浸没式超滤膜过滤器内流场的数值模拟.pdf

32 3 ( ) V o l1 32 N o1 3 20 10 6 J o f China T hree G o r ges U niv. ( N atura l Sciences) J un1 2010 李 金 王 泽 ( 河海大学 力学与材料学院, 南京 2 1009 8) 利用计算流体动力学( CF D) 方法对浸没式超滤膜过滤器内的流场进行数值模拟, 通过计算 得 过滤器内流体速度场, 压力场和紊流强度的分布情况, 并针对膜组件放置位置不同, 对3 种方 案进行分析比较. 结果表明, 在过滤器后端壁面处会形成回流区, 影响水流均匀分布; 两膜组件之 间间距较小的情况下, 会降低膜表面的水流紊动强度, 这有利于均匀布水和颗粒的沉积, 从而提高 过滤效率. 浸没式; 超滤膜; 过滤器; 计算流体力学; 数值模拟 T V 13 1. 2 T U 991 A 1672- 948X ( 2010) 03- 00 14- 04 Numerical Simulation of Submerged Ultrafiltration Menbrane Filter Flow Fi el d L i Jin W an g Ze ( Colleg e of M echanics M at er ials , H o hai U niv . , N anjing 210098, China) Abstract T he numerical simulation w as carried o ut on flow r eg im e o f t he submerged ult raf ilt rat ion membrane filt er w it h co mput ational f lu id dynamics ( CFD) t echno logy . T he velocit y f ield, pressure f ield and t urbulence int ensit y h ave been received by com put at ion . F or the membrane m odules placed on diff er ent posit ions , the three opt io ns w ere analy zed and co mpared. T he results show t h at t he dead zone is gener at ed at t he b ack- end w al l of t he f ilter . It can aff ect f low distr ibution . When the distance bet w een t he t w o membrane m odules is com parat ively small; t he fl ow t ur bulence int ensit y is redu ced; and t he bett er f low dist ribut ion and p art icle depo sit io n are pr ovided. T hereby t he f iltrat ion eff iciency is im pro ved . Keywords submerg ed ; ult raf ilt rat ion membrane; f ilter; CFD; num er ical simulat ion , ,