弹性恢复系数对超细颗粒气固流场影响的研究

Investigations on Effect of the Restitution Coefficient of Particle Elasticity on Gas and Solid Flow Behavior of Fine Particle Agglomerations in Fluidized Beds

流化床内颗粒非弹性碰撞将影响超细颗粒的流动特性。基于颗粒动理学理论的欧拉-欧拉气固多相流模型,考虑颗粒非弹性碰撞对颗粒碰撞能量交换和耗散的影响,并采用Xu&Zhu颗粒团能量平衡计算模型预测颗粒聚团当量直径,数值模拟流化床内超细颗粒两相流动特性。计算结果表明随着颗粒弹性恢复系数的增加,颗粒间的碰撞脉动变得更加剧烈,流化床内颗粒浓度分布更均匀。

The restitution coefficient of particle elasticity will influence on particle motions. Based on two-fluid flow model combining with the kinetic theory of granular flow, considering the effect of restitution coefficient of particle elasticity to the interaction and energy dissipations of fine particles,and the size of agglomerations was estimated by model proposed by Xu Zhu （2005） from energy balance acting on an agglomerations,flow behavior of fine particle agglomerations in fluid beds was numerically studied. The results of simulation showed that the particle concentration is well-distributed and particle collisions pulse becomes more intense with the increase of the restitution coefficient of particle elasticity.