非均匀zeta电势微通道内电渗涡流的形成机理  

Formation mechanism of electroosmotic-flow-vortex in a microchannel with non-uniform zeta potential

作　　者：王成法[1] 苑海超[1] 高跃峰[1] WANG Chengfa;YUAN Haichao;GAO Yuefeng(Marine Engineering College,Dalian Maritime University,Dalian,Liaoning 116026,China)

机构地区：[1]大连海事大学轮机工程学院

出　　处：《中国科技论文》2019年第12期1369-1373,共5页China Sciencepaper

基　　金：中央高校基本科研业务费专项资金资助项目(3132019192,3132019336);中国博士后科学基金资助项目(2019M661083)

摘　　要：为了探究外加直流电场下两段式直通道(上游通道和下游通道)中电渗涡流的形成机理,采用数值模拟方法研究了下游通道与上游通道的长度比、壁面zeta电势比等参数对电渗涡流形成的影响规律。结果表明:下游通道和上游通道长度比越大,下游通道与上游通道壁面zeta电势比越小,上游通道zeta电势绝对值从入口开始下降速度越快,越有利于在微通道内产生涡流。此外,在下游通道与上游通道壁面zeta电势比一定的前提下,外加电场强度和壁面zeta电势对微通道中产生的涡流大小没有影响。因此,下游通道与上游通道壁面的电渗流速度差对涡流的产生有重要影响。In order to explore the formation mechanism of electroosmotic-flow-vortex in a two-section straight(upstream and downstream) channel under an applied DC electric field, the influence of zeta potential ratio and length ratio of the downstream channel to upstream channel on the electroosmotic-flow-vortex formation was studied by numerical simulation method. The results show that the larger the length ratio of the downstream channel to the upstream channel, the smaller the zeta potential ratio of the downstream channel to the upstream channel, and the faster the absolute value of zeta potential of the upstream channel drops from the entrance, the more favorable it is for the generation of vortex in the microchannel. In addition, on the premise of a certain ratio of zeta potential on the wall of the downstream and the upstream channel, the applied electric field intensity and zeta potential on the wall have no effect on the vortex generated in the microchannel. Therefore, the velocity difference between the downstream and upstream channel has an important influence on the generation of vortex.

关 键 词：微通道 电渗涡流 非均匀zeta电势 直流电场 

分 类 号：O361.4[理学—流体力学]