Abstract: Cohesive particles tend to bond together during fluidization due to the inter-particle force, which breaks down the normal fluidization and seriously affects factory production. In recent years, the research focus of cohesive granular flow has gradually transferred to the intrinsic agglomeration mechanisms and fluidization characteristics simulation study from the black-box-like experiments before. Taking studied scale as the cut-in point, the mechanical model, agglomeration criterion as well as fluidization experiment and simulation study of four kinds of cohesive forces (Van der Waals force, electrostatic force, solid bridge force and liquid bridge force) were reviewed on the particle scale and reactor scale. The functionary mechanisms of cohesive force and the fluidization behavior of cohesive particles were analyzed from the aspects of force, motion and kinetics. While the development of the four kinds of cohesive forces are in different stage according to the agglomeration mechanisms studies, the dynamic model as well as agglomeration process mechanisms will become the major tendency in this field. On the reactor scale, the discrete element method simulation coupled with cohesive force models will remain to play an important role in fluidization study. For the significant influence on simulation performance caused by the accuracy of the model like cohesive force model and drag model as well as the trends in three-dimensional simulation, the mechanical model and calculation ability will be two challenges in the future simulation research.

Key words: granular flow, cohesive force, agglomeration mechanisms, fluidization, discrete element method

摘要： 黏性力的存在导致黏性颗粒在流化过程中易发生团聚，干扰正常的流态化。近年来，黏性颗粒流的研究重心逐渐转移到本征的团聚机理和流化特性。本工作综述了4种主要黏性力的力学模型、团聚判据及流态化实验与模拟研究进展，从力、运动及动力学的角度阐述了黏性力作用机制和黏性颗粒流化特性。分析表明，在颗粒尺度上，4种黏性力发展程度差异较大，黏性力动力学模型和团聚过程机理将成为未来研究的主要方向。在反应器尺度上，耦合黏性力模型的离散单元法模拟将继续作为重要的研究方法，其中，机理模型和计算能力是后续模拟中需要突破的重点。

关键词: 颗粒流, 黏性力, 团聚机理, 流态化, 离散单元法