Performance and implementation of centrifugal serpentine micromixers with non-rectangular cross-section
Performance and implementation of centrifugal serpentine micromixers with non-rectangular cross-section
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DOI：
10.1088/1361-6439/ab146c
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发表时间：
2019-07-01
影响因子：
2.3
通讯作者：
Fodor, Petru S.
中科院分区：
文献类型：
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作者：
Clark, Joshua A.;Butt, Tahir A.;Fodor, Petru S.
由重复 S 形单元组成的平面蛇形微通道的流体流动和混合特性通过计算和实验来表征，雷诺数 Re < 100。特别是，我们发现，相对于标准矩形轮廓蛇形通道，使用具有变化方向的几何单元的非矩形横截面大大增强了其混合性能。横截面的优化能够以低至 20 的雷诺数有效混合两种流体组分，使这些设计适用于化学反应工程和生物分析平台。对此类通道中存在的横截面流动结构的计算分析表明，其性能的增强与次级横向涡流的形成相关。在最佳设计中，它们的存在通过拉伸待混合的流体组分之间的界面以及促进混沌平流来增加微通道中的传质。
The fluid flow and mixing characteristics of planar serpentine microchannels consisting of repeating S-shaped units was characterized both computationally and experimentally for Reynolds numbers Re < 100. In particular, it was found that using non-rectangular cross-sections with changing orientation for the geometrical units greatly enhances their mixing performance relative to standard rectangular profile serpentine channels. The optimization of the cross-section enables efficient mixing of two-fluid components at Reynolds numbers as low as 20, making these designs practical for chemical reaction engineering and biological assays platforms. A computational analysis of the cross-sectional flow structures present in this type of channels indicates that their enhanced performance is correlated with the formation of secondary transversal vortexes. In the optimal designs, their presence increases the mass transfer in the microchannel by both stretching the interface between the fluid components to be mixed, as well as by promoting chaotic advection.