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黏性颗粒间存在较强的范德华力、液体桥力、静电力等黏附力作用,在流态化时易发生聚团现象,影响流化床的正常操作.连续介质模型、离散颗粒模型和拟颗粒模型用于研究颗粒聚团流态化行为时各有优缺点.基于欧拉方法的连续介质模型无法具体描述颗粒间的相互作用;采用拉格朗日法则能从颗粒微观受力、颗粒碰撞、聚团流动等多尺度研究黏性颗粒的流态化特性.但受限于巨大的运算量,离散颗粒模型模拟的颗粒数有限,拟颗粒模型目前仅适合处理纳微尺度问题.随着高性能计算机的发展和普及,基于拉格朗日法的黏性颗粒流动模型应用前景广阔.
Cohesive particles have strong van der Waals forces, liquid bridge force, electrostatic force and other adhesion force, prone to agglomeration in the fluidized state, affecting the normal operation of the fluidized bed. Continuous medium model, the discrete particle model and the proposed The particle model has its own advantages and disadvantages when it comes to studying the fluidization behavior of particle agglomeration. The continuum model based on the Eulerian method can not describe the interaction between the particles in detail. , And conglomeration flow, but the fluidized properties of the viscous particles are limited by the huge amount of computation, the discrete particle model simulates the limited number of particles, and the pseudo-particle model is only suitable for the treatment of nano-scale problems at present. The development and popularization of performance computer, the viscous particle flow model based on Lagrangian method has wide application prospect.