CFD-DEM study of effect of bed thickness for bubbling fluidized beds

作     者：Tingwen Li Pradeep Gopalakrishnan Rahul Garg Mehrdad Shahnam 

作者机构：National Energy Technology LaboratoryDepartment of EnergyMorgantownWV26505USA URS CorporationMorgantownWV26505USA Department of Mechanical EngineeringVirginia TechBlacksburgVA 24061USA 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2012年第10卷第5期

页      面：532-541页

核心收录：

学科分类：080706[工学-化工过程机械] 080602[工学-钢铁冶金] 08[工学] 0806[工学-冶金工程] 0807[工学-动力工程及工程热物理] 

基　　金：support of the National Energy Technology Laboratory’s ongoing research in advanced numerical simulation of multiphase flow under the RES contract DE-FE0004000 

主　　题：Bubbling fluidized bedCFDWall effectDiscrete element methodPseudo 2DFlow hydrodynamics 

摘      要：The effect of bed thickness in rectangular fluidized beds is investigated through the CFD-DEM simula- tions of small-scale systems. Numerical results are compared for bubbling fluidized beds of various bed thicknesses with respect to particle packing, bed expansion, bubble behavior, solids velocities, and par- ticle kinetic energy. Good two-dimensional （2D） flow behavior is observed in the bed having a thickness of up to 20 particle diameters. However, a strong three-dimensional （3D） flow behavior is observed in beds with a thickness of 40 particle diameters, indicating the transition from 2D flow to 3D flow within the range of 20-40 particle diameters. Comparison of velocity profiles near the walls and at the center of the bed shows significant impact of the front and back walls on the flow hydrodynamics of pseudo-2D fluidized beds. Hence, for quantitative comparison with experiments in pseudo-2D columns, the effect of walls has to be accounted for in numerical simulations.