Abstract This study presents a Computational Fluid Dynamics–Discrete Element Method (CFD-DEM) model to simulate the interaction and approach of a particle swarm to a stationary bubble for various solid fractions (0.01 ≤ ep ≤ 0.25) and bubble Reynolds numbers (50 ≤ Reb ≤ 200). It was observed that the collision efficiency decreased with increasing the solid fraction until achieving a plateau value. This plateau was attributed to the increase in the lateral expansion of the swarm and particle velocities. The former effect decreased the collision by interception, while the latter increased the inertial effects. However, when the bubble Reynolds number increased, the particle swarm did not have enough time to accelerate or deform before reaching the bubble, and thus, the collision efficiency became insensitive to the solid fraction. The modelling approach presented provides a framework to manage the complexity of particle-bubble interactions in a multiple-particle system.

中文翻译：

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粒子群与静止气泡之间相互作用的 CFD-DEM 研究：粒子-气泡碰撞效率

摘要 本研究提出了一种计算流体动力学 - 离散元方法 (CFD-DEM) 模型来模拟粒子群在各种固体分数 (0.01 ≤ ep ≤ 0.25) 和气泡雷诺数 (50 ≤ Reb ≤ 200)。观察到碰撞效率随着固体分数的增加而降低，直到达到平台值。这个高原归因于群和粒子速度的横向扩展的增加。前者通过拦截减少了碰撞，而后者增加了惯性效应。然而，当气泡雷诺数增加时，粒子群在到达气泡之前没有足够的时间加速或变形，因此碰撞效率对固体部分变得不敏感。