膜科学与技术

基于CFD的管式膜过滤过程的流体动力学研究

作者：杜玉红¹，酆启胤¹，刘恩华²，耿冬寒¹

单位：天津工业大学 1 机械工程学院天津市现代机电装备技术重点实验室； 2 材料科学与工程学院中空纤维膜材料与膜过程省部共建国家重点实验室；天津 300387

关键词：管式膜；流体动力学；CFD

出版年,卷(期):页码： 2016,36(1):72-80

摘要：

通过CFD数值计算的方法，采用达西定律和k-ω SST模型，对管式膜在80kpa恒定出口压力、不同流量下的过滤过程进行了流体动力学分析，揭示出了其内部的流动规律，经试验验证，模拟计算结果与实验值吻合较好。分析结果表明：流量越大对膜内壁面的冲刷能力更强、涡旋扰动更剧烈、渗透流量更大、跨膜压差也更大，膜管内随着轴向距离的增加压力呈线性减小的趋势，压力值线性减小的斜率k随着流量Q（L/H）的增加而减小、基本符合的关系。

Using the method of CFD numberical calculation,tubular membrane fluid dynamics analysis was carried out under 80kpa constant pressure different flow rates by darcy’s law and k-ω SST model, reveals its internal flow rule, after experimental verification, simulation results are in good agreement with the experimental value. The analysis shows that, when flow rate increases,the wash on membrane wall surface is stronger, vortex disturbance is more intense, seepage flow is greater, transmembrane pressure difference is bigger.In the membrane tube the pressure decreases linearly with the increase of the axial distance, the slope of the linear decrease k decreases with the increase of Q (L/H), conform to the relationship of k=-0.0125Q.

作者简介：杜玉红（1974—），女，副教授，黑龙江人，主要从事CFD数值模拟方面的研究。E-mail:duyuhong@tjpu.Edu.cn

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