摘要
综述了螺旋式膜组件的Dean二次流基本原理、管程常用传质关联式及其在膜分离过程中的应用状况,并从Dean二次流对膜过程通量和压力降以及传质性能的影响等诸方面.阐述了螺旋式组件的优势及限制因素.分析结果表明,流体在螺旋流道中由向心力产生Dean流效应,使管内湍动状态增强、边界层效应减弱,从而缓解浓差极化,使管程传质和膜通量与直管组件相比有明显改善.此外,该结构还有助于消除壳程流体的沟流、死区等常见负面因素.
This paper provided an analytical overview on performance and application of the Dean vortices flow from coiled module as well as a compendium of empirical correlations derived from various experiments. The Dean flow was origionated from centrifugal force which induced a secondary flow in the feed after using coiled feed channel. The resulting eddy flow abated the boundary layer resistance by promoting turbulent flow and thus facilitated the overall mass transfer. The overall mass transfer coefficient and membrane flux could be enhanced by a factor of 2~3.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2011年第1期118-124,共7页
Membrane Science and Technology
基金
国家自然科学基金(20476096
20776133)
浙江省重大科技计划资助项目(2008C13014-2)
关键词
螺旋式膜组件
Dean涡流
传质
通量
压力降
spiral membrane module
Dean vortices flow
mass transfer
flux
pressure drop
