喷动床气固流动特性的三维CFD-DEM数值模拟  

DEM Simulation of Flow Behaviors in 3D Spouted Beds

作　　者：任冰[1] 钟文琪[1] 金保昇[1] 袁竹林[1] 陆勇[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《工程热物理学报》2012年第8期1341-1344,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50976025);国家重点基础研究发展计划(973计划)(No.2011CB201505);江苏省普通高校研究生科研创新计划资助项目(No.CXZZ-0148);东南大学优秀博士论文基金(No.YBJJ1107)

摘　　要：开展了柱锥形气固流动特性的CFD-DEM耦合三维数值模拟研究。气相场采用基于欧拉坐标体系的k-ε双方程湍流模型,固相场采用基于拉格朗日坐标体系的DEM直接数值模拟方法,跟踪离散颗粒场的每一个颗粒,考虑颗粒与颗粒(壁面)之间的碰撞力、曳力、重力、Magnus升力、saffman升力。颗粒之间的碰撞采用Hertz-Mindlin无滑移模型计算。模拟对象为柱锥形喷动床,其直径为0.152 m,喷口直径为0.019 m,模拟颗粒数22万,探讨了喷动床中射流随时间的发展,不同气速下床内气固流动结构,以及颗粒速度与颗粒浓度的分布,并与实验数据进行了对比。Three dimensional coupled CFD-DEM simulation was carried out on the cylindrical spouted bed with an inside diameter of 152 mm and a conical base of 60°. The particle motion was modeled by the DEM, and the gas motion was modeled by the k - s turbulent model. Drag force, contact force, Saffman lift force, Magnus lift force and gravitational force were considered in the models. On the basis of the simulation, the development of spout with time, different flow patterns at various gas velocity and the distributions of particle velocity and concentration were studied. The present simulated results were in well agreement with the experiments.

关 键 词：直接数值模拟 气固两相流动 喷动床 颗粒碰撞 

分 类 号：TK051.1[动力工程及工程热物理]