Structure Design and Performance Study of Modified Cross Channel Micromixer

Micromixer is a crucial component in microfluidic systems to achieve rapid mixing of fluids. It is finding applications in various fields such as biology, chemical engineering and medicine. The performance of micromixer directly impacts the functionality of microfluidic chips. This study introduced a modified cross channel passive micromixer. The impact of two structure paraments, cross angle and relative displacement, on mixing performance and fluid behavior was studied by numerical simulation. By optimizing these two parameters, the mixer can balance the increase in fluid contact area and the enhancement of lateral secondary flow. The results indicated that the modified cross channel micromixer exhibits the highest mixing index of 0.94 under the condition of Re = 0.1. Compared to traditional split and recombination multilayer micromixers, modified cross channel micromixer demonstrates lower pressure loss across the range of Re from 0.1 to 100. The micro-mixer chip was fabricated using DLP 3D printing technology, and a tea polyphenol detection experiment was conducted, proving that the micromixer can significantly reduce the time cost of the experimental process.