侧壁辅助进气微小流化床内纳米颗粒流化特性的数值模拟

基于双流体模型,使用计算流体动力学软件Fluent6.3,对气固微小流化床（床高220 mm,内径20 mm）内侧壁辅助进气纳米颗上流化特性进行了数值模拟,考察了床内固含率和颗粒运动的分布规律,系统地研究了侧壁开孔位置对颗粒流化质量的影响.结果显示：设计向上倾斜角为60.的侧壁辅助进气口距床底10 mm的流化床性能最好,能大大强化床内颗粒的内循环,提高颗粒的离散性,明显抑制颗粒的沟流和粘壁运动.

Numerical Simulation of Fluidization Characteristics of Nanoparticles in Micro-scale Fluidized Beds with Auxiliary Side Intakes

Using the CFD code Fluent 6.2, the characteristics of nanoparticles in micro-scale fluidized beds of 220 mm height and 20 mm inner diamcter with auxiliary side intakes, were numerically simulated with the two-fluid model. Law of nanoparticles movement and solid volume traction are obtained. Effect of the position of intakes in sidewalls on the quality of fluidization of particles was systematically studied. The result shows that micro-scale tluidized beds with auxiliary an upward 60 degrees angle intake from the bottom of 10 mm had the best performance. It significantly strengthened the internal circulation to make particles more discrete and significantly inhibit the channeling and sticking wall motion of particles.