Bottausci Frédéric, Cardonne Caroline, Meinhart Carl, Mezić Igor
Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
Lab Chip. 2007 Mar;7(3):396-8. doi: 10.1039/b616104a. Epub 2006 Dec 21.
We report for the first time a laminar high-performance continuous micromixing process of two fluids over a length of 200 microns in under 10 milliseconds achieved by an optimization of the control parameters amplitude and frequency in the mixing device denoted as 'Shear Superposition Micromixer'. We improve mixing time by approximately 5 orders of magnitude over diffusion-limited mixing. The data indicate that rapid mixing is a result of the combined action of Taylor-Aris dispersion in the main and secondary microchannels and unsteady vortex motion that occurs at finite Reynolds number, which occurs above a threshold amplitude and frequency. The mixing performance is quantified using micron-resolution particle image velocimetry (micro-PIV) and computational fluid dynamics (CFD) simulations.
我们首次报道了一种层流高性能连续微混合过程，该过程通过优化混合装置（称为“剪切叠加微混合器”）中的控制参数振幅和频率，在不到10毫秒的时间内使两种流体在200微米的长度上实现混合。与扩散限制混合相比，我们将混合时间缩短了约5个数量级。数据表明，快速混合是主微通道和次微通道中泰勒-阿里斯色散以及在有限雷诺数下发生的非定常涡旋运动共同作用的结果，这种运动发生在阈值振幅和频率之上。使用微米分辨率粒子图像测速技术（micro-PIV）和计算流体动力学（CFD）模拟对混合性能进行了量化。
