NUMERICAL SIMULATION OF A SPOUTED BED USING COMPUTATIONAL FLUID DYNAMICS (CFD)
In this paper,computational fluid dynamics (CFD) technology was used to model a spouted bed (SB).The multi-fluid Eulerian–Eulerian approach based on kinetic theory of granular flows and Gidaspow’s drag model for the interaction between gas and particles were applied in the modeling.The effects of the spouted bed properties,i.e.,angle of cone,particle size,cylinder diameter and static bed height of particle,on its dynamics performance were investigated.The simulated results,i.e.,flow pattern of particles,fountain height,voidage and particle velocity of spout zone,were presented.The results showed that periodic fluctuation of spouting appeared in a SB with conical angle of 30°and inlet velocity at 16.6m/s.When the SB cylinder diameter became 0.52m,periodic fluctuation appeared,too.The stable spouting of SB with 90° cone angle could be obtained at inlet air velocity 24.3m/s.Fountain height of particles decreased with the increases of particle size and the static bed height of particles.It was kept at about 0.19m when different SB cylinder diameters in the range of 0.36m to 0.48m were used.In the spouting region,it was seen that the voidage decreased with static particle height in bed,but the velocity of particles increased.For certain particle size,the voidage decreased with increase of particle height,but velocity of particles increased.It was also found that the cylinder diameter didn’t affect the volume fraction of particles except for the cylinder diameter 0.52m and the change of particle velocity was little in spout zone.With the different static bed height of particles used,the voidage and particle velocity have little change at the same level of spout zone.
Spouted bed fountain height flow pattern of particle particle velocity void-age
C.H.Zhang L.X.Huang P.J.Xie F.You A.S.Mujumdar
Institute of Chemical Industry of Forest Products,CAF;National Engineering Lab.Jor Biomass Chemical Institute of Chemical Industry of Forest Products,CAF;National Engineering Lab,Jor Biomass Chemical Department of Mechanical Engineering,National University of Singapore,119260,Singapore
国际会议
The 18th International Drying Symposium Conference(第十八届国际干燥学术大会(IDS2012))
厦门
英文
1-8
2012-01-11（万方平台首次上网日期，不代表论文的发表时间）