喷动床环隙区内颗粒流的数学模型和仿真

作     者：李水清 姚强 赵香龙 

作者机构：清华大学热能工程系煤的清洁燃烧国家重点实验室北京100084 

出 版 物：《化工学报》 (CIESC Journal)

年 卷 期：2004年第55卷第2期

页      面：284-289页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

基　　金：国家自然科学基金资助项目 (No . 5 0 3 0 60 12 ) 国家重点基础研究发展规划项目 (No . 2 0 0 2CB2 1160 0 )~~ 

主　　题：喷动床 环隙区 颗粒流 运动学理论 塑性理论 循环速率 

摘      要：Solids motion in the annulus of a spouted bed can be considered as a quasi-static deforming flow similar to that in a silo. Several simplified granular-flow models by Sullivan et al. including kinematic, potential and plastic theory, are investigated in this paper. The model of solids circulation by Morgan et al is combined with the above granular models to predict solids axial velocity in annulus. The finite element method is adopted and the complicated spout-annulus shape geometry is especially considered. Simulated results are compared with experimental data from He et al. It indicates that kinematic theory agrees well with experiments. The regressed kinematic constant B for annulus flow is greatly larger than that for silo flow. Potential theory obtains similar result with kinematic theory, but is incomplete in its physical significance. Plastic theory gives unrealistically oscillatory solution because of the over simplification of stress field. Finally, the Euler equations coupling the momentum transfer of solids with the frictional stress field are proposed for future study.