【摘要】 采用考虑颗粒脉动流动对气相湍流流动影响的大涡模拟(LES)研究气相湍流,采用直接模拟蒙特卡罗方法(DSMC)模拟颗粒间的碰撞。单颗粒运动满足牛顿第二定律,颗粒相和气相相间作用的双向耦合由牛顿第三定律确定,考虑超细颗粒间的van der Waals作用力。数值模拟垂直管内超细颗粒气固两相流动,对颗粒相速度、浓度以及团聚物流动过程进行分析。更多还原

【Abstract】 Flow behavior of gas/ultra-fine particles two-phase system was investigated by large eddy simulation for gas turbulence and direct simulation Monte Carlo for particles collisions. The Newtonian equations of motion are solved for each individual particle in the system. The two-way coupled of the mutual interactions between particles and gas phase is established by applying the Newton’s third law to discrete particles. The effect of van der Waals force on flow of ultra-fine particles was considered in the simulations. Numerical simulations of ultra-fine particles flow were performed in a riser. The distributions of concentration, velocity of ultra-fine particles and cluster properties were analyzed.更多还原