旋转填充床内微观混合的数值模拟  

NUMERICAL SIMULATION OF MICROMIXING IN ROTATING PACKED BED

作　　者：梁继国[1] 陈建峰[1] 张建文[2] 

机构地区：[1]北京化工大学教育部超重力工程研究中心,北京100029 [2]北京化工大学化学工程学院,北京100029

出　　处：《化工学报》2004年第6期882-887,共6页CIESC Journal

基　　金：高等学校博士点专项科研基金 (No 2 0 0 10 0 10 0 0 4);国家自然科学基金 (No 2 0 2 3 60 2 0 )资助项目~~

摘　　要：旋转填充床作为新型的高效反应传质设备 ,广泛应用于快速反应过程 ,如制备纳米粉体材料 .对旋转填充床内微观混合进行研究 ,有助于进一步认识旋转填充床内高度分散液体微元在填料丝网中的流动行为和分散混合机制 ,为旋转填充床内液液反应混合制备纳米材料提供理论基础 .基于公开文献报道的实验观测结果 ,通过合理假设 ,建立了旋转填充床内微元流动的物理模型 .在该物理模型的基础上 ,结合此前提出的湍流混合与反应模型 ,模拟计算了液体微元经过实验条件下 5 0层丝网填料最终流出填料空间的浓度分布 .由浓度分布得到的微观混合特征指数与实验值进行了对比 。Micromixing in the rotating packed bed (RPB) is extensively used and is a novel reactor for fast reactions such as reactive precipitation to synthesize nanoparticles. The study on micromixing in RPB is crucial in understanding the mixing-diffusion mechanism and the behavior of tiny liquid elements in the packing of RPB, which are the theoretical basis for synthesizing nanoparticles by precipitation in RPB. On the basis of prior studies, a model describing the turbulent micromixing phenomena and reaction process in RPB was presented in accordance with the flow pattern in RPB. By sufficiently taking into account the unique characteristics of tiny liquid elements in RPB, the concentration distribution outside the packing was simulated by modifying the method proposed by the authors. The computational Xs values with the model are in reasonable agreement with the experimental results.

关 键 词：旋转填充床 微观混合 数值模拟 湍流反应 

分 类 号：TK124[动力工程及工程热物理—工程热物理]