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Experimental and CFD Studies on the Performance of Microfiltration Enhanced by a Turbulence Promoter

ISSN号：1004-9541
期刊名称：Chinese Journal of Chemical Engineering
时间：2012.8
页码：617-624
分类：TQ028.8[化学工程] TS176.5[轻工技术与工程—纺织材料与纺织品设计;轻工技术与工程—纺织科学与工程]
作者机构：[1]State Key Laboratory of Fine Chemicals, R&D; Center of Membrane Science and Technology, School of ChemicalEngineering, Dalian University of Technology, Dalian 116012, China, [2]Department of Biological Engineering, University of Technology of Compiegne, Compiegne 60205, France
相关基金：Supported by the National Science Fund for Distinguished Young Scholars of China （21125628）, the National High Technol- ogy Research and Development Program of China （2012AA03A611） and the Fundamental Research Fund for the Central Universities （DUT 11ZD 112）.
相关项目：有机非多孔膜

作者： Ding Luhui|Dou Hong|Ju Jia|Li Baojun|

关键词：错流微滤, 过滤性能, 强湍流, CFD, 实验, 计算流体动力学, 壁面剪切应力, 水动力特性, membrane fouling, flux enhancement, turbulence promoter, computational fluid dynamics

中文摘要：

这份报纸报导试验性、计算的液体动力学(CFD ) 在一个螺旋状的螺丝钉提高的 microfiltration 的表演上学习插入。试验性的结果证明骚乱倡导者的使用能在钙碳酸盐暂停，和流动改进效率的 crossflow microfiltration 改进膜的 permeate 流动被操作条件强烈影响。精力消费分析显示提高的膜系统是节省在的更多的精力更高喂集中。为了由一个螺旋状的螺丝钉探索流动改进的内在的机制，插入，液体流动的三维的 CFD 模拟被实现。它表明在隧道内的液体流动的水动力学特征被骚乱倡导者完全改变。旋转流动模式在试管墙上增加搜索效果，减少膜表面上的粒子免职。停滞区域和高墙的缺席砍应力为提高的过滤表演负责。没有第二等的流动在隧道被产生，由于螺旋状的螺丝钉的 streamline 形状插入，以便提高的表演在相对低的精力被完成消费。

英文摘要：

This paper reports experimental and computational fluid dynamics （CFD） studies on the performance of microfiltration enhanced by a helical screw insert. The experimental results show that the use of turbulence pro- moter can improve the permeate flux of membrane in the crossflow microfiltration of calcium carbonate suspension, and flux improvement efficiency is strongly influenced by operation conditions. The energy consumption analysis indicates that the enhanced membrane system is more energy saving at higher feed concentrations. To explore the intrinsic mechanism of flux enhancement by a helical screw insert, three-dimensional CFD simulation of fluid flow was implemented. It reveals that hydrodynamic characteristics of fluid flow inside the channel are entirely changed by the turbulence promoter. The rotational flow pattern increases the scouring effect on the tube wall, reducing theparticle deposition on the membrane surface. The absence of stagnant regions and high wall shear stress are respon- sible for the enhanced filtration performance. No secondary flow is generated in the channel, owing to the streamline shape of helical screw insert, so that theenhanced perform, ance is achieved at relatively low energy consumption.