Numerical Study on Bilateral Koch Fractal Baffles Micromixer

摘要

This work is mainly to study the influences that mixing efficiency of bilateral Koch fractal baffles micromixer. This study is based on the Koch fractal principle, with the baffles neatly distributed at the bottom and top of the T-micromixer. After comparing the mixing efficiency of the secondary Koch fractal baffle micromixers and the primary Koch fractal baffle micromixers at four kinds of Reynolds (Res), it can be determined that themixing efficiency of secondary Koch fractal baffle (SKFB) micromixer is better than primary Koch fractal baffle (PKFB). We changed the angle of the baffle to get better mixing efficiency. Because it helps to enhance the chaotic convection of the micromixer as the angle of the baffle changes. Especially at angle = 30 degrees, the vortex is more obvious when the Koch fractal baffle structure at Re = 100 and the mixing efficiency of micromixer is more than 95%. This is mainly due to the deflection caused by SKFB, which leads to an increase in the contact area of the two fluids, there by enhancing chaotic convection. In this paper, the concentration curve in the microchannel is studied and the varies of concentration curve from 0 to 1 mol/L. The results show that changing the angle of the baffle greatly improves the mixing efficiency of the fluid in the microchannel.