Abstract: A novel static micro-mixer is described which is designed according to micro-fluidic characteristic. With the staggered oriented ridges in micro-channel, transverse comp-onents of flow are generated. This means can reduce mixing length, and enhance molecular diffusion processes. Computa-tional fluid dynamics method is applied to investigate flow field of this static micro-mixer, and gives the mixing principles of this micro-mixer. Rhodamine dye mixing experiments, as a flow visualization method, are carried out to show the develo-pment of mixing process and performance. Standard deviation of the intensity distribution in the images of the exit of the micro-mixer is used to quantify the degree of mixing as a function of the structural parameter and of the flow rate.

Key words: Flow visualization, Micro mixer, Micro-channel structural design