Numerical study on micromixers with Wall-Fractal structure

Abstract

The ability for low reagent consumption and minimum waste production in a miniaturised system has generated great interest in the green chemistry field and medical testing. Microfluidic technology is the trend of miniaturization of testing instruments. Passive micromixer in particular has attracted much attention over active micromixers due to their fabrication and operation simplicity. This article presents a Wall-Fractal micromixer, in which, the effect of fractal structure on mixing efficiency was studied by numerical simulation. On the basis of fractal principle, the study focus on the Primary Wall-Fractal (PWF) and Secondary Wall-Fractal (SWF) in the single wall and double walls on the mixing efficiency. Under different numbers of Reynolds (Res), the efficiency of SWF was better than that of PWF. With the distance A-B increasing, it does not contribute to improve the mixing efficiency. Effected by the symmetrically Wall-Fractal that the mixing efficiency at Re = 0.05 and Re = 100 reach up to 95% in outlet. Because of its high mixing efficiency, Wall-Fractal micromixer will have broad application prospects.