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The effect of varying radius of curvature on mixing in elliptical spiral microchannels
Chemical Engineering and Processing: Process Intensification ( IF 4.3 ) Pub Date : 2021-04-07 , DOI: 10.1016/j.cep.2021.108401
Rana Altay , Abuzer Alp Yetisgin , Kaan Erdem , Ali Koşar

Effective mixing is essential for a wide range of microfluidics applications. Passive micromixers have attracted much attention during recent years due to their low-cost and simple fabrication procedures with less power input in their implementation to high-throughput microfluidics platforms. Increasing the efficiency of micromixers is possible with an optimum geometry of inertial microfluidic channels, which utilize Dean vortices and Dean flows for the enhancement of mixing. Recently, micromixers with curved microchannels have been introduced to the literature. Yet, the enormous potential of elliptical spiral microchannels has not been adequately revealed. This study aims to assess the mixing performance of five-loop spiral polydimethylsiloxane micromixers with spiral structures and elliptic structures, which have different initial aspect ratios with varying radii of curvature along the channel. The performances of these micromixers were evaluated by comparing the mixing indices and intensity profiles obtained from inverted fluorescence microscopy images over a broad range of Reynolds numbers between 10 and 100. Elliptical spiral microchannels were able to provide mixing indices up to 98% at a Reynolds number of 20. Overall, the utilization of ellipse-shaped microchannels appear to provide a passive control over the mixing performance at several locations through the microchannel.



中文翻译:

曲率半径变化对椭圆螺旋微通道混合的影响

有效的混合对于广泛的微流控应用是必不可少的。近年来,无源微混合器由于其低成本,简单的制造过程以及在高通量微流体平台上的实现而消耗的功率更少,因此备受关注。利用惯性微流体通道的最佳几何形状可以提高微混合器的效率,该惯性微流体通道利用Dean涡流和Dean流动来增强混合。近来,具有弯曲的微通道的微混合器已经被引入文献中。然而,椭圆形螺旋微通道的巨大潜力尚未得到充分揭示。这项研究旨在评估具有螺旋结构和椭圆结构的五环螺旋聚二甲基硅氧烷微混合器的混合性能,它们具有不同的初始长宽比,沿通道的曲率半径不同。通过比较从倒置荧光显微镜图像获得的雷诺数在10到100的宽范围内的混合指数和强度曲线,可以评估这些微型混合器的性能。椭圆螺旋微通道能够在雷诺数下提供高达98%的混合指数总的来说,椭圆形微通道的使用似乎提供了对通过微通道的几个位置处的混合性能的被动控制。

更新日期:2021-04-16
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