College of Transportation, Ludong University, Yantai, Shandong, China.
Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, Liaoning, China.
Comput Methods Biomech Biomed Engin. 2021 Nov;24(15):1670-1678. doi: 10.1080/10255842.2021.1906867. Epub 2021 May 17.
In this paper, we designed fractal obstacles according to Murray's law and set them in a microchannel. We study the influence of the numbers of fractal obstacles, channel widths, branch widths, and the distance between fractal obstacles on mixing efficiency. The optimized micromixer has a high mixing efficiency of more than 90% at all velocities. This paper focuses on the analysis of the variation of mixing efficiency and pressure drop in the range of Reynolds number (Re) 0.1-150. The simulation results show that when the fluid velocity is low, the mixing efficiency of the fluids is mainly improved by molecular diffusion, when the fluid velocity is high, the microchannel with fractal obstacles can promote chaotic convection of the fluids and improve the mixing efficiency. The fractal structure based on Murray's law can be widely used in the design of passive micromixer.
在本文中，我们根据 Murray 定律设计了分形障碍物，并将其设置在微通道中。我们研究了分形障碍物的数量、通道宽度、分支宽度以及分形障碍物之间的距离对混合效率的影响。优化后的微混合器在所有速度下都具有超过 90%的高混合效率。本文重点分析了雷诺数 (Re) 在 0.1-150 范围内混合效率和压降的变化。模拟结果表明，当流体速度较低时，混合效率主要通过分子扩散来提高，当流体速度较高时，具有分形障碍物的微通道可以促进流体的混沌对流，从而提高混合效率。基于 Murray 定律的分形结构可以广泛应用于被动微混合器的设计中。
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