Particles can appear as catalyst, reactant or product in various gas-liquid-solid three-phase production processes. Slurry bubble column reactors (SBCRs), as a kind of three-phase reactors, are preferred for phase contacting and mixing. However, literature studies concerning the effects of particles on the hydrodynamics of SBCRs are manifold and inconsistent in conclusions. Essentially, the multiscale interactions between particles, turbulent eddies and bubbles determine the reactor performance. This review focuses on revealing the particle effects in SBCRs from the perspective of multiscale mechanisms. Macroscopic hydrodynamic changes due to particle effects in literature are summarized. Dimensionless parameters, including the Stokes number, the solid-to-liquid density ratio, the ratio of particle and liquid characteristic lengths, the contact angle and the particle volume fraction are adopted to evaluate the characteristics of gas-liquid-solid flows. The relationships between particle influencing mechanisms and these parameters are analyzed and determined. Inconsistent experimental results are explained by different ranges of these dimensionless parameters. Moreover, particle effects at the mesoscale and microscale, such as the influence on the bubble dynamics and the pivoting effect on the turbulence energy spectrum, are elaborated. Finally, progress in modeling the SBCRs with consideration of particles effects using the Euler method are introduced. This review aims to improve the overall understanding of the complex hydrodynamics in the SBCRs.

中文翻译：

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颗粒对浆态鼓泡塔反应器中流体动力学的影响：多尺度机制综述

颗粒可以作为催化剂、反应物或产物出现在各种气-液-固三相生产过程中。浆态鼓泡塔反应器（SBCR）作为一种三相反应器，优选用于相接触和混合。然而，关于颗粒对SBCR流体动力学影响的文献研究多种多样，且结论不一致。本质上，颗粒、湍流涡流和气泡之间的多尺度相互作用决定了反应器的性能。本综述重点从多尺度机制的角度揭示SBCR中的粒子效应。总结了文献中由于颗粒效应引起的宏观流体动力学变化。采用斯托克斯数、固液密度比、颗粒与液体特征长度之比、接触角、颗粒体积分数等无量纲参数来评价气液固流动特性。分析并确定了颗粒影响机制与这些参数之间的关系。这些无量纲参数的不同范围可以解释不一致的实验结果。此外，还详细阐述了介观和微观尺度的粒子效应，例如对气泡动力学的影响和对湍流能谱的旋转效应。最后，介绍了使用欧拉方法考虑粒子效应的 SBCR 建模进展。本综述旨在提高对 SBCR 中复杂流体动力学的整体理解。