Passive Micro Mixers for Applications in the Micro Reactor and µTAS Field
Passive Micro Mixers for Applications in the Micro Reactor and µTAS Field
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适用于微反应器和 µTAS 领域应用的被动式微混合器
DOI：
10.1115/icmm2004-2319
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
F. Schönfeld
中科院分区：
文献类型：
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作者：
S. Hardt;K. Drese;V. Hessel;F. Schönfeld
综述了微混合技术的发展现状，重点介绍了被动式微混合器中的液体混合。所介绍的混合器根据所采用的流体动力学原理进行区分，并详细讨论了四个重要原理：流体动力学聚焦、流动分离、混乱平流和分裂-重组流动。结果表明，这些原则提供了一个良好的混合性能在各种动态制度。流体动力学聚焦是一个与流动的雷诺数非常无关的概念。流动分离在几百雷诺数范围内提供了丰富的动力学行为，与低雷诺数下已经发现的纯扩散混合相比，具有上级性能。对于混沌平流，存在针对低雷诺数和相对高雷诺数定制的不同实施方式，这两者都导致两种流体之间的界面呈指数增加。分裂-重组流动只能在低雷诺数区域以接近理想的形式实现。相应的混合器可以配备有相对较宽的通道，从而实现有利的吞吐量与压降的比率。本文中给出的概述应使微混合技术的潜在用户能够为所设想的应用选择最有利的概念，特别是在化学过程技术领域。
An overview is given of current developments in micro mixing technology, where the emphasis is on liquid mixing in passive micro mixers. The mixers presented are differentiated by the hydrodynamic principle employed, and four important principles are discussed in some detail: hydrodynamic focusing, flow separation, chaotic advection and split-and-recombine flows. It is shown that these principles offer an excellent mixing performance in various dynamical regimes. Hydrodynamic focusing is a concept working very much independently of the Reynolds number of the flow. Flow separation offers a rich dynamical behavior over a Reynolds number scale of several hundred, with superior performance compared to purely diffusive mixing already found at low Reynolds numbers. For chaotic advection different implementations tailor-made for low and comparatively high Reynolds numbers exist, both leading to an exponential increase of the interface between two fluids. Split-and-recombine flows can only be realized in a close-to-ideal form in the low Reynolds number regime. Corresponding mixers can be equipped with comparatively wide channels, enabling a favorable ratio of throughput to pressure drop. The overview given in this article should enable a potential user of micro mixing technology to select the most favorable concept for the application envisaged, especially in the field of chemical process technology.Copyright © 2004 by ASME