A design for modified planar passive micromixer based on the concept of vortex-generated structure enhanced mixing is described in this work.By using computational fluid dynamics CFD-ACE+

three-dimensional numerical simulation and structural optimization for mixing were performed in order to reveal the structural influence on the flow feature and mixing characteristics.Experimental data were used to validate the numerical analysis.The computational and experimental results for the concentration distributions and flow patterns demonstrate that the expansion vortices

separated vortices and Dean vortices appear in the curved channel of this modified micromixer

which is arranged to vortex-generated structures.The combination and enhancement of the vortex system increase the fluid disturbance

effectively improving the contact area of fluid and accelerating the mixing process.Based on comprehensive consideration of mixing efficiency and pressure drop distribution

the structural design adopts the vortex-generated structure with regular arrangement

and the gap width ratio Wd/W

thickness-width ratio B/W

and arrangement angle θa are equal to 1/4

3/10

and 120°

respectively.Significant mixing effect of fluid in the micromixer can be realized in a wide range of Reynolds number.