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首页> 外文期刊>Journal of Micromechanics and Microengineering >Geometric effects on mixing performance in a novel passive micromixer with trapezoidal-zigzag channels
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Geometric effects on mixing performance in a novel passive micromixer with trapezoidal-zigzag channels

机译：带有梯形之字形通道的新型无源微型混合器中几何形状对混合性能的影响

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摘要

A novel passive micromixer, called a trapezoidal-zigzag micromixer (TZM), is reported. A TZM is composed of trapezoidal channels in a zigzag and split-recombine arrangement that enables multiple mixing mechanisms, including splitting-recombining, twisting, transversal flows, vortices, and chaotic advection. The effects of geometric parameters of the TZM on mixing performance are systematically investigated by the Taguchi method and numerical simulations in COMSOL Multiphysics. The number of mixing units, the slope angle of the trapezoidal channel, the height of the constriction element, and the width ratio between the middle-trapezoidal channel and the side-trapezoidal channel are the four parameters under study. The mixing performance of the TZM is investigated at three different Reynolds number (Re) values of 0.5, 5, and 50. The results showed that a TZM with six mixing units, a trapezoidal slope angle of 75 degrees, a constricting height of 100 mu m, and a width ratio of 0.5 has the highest mixing efficiency. This optimal TZM has a mixing efficiency greater than 85% for Re values from 0.1 to 80. In particular, for Re <= 0.9 and Re >= 20, the mixing efficiency of the optimal TZM is greater than 90%. The proposed TZM has a higher mixing efficiency and a smaller footprint than previously reported micromixers.
机译：据报道，一种新型的无源微混合器，称为梯形之字形微混合器（TZM）。 TZM由锯齿形的梯形通道和拆分重组结构组成，可实现多种混合机制，包括拆分重组，扭曲，横向流动，涡旋和混沌对流。通过Taguchi方法和COMSOL Multiphysics中的数值模拟，系统地研究了TZM的几何参数对混合性能的影响。混合单元的数量，梯形通道的倾斜角，收缩元件的高度以及中梯形通道和侧梯形通道之间的宽度比是研究的四个参数。在三种不同的雷诺数（Re）值分别为0.5、5和50的情况下研究了TZM的混合性能。结果表明，具有六个混合单元的TZM，梯形倾斜角为75度，收缩高度为100亩。 m，且宽度比为0.5时，混合效率最高。对于从0.1到80的Re值，此最佳TZM的混合效率大于85％。特别是，对于Re <= 0.9和Re> = 20，最佳TZM的混合效率大于90％。与以前报道的微型混合器相比，拟议的TZM具有更高的混合效率和更小的占地面积。

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