Simulation analysis and optimization design of mixing performance of staggered impact micromixer

As an important part of microfluidic equipment, the micro mixer is widely used in the biochemical field. Because the fluid flow in the micro channel is laminar and the mixing is poor, the mixing becomes the main factor affecting the efficiency for rapid reaction. In this paper, three kinds of micro mixer structures that affect the mixing efficiency were numerically simulated. By changing the three structural parameters of the micro mixer, namely, the channel width to height ratio, the maximum width at the divergence, and the dislocation height at the collision, the mixing performance under laminar flow was simulated. The results showed that the height of dislocation at the fluid collision had the most obvious influence on the mixing performance. The structure of the micro mixer (MST) with the best simulation results was further optimized to obtain a new micro mixer (MTT). The MTT was compared with MST and ordinary T-type micro mixer (MT). The mixing index at the outlet of MTT micro mixer reached 81%, while that of ordinary T-type micro mixer was only 5.3% under the same conditions. Through simulation and analysis of the mixing process, the structure of the dislocation collision type micro mixer was effectively improved, which was conducive to improving the fluid mixing efficiency and the reaction speed. © 2023 Chemical Industry Press. All rights reserved.