Analysis of electroosmotic flow with step change in zeta potential
Analysis of electroosmotic flow with step change in zeta potential
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DOI：
10.1016/s0021-9797(02)00078-4
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发表时间：
2003-02-15
影响因子：
9.9
通讯作者：
Yang, RJ
中科院分区：
文献类型：
--
作者：
Fu, LM;Lin, JY;Yang, RJ
术语电渗流是指通过向ζ电位施加电场而诱导的水溶液的整体流动。微通道中的电介质的特性取决于zeta电位的性质，即，无论是均匀的还是不均匀的。在这项研究中，完整的Navier-Stokes方程和Nernst-Planck方程用于模拟zeta电位阶跃变化时发生的电特性变化。发现双电层的厚度从zeta电位增加的位置向下游逐渐增加。结果表明，zeta电位的阶跃变化导致速度分布和压力分布的显着变化。(C)2003 Elsevier Science（美国）。All rights reserved.
The term electroosmotic flow refers to the bulk flow of an aqueous solution induced by the application of the electric field to the zeta potential. The characteristics of EOF in a microchannel depend upon the nature of the zeta potential, i.e., whether it is uniform or nonuniform. In this study, the full Navier-Stokes equation and the Nernst-Planck equation are used to model the change in EOF characteristics that occur when a step change in zeta potential is applied. It is found that the thickness of the electrical double layer gradually increases downstream from the location at which the zeta potential is increased. The results indicate that a step change in zeta potential causes a significant variation in the velocity profile and in the pressure distribution. (C) 2003 Elsevier Science (USA). All rights reserved.