非对称陶瓷膜管渗透性能的CFD模拟研究  

Study on permeability of asymmetric ceramic membrane tubes with CFD simulation

作　　者：杨钊[1,2] 程景才[2] 杨超[2] 梁斌[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]中国科学院过程工程研究所,北京100190

出　　处：《化工学报》2015年第8期3120-3129,共10页CIESC Journal

基　　金：国家自然科学基金项目(21490584;21476236);国家高技术研究发展计划项目(2012AA03A606)~~

摘　　要：陶瓷膜因其化学稳定性好、机械强度大等优点得到广泛应用。计算流体力学(CFD)的快速发展使得计算模拟成为研究和优化陶瓷膜管结构性能的有效手段。为了优化非对称结构陶瓷膜管的结构和操作参数,对其渗透性能进行了CFD计算模拟。针对非对称结构陶瓷膜管的膜层和过渡层的厚度在10μm级的特点,采用Navier-Stokes方程和Darcy定律来分别描述膜管内和膜多孔介质内的纯水流动,利用多孔介质模型描述膜管的主体支撑层,用多孔跳跃边界简化膜管的膜层和过渡层,利用Konzey-Carmen方程对膜元件各层的渗透率进行估算。计算结果与实验值吻合较好,为优化陶瓷膜管的通道结构提供了便捷的工具。Ceramic membranes have been widely used in chemical industry on account of their inherently superior physical integrity, chemical resistance and separation performance. Rapid development of computational fluid dynamics （CFD） has made numerical simulation an effective mean of researching and optimizing the structure and permeability of ceramic membrane tubes. In this paper the permeability of asymmetric ceramic membrane tubes was simulated with CFD in order to optimize the ceramic membrane tube structure and operating parameters. The thickness of ceramic top-layer and intermediate-layer of an asymmetrically-structured membrane is about tens of micron, so an effective simplified calculation model is put forward in this work. A porous media model was applied to the porous support of the ceramic membrane tube. The ceramic top-layer and intermediate-layer of the ceramic membrane tube were described with porous jump boundary conditions. The permeability of ceramic membrane was effectively evaluated by the classic Konzey-Carmen （KC） equation. The CFD results showed a good agreement with the experimental data. This quick and easy calculation method provides an effective tool to optimize the structure of membrane tubes.

关 键 词：膜 计算流体力学 渗透 多孔介质 

分 类 号：TQ028.8[化学工程]