A novel Cantor micromixer with bending mouth structure

In order to improve the mixing efficiency of the passive mixer, we designed a bent Cantor fractal micro-mixer based on the principle of chaotic convection and folding wave. The influence of Cantor fractal obstacles height, inlet velocity and distance from bending mouth to Cantor fractal obstacles on the mixing efficiency were explore using COMSOL5.3 finite element analysis software. The results show that when the Cantor fractal obstacle height is 0.24mm, the mixing efficiency at 2mm from the bending mouth can reach 92%. However, at the outlet, mixing efficiency is lower than the mixing efficiency of the Cantor fractal obstacle height of 0.21 mm. The study found that although convective diffusion increases with the increase of Cantor fractal obstacles height and inlet velocity, the residence time of the mixed liquor in the mixer is also reduced, which is disadvantageous for the improvement of the mixing efficiency at the outlet. Through simulation comparison, it is found that when the distance from bending mouth to Cantor fractal obstacles is 0.675mm, the Cantor fractal obstacles height is 0.21mm and the inlet velocity is 0.6m/s, the mixing efficiency at the outlet can reach 99.8%.