Improvement of mixing efficiency in twisted micromixers: The impact of cross-sectional shape and eccentricity ratio

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-09-25 DOI:10.1016/j.cep.2024.110006

Haniyeh Yousefi , Shima Akar , Hamid Niazmand , Seyed Ali Mousavi Shaegh

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Abstract

Microfluidic mixers with twisted geometries show promise for high mixing efficiency, especially at elevated flow rates. However, there is a lack of understanding regarding the optimal geometrical parameters to enhance mixing across various Reynolds numbers. This study aimed to explore the influence of pitch number, cross-section geometry, and eccentricity ratio on the performance of the twisted micromixer. The flow field in these micromixers was solved numerically and the mixing index and pressure drop were calculated for Reynolds numbers of 1 to 400. Twisted micromixers with rectangular cross-sections and aspect ratios of 0.5 and 2 outperformed those with square cross-sections by up to 34% in mixing efficiency, exceeding 90% efficiency for Reynolds numbers from 1 to 400. Moreover, the eccentricity ratio (ER) was studied for the first time in twisted micromixers in this study and demonstrated a critical role in improving the mixing performance. For low to intermediate Reynolds numbers, the highest ER of 0.75 showed the best performance, while for high Reynolds numbers, an ER of 0.5 was optimal. These insights offer valuable direction for designing high-performance micromixers for advanced microfluidic systems.

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提高扭曲微搅拌器的搅拌效率：横截面形状和偏心率的影响

具有扭曲几何形状的微流体混合器有望实现较高的混合效率，尤其是在流速较高的情况下。然而，人们对在不同雷诺数条件下增强混合效果的最佳几何参数还缺乏了解。本研究旨在探索螺距数、横截面几何形状和偏心率对扭曲微混器性能的影响。对这些微搅拌器中的流场进行了数值求解，并计算了雷诺数为 1 到 400 时的混合指数和压降。横截面为矩形、纵横比为 0.5 和 2 的扭曲微搅拌器的混合效率比横截面为正方形的微搅拌器高出 34%，在雷诺数为 1 到 400 的情况下，混合效率超过 90%。此外，本研究首次对扭曲微搅拌器的偏心比（ER）进行了研究，结果表明偏心比在提高搅拌性能方面起着至关重要的作用。对于中低雷诺数，0.75 的最高 ER 显示出最佳性能，而对于高雷诺数，0.5 的 ER 则是最佳选择。这些见解为设计用于先进微流控系统的高性能微搅拌器提供了宝贵的方向。

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来源期刊

Chemical Engineering and Processing - Process Intensification 工程技术-工程：化工

CiteScore

7.80

自引率

9.30%

发文量

408

审稿时长

49 days

期刊介绍： Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.