微小三角形槽道内电渗流动特性分析  

Electrokinetic flow behavior in micro triangle channels

作　　者：廖强[1] 温廷英[1] 朱恂[1] 

机构地区：[1]重庆大学工程热物理研究所,重庆400030

出　　处：《化工学报》2007年第11期2852-2858,共7页CIESC Journal

基　　金：国家自然科学基金项目(90410005);教育部优秀青年教师资助计划项目(教人司[2003]355号文);重庆市应用基础研究项目(2003-7966)~~

摘　　要：提出了微小三角形槽道内电渗流动理论计算方法,通过Galerkin法计算并分析了其内部的电势及速度分布,获得了温度、槽道尺寸、外加电势的电场强度、ζ电势以及电解质浓度对微小三角形槽道内电渗流动的影响规律。计算结果表明:微小三角形槽道内液体的质量流量随ζ电势、电场强度、流体温度及电解质浓度的增加而增加,随微小三角形槽道尺寸的增加先增加后减小。A theoretical calculation method of electrokinetic flow in micro equilateral triangle channels method. The Poisson-Boltzmann equation and the momentum equation were solved to determine the electric potential field and electrokinetic flow field in micro equilateral triangle channels respectively. The effects of electric field strength, zeta potential, electrolyte concentration, fluid temperature, and micro triangle channel size on the electrokinetic flow behavior were discussed by virtue of the calculated electric potential profile and flow field profile. The mass flux of liquid in micro equilateral triangle channels increased with increasing zeta potential and electric field strength. A larger concentration of electrolyte and higher fluid temperature could lead to a larger mass flux of fluid. The mass flux of fluid firstly increased to a maximum value and then decreased as the size of micro equilateral triangle channel further increased, which implied that there existed a specific channel size corresponding to the maximum fluid mass flux of electrokinetic flow in the micro equilateral triangle channel under the same operation conditions.

关 键 词：微小三角形槽道 电渗流动 GALERKIN法 ζ电势 质量流量 

分 类 号：TQ028.74[化学工程]