基于单根膜丝的膜组件内部流场流动分析模拟  

Analysis and simulation of flow field in membrane module based on single filaments

作　　者：刘丽妍[1] 杨丹[1] 韩永良 LIU Li-yan;YANG Dan;HAN Yong-liang(School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China;Tianjin Han Qing Environmental Protection Technology Co.,Ltd.,Tianjin 300402,China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387 [2]天津汉晴环保科技有限公司,天津300402

出　　处：《天津工业大学学报》2021年第4期24-30,共7页Journal of Tiangong University

基　　金：天津市重点研发计划科技支撑重点项目(17YFZCSF01230)。

摘　　要：为研究中空纤维柱式膜组件的流场分布情况,建立了基于单根膜丝的三维多孔介质模型,并通过Fluent有限体积法求解控制方程,得出组件内混合模型下气液相的分布状况。结果表明:由于多孔介质膜丝表面的过滤阻力,膜组件内流体流速沿径向呈梯度不断减小,出口处由于组件壁面对其流向的影响,流速较大;气相速度为0.30 m/s与0.15 m/s时的速度分布无较大差异,且0.30 m/s时的膜丝表面气相速度较0.10 m/s时的大,气泡群产生的剪切应力强,有利于后期膜表面污染的清洗;0.30 m/s与0.10 m/s及0.20 m/s的液相速度相比,入口端部位膜丝受力大,流体流量大,经过膜过滤阻力后速度下降相对缓慢,膜通量相比较为理想。In order to study the flow field distribution of the hollow fiber column membrane module,a three-dimensional porous media model based on a single membrane filament was established,and the control equation was solved by the Fluent finite volume method,and the distribution of gas and liquid phases under the mixed model in the module was obtained.Studies have shown that due to the filtration resistance on the surface of the porous medium membrane filaments,the fluid flow rate in the membrane module was continuously reduced along the radial gradient,and the flow rate was relatively large at the outlet due to the influence of the flow direction of the module wall.There was no big difference between 0.30 m/s and 0.15 m/s gas phase velocity,and the membrane filament surface gas velocity at 0.30 m/s was larger than that at 0.10 m/s.The shear stress generated by the bubble group was strong,which was conducive to the cleaning of the membrane surface contamination in the later stage;Compared with the liquid phase velocity of 0.30 m/s,0.10 m/s and 0.20 m/s,the membrane filament at the entrance end were stressed and the fluid flow rate was large.The velocity drops relatively slowly after the membrane filtration resistance,and the membrane flux was relatively ideal.

关 键 词：膜组件 流体力学 流场分布 中空纤维 三维多孔介质模型 计算流体动力学(CFD) 

分 类 号：TQ028.8[化学工程] TQ051.893