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Numerical study on stagger Koch fractal baffles micromixer

机译：交错式科赫分形折流板微混合器的数值研究

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This work is mainly to study the mixing efficiency of the stagger Koch fractal baffles micromixers. They are regularly arranged at the top and bottom of the T-micromixer. The mixing efficiency of stagger secondary Koch fractal baffle (SKFB) micromixer and stagger primary Koch fractal baffle (PKFB) is compared at four kinds of Reynolds (Res). As the angle of the baffles changes, it contributes to enhance the chaotic convection of the micromixer. Especially at angle = 30 degrees, distance (D) = 0.1 mm, the vortex caused by the Koch fractal baffle structure is more obvious at Re = 100, the mixing efficiency of micromixer is more than 95% at Re = 0.05 and Re = 100. On the other hand, the deflection phenomenon caused by SKFB leads to an increasing in the contact area of two fluids which enhances the chaos convection. The concentration curve along the microchannel is studied in this paper, and the concentration curve varies from 0 to 1 mol/L It shows that the flow direction of the fluids in the microchannel changes very obviously which further proof the deflection phenomenon of fluids. The main research is that the Koch fractal curve changes the geometry of obstacles in the microchannel, which induces secondary or reverse flow, and improves chaotic convection and diffusion intensity. This is an essential element for micromixer mixing. (C) 2019 Elsevier Ltd. All rights reserved.
机译：这项工作主要是研究交错的科赫分形折流板微混合器的混合效率。它们定期排列在T型微混合器的顶部和底部。比较了四种雷诺（Res）交错二级Koch分形挡板（SKFB）微型混合器和交错一级Koch分形挡板（PKFB）的混合效率。随着挡板角度的变化，它有助于增强微混合器的混沌对流。特别是在角度= 30度，距离（D）= 0.1 mm时，由Koch分形挡板结构引起的涡旋在Re = 100时更为明显，在Re = 0.05和Re = 100时，微混合器的混合效率超过95％另一方面，由SKFB引起的偏转现象导致两种流体的接触面积增加，这增强了混沌对流。研究了沿微通道的浓度曲线，其浓度曲线从0到1 mol / L变化，表明微通道内流体的流向变化非常明显，进一步证明了流体的偏转现象。主要研究是科赫分形曲线改变了微通道中障碍物的几何形状，从而诱发了二次流或逆流，并改善了对流和扩散强度。这是微混合器混合的基本要素。 （C）2019 Elsevier Ltd.保留所有权利。

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