摘要
采用计算流体力学和离散单元方法对二维提升管气固流动过程进行了数值模拟。采用大涡模拟方法模拟气体湍流流动,采用离散单元方法模拟颗粒碰撞过程。基于网格内流体能量守衡,提出了动能加权平均法,实现Euler坐标与Lagrange坐标的耦合与分解。模拟计算得到的瞬态流型揭示了颗粒聚团的合并和破碎过程及颗粒的详细运动行为,定性地揭示了提升管内气体-颗粒两相流动过程。
The flow behavior of particles in a two-dimensional riser was modeled with the combination of the discrete element method （DEM） and computational fluid dynamics（CFD）.Gas turbulence was modeled by large eddy simulation （LES）,and DEM was used to model the collision of particles.A transport energy weighted averaging approach was proposed to coupling the gas phase in the Euler coordinate with the particles in the Lagrange coordinate on the basis of the balance of the transport kinetic energy.Simulated results showed that the clusters grew in size and increased in number along the flow direction.A core-annulus flow structure with a dilute phase in the center and a dense phase near the walls was formed in the riser.Simulated results showed the formation and break-up of clusters and the motion of particles in the riser.Simulated results were in agreement with available experimental data.However,the comparison with different models of drag force remained rather limited.More detailed simulations are required to get a more complete validation.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第3期565-572,共8页
CIESC Journal
基金
中国博士后基金项目(20090460070)
关键词
提升管
离散单元法
计算流体力学
动能加权平均法
riser
discrete element method
computational fluid dynamics
transport energy weighted averaging scheme
