Effect of geometry on fluid mixing of the rhombic micromixers
Effect of geometry on fluid mixing of the rhombic micromixers
复制标题
DOI：
10.1007/s10404-007-0197-9
复制
发表时间：
2008-05-01
影响因子：
2.8
通讯作者：
Shih, T. R.
中科院分区：
文献类型：
--
作者：
Chung, C. K.;Shih, T. R.
提出了一种具有菱形微通道和缩放元件的平面微混合器。采用CFD-ACE数值模拟和实验相结合的方法设计并研究了三个参数（菱形数、转向角和有无缩放元件）对混合的影响。混合效率取决于雷诺数和几何参数。数值模拟结果表明，较小的转向角（α）、较高的雷诺数以及菱形数的增加，均能产生较大的回流，从而有利于流体的混合。大的回流量有利于增加两组分间的界面接触面积和对流混合。在数值模拟中，混合效率达到99%，最有效的系统组成的三菱形混合器与收敛-发散元件在α = 30和Re = 200。在相同的设计参数下，获得了约94%的实验混合效率。正如预期的那样，它低于理论效率，但仍然非常有效。具有这种设计的微混合器在快速和高通量混合的未来应用中可能是有用的。
A planar micromixer with rhombic microchannels and a converging-diverging element has been proposed for its effective mixing. Both CFD-ACE numerical simulations and experiments were used to design and investigate the effect of three parameters (number of rhombi, turning angle and absence or presence of the converging-diverging element) on mixing. Mixing efficiency is dependent upon Reynolds number and geometrical parameters. Through the results of numerical simulation, it is evident that smaller turning angle (alpha), higher Reynolds number and increasing number of rhombi will result in better fluid mixing due to the occurrence of larger recirculation. The large recirculation is beneficial for both the increased interfacial contact area between two species and the convective mixing. In the numerical simulations, mixing efficiency of 99% was achieved with a most efficient system consisting of three-rhombus mixer with a converging-diverging element at alpha = 30 and Re = 200. An experimental mixing efficiency of about 94% has been obtained with the same design parameters. As expected, it is lower than the theoretical efficiency but is still very effective. A micromixer with such design can be potentially useful in the future applications of rapid and high throughput mixing.