Design and Simulation of Passive Microfluidic Mixers
|School||Shanghai Jiaotong University|
|Keywords||passive mixers based on capillary multi-layer twining mixer double-layer lamination mixer and double-layer zigzag mixer|
At micro scale, because of the low Reynolds number, the flow is almost always laminar and without turbulence, mixing becomes difficult. While in microfluidic systems, many chemical and biological reactions depend on efficient mixing, so it is necessary to develop efficient micromixer. Without external energy to stir the flow, passive mixer is easier to be fabricated and integrated, thus attract many researchers’attention. This thesis introduces four kinds of passive micormixers—passive mixers based on capillary, multi-layer twining mixer, double-layer lamination mixer and double-layer zigzag mixer. There are three models built in the category of passive mixers based on capillary and only one model for the other three kinds of mixers. The mixing through the channels and the relationship of mixing efficiency and Reynolds number has been discussed. The results of simulation shows that compare with T-mixer, the four kinds of mixers can promote the mixing effectively when 0.15<Re<3, the mixing length is much smaller than that of T-mixer, and the mixing efficiency of the multi-layer twining mixer, double-layer lamination mixer, double-layer zigzag mixer and one design in the category of passive mixer based on capillary changes little when Reynolds number changes. These designs of mixers can be used in the microfluidic systems.