3D micromixers based on Koch fractal principle
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In this paper, we mainly study the effect of the Koch fractal microchannel on the mixing efficiency. Using the Koch fractal principle can effectively change the geometric shape of the microchannel, and increase the convective contact area of the microfluid, enhance chaotic convection. Changing the geometric shape of the microchannel is an effective way to improve the mixing efficiency of the micromixer. So, it is of great significance to study the influence of fractal principle on the mixing performance of microchannel. This paper introduces the design process of the fractal microchannel. The effects of different microchannel heights and different Reynolds (Res) on the mixing efficiency are studied, we also compared the mixing efficiency of the Primary fractal and secondary fractal with different Res. When the microchannel height is 0.5 mm, the mixing efficiency exceeds 90%. In the main section of the Koch fractal channel, the vortex region produced by the fractal microchannel is an important factor to improve the mixing efficiency of the micromixer. As its excellent mixing performance, the micromixers based on the fractal principle will have great potential in chemical engineering and bioengineering.
This work was supported by National Natural Science Foundation of China (51405214), The Key Project of Department of Education of Liaoning Province (JZL201715401).
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