A novel three-dimensional electroosmotic micromixer based on the Koch fractal principle

Micromixers are extensively used in the field of biochemistry. In this study, based on the Koch fractal principle, a new type of micromixer is designed. To improve the mixing performance of the micromixer, under the action of fractal and electric field, irregular alternating eddy currents were generated in the microchannel to improve the mixing of fluids. Using COMSOL Multiphysics 5.4, by changing the fractal structure, direct current (DC) voltage size, electrode spacing, electrode configuration, and numerical calculations were determined, and a micromixer with excellent mixing effect was obtained. In particular, when the electroosmotic micromixer has three groups of alternately placed electrode pairs and Re = 0.01, the mixing efficiency can reach 99%.