浸没式中空纤维膜过滤点通量分布数学模拟  

Mathematical modeling for the local flux distribution of submerged hollow fiber membrane module

作　　者：李建新[1] 李贤辉[1] 王虹[1] 何本桥[1] 王捷[1] 张宏伟[1] 李继香[2] 

机构地区：[1]天津工业大学省部共建分离膜与膜过程国家重点实验室,天津300387 [2]中国科学院上海高等研究院,上海201203

出　　处：《膜科学与技术》2015年第5期1-5,共5页Membrane Science and Technology

基　　金：国家自然科学基金(51408588);教育部长江学者创新团队发展计划(IRT13084)

摘　　要：本文根据质量和动量守恒原理,考虑纤维膜径向跨膜流动对流动阻力影响,构建出基于完全质量和动力守恒的中空纤维膜过滤点通量分布流体力学数学模型,并应用该模型研究了操作通量和纤维膜外形结构(内外径、长度、固有阻力)对局部过滤行为影响规律.结果发现,中空纤维膜在一定操作条件下存在一个有效工作长度或区域.并且,点通量分布不均匀程度随着纤维膜长度、操作通量和膜固有阻力的增加而增加,但随纤维膜内径减小而增加.A filtration mathematical model was successfully developed by complete mass balance and momentum balance to predict the local flux distribution along fiber.The effect of radial permeate flow on flow resistance was taken into consideration in the model.The effects of fiber length,inside diameter,average operating flux and membrane intrinsic resistance on local flux distribution were investigated using this model.The simulated results showed that there existed an effective working length of the submerged hollow fiber membrane at certain operating conditions.Furthermore,it was also found that the asymmetry of local flux distribution increased with the increase of average operating flux,fiber length and membrane intrinsic resistance,whereas it decreased with an increase in fiber inner diameter.This modeling plays a theoretical foundation for the optimizing and operating of hollow fiber membrane module.

关 键 词：过滤数学模型 浸没式中空纤维膜 点通量分布 动量守恒 质量守恒 

分 类 号：TQ028.8[化学工程]