Investigation of Mixing Performance of Two-Dimensional Micromixer Using Tesla Structures with Different Shapes of Obstacles
Investigation of Mixing Performance of Two-Dimensional Micromixer Using Tesla Structures with Different Shapes of Obstacles
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DOI：
10.1021/acs.iecr.9b06741
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发表时间：
2020-03-04
影响因子：
4.2
通讯作者：
Kim, Sun Min
中科院分区：
文献类型：
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作者：
Hossain, Shakhawat;Fuwad, Ahmed;Kim, Sun Min
在这项工作中，进行了数值和实验分析，以分析不同形状的障碍物（菱形、矩形和圆形）对特斯拉结构微混合器的混合性能的影响。通过使用对流扩散模型在雷诺数范围 0.2-200 内求解纳维-斯托克斯方程，对流体流动行为进行数值分析。特斯拉结构可以通过流体流的分裂和重组产生横向色散。使用软光刻技术和聚二甲基硅氧烷（PDMS）制造微混合器。使用倒置显微镜和图像处理技术进行定量和定性分析。零星分布的障碍物显着增强了混沌平流，因此横向扩散和混沌平流的协同效应可以改善整体混合。具有圆形障碍物的特斯拉结构被发现在混合和节能方面非常有效。实验结果的定量估计表明在整个工作范围内与数值结果高度一致。
In this work, numerical and experimental analyses have been conducted to analyze the effect of different shapes of obstructions (diamond, rectangular, and circular) on mixing performance of a micromixer with Tesla structures. Fluid flow behaviors were numerically analyzed by solving the Navier-Stokes equations using convection-diffusion model in the Reynolds number range of 0.2-200. Tesla structure can produce transverse dispersion by splitting and recombining of the fluid streams. Micromixers were fabricated using a soft lithography technique with polydimethylsiloxane (PDMS). Quantitative and qualitative analyses were performed using inverted microscopy and image processing techniques. Sporadically positioned obstacles enhance the chaotic advection significantly, and thus the synergistic effect of the transverse dispersion and chaotic advection can improve overall mixing. Tesla structure with circular obstacles found to be very effective in terms of mixing and energy savings. Quantitative estimation of the experimental results shows highly consistent with the numerical results throughout the working range.