrodynamics in a thin rectangular fluidized bed at pressures increased from 1 bar to 10 bar. The important findings can be summarized as follows. With an increase of pressure, the bubble size and pressure fluctuations decrease. With increasing pressure, the percentage of visible flow of the rising bubbles increases, while the percentage of the gas throughflow through bubbles decreases. At elevated pressures, the solid flow flux and mixing rate are increased. Finally, the reasons of the influence of pressure on fluidization characteristics are explored in view of the increased inertia force on particles and the increased differential pressure on bubbles.

中文翻译：

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使用 CFD-DEM 模拟的薄矩形加压流化床中的气体流动分布和固体动力学

摘要 在高压下操作流化床通常用于强化工艺。压力对气泡行为的影响已被广泛研究；然而，由于测量困难，气体流量分布和粒子动力学研究较少。在这项工作中，CFD-DEM 模拟用于研究薄矩形流化床中压力从 1 bar 增加到 10 bar 的流体动力学。重要的发现可以总结如下。随着压力的增加，气泡尺寸和压力波动减小。随着压力的增加，上升气泡的可见流量百分比增加，而通过气泡的气体通流百分比减少。在升高的压力下，固体流动通量和混合速率增加。最后，