Electroosmotic micromixing is generally a highly desirable technique in microanalysis
systems due to its ability to mix fluids at the microliter level. Herein, a contraction-expansion
microchannel is used to conduct a numerical study on the mixing caused by AC
electroosmotic. We investigate the flow and concentration field distributions in the
microchannel and observe two circulation flows and four rotating vortices generated in the
expansion chamber by the influence of AC electric fields. The generation of the rotating …