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Passive split and recombination micromixer with convergent-divergent walls

机译：具有会聚-发散壁的无源分流和重组微混合器

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摘要

A passive micromixer featuring convergent-divergent channel walls with sinusoidal variations is proposed in this work. The main channel splits into two sub-channels that recombine at regular intervals along the microchannel's length. To evaluate mixing performance, steady Navier-Stokes equations with a diffusion-convection model for species concentration are solved for Reynolds numbers in the range of 10 ≤ Re ≤ 70. A mixing index based on the variance of the mass fraction of the mixture is employed to evaluate the mixing performance of the micromixer. The effects of the Reynolds number, the amplitude of the sinusoidal walls, and the aspect ratio of the channel on mixing performance are investigated. The results indicate that a symmetric double vortex pair appeared at the throat of the convergent-divergent channel. And, secondary motions as a result of differential centrifugal forces originating in the sub-channels and throat of the convergent-divergent walls significantly affect mixing behavior. The proposed micromixer shows significantly improved mixing performance compared to a similar geometry based on the concept of unbalanced split and collisions for a wide range of Reynolds numbers. Also, the pressure drop is acceptable for a variety of lab-on-a-chip and micro-total analysis systems.
机译：在这项工作中，提出了一种无源微混合器，其特点是具有正弦变化的会聚-发散通道壁。主通道分为两个子通道，两个子通道沿着微通道的长度以规则的间隔重新组合。为了评估混合性能，对于扩散浓度为10≤Re≤70的雷诺数，使用带有扩散对流模型的稳定Navier-Stokes方程进行求解。采用基于混合物质量分数方差的混合指数评估微混合器的混合性能。研究了雷诺数，正弦波壁的振幅以及通道的纵横比对混合性能的影响。结果表明，对称的双涡旋对出现在收敛-发散通道的喉部。并且，由于来自会聚-发散壁的子通道和喉部的离心力的不同而引起的二次运动显着影响了混合行为。与基于大范围雷诺数不平衡分裂和碰撞概念的类似几何体相比，拟议的微型混合器显示出显着改善的混合性能。同样，压降对于各种片上实验室和微观总体分析系统是可以接受的。

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