T-shaped micromixer with periodic baffles

HE Xiu-hua; YAN Jie; WANG Yan

doi:10.3788/OPE.20152310.2877

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T-shaped micromixer with periodic baffles

Micro Nano Technology and Fine Mechanics | 更新时间：2020-08-13

- T-shaped micromixer with periodic baffles
- Optics and Precision Engineering Vol. 23, Issue 10, Pages: 2877-2886(2015)
- 作者机构：
  
  江苏大学能源与动力工程学院,江苏镇江,212013
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152310.2877
  CLC： TP271.3;TH703
- Received：17 April 2015，
  
  Revised：05 June 2015，
  
  Published：25 October 2015
- 稿件说明：
移动端阅览
何秀华, 颜杰, 王岩. 内置周期挡板的T-型微混合器[J]. 光学精密工程, 2015,23(10): 2877-2886

HE Xiu-hua, YAN Jie, WANG Yan. T-shaped micromixer with periodic baffles[J]. Editorial Office of Optics and Precision Engineering, 2015,23(10): 2877-2886
何秀华, 颜杰, 王岩. 内置周期挡板的T-型微混合器[J]. 光学精密工程, 2015,23(10): 2877-2886 DOI： 10.3788/OPE.20152310.2877.

HE Xiu-hua, YAN Jie, WANG Yan. T-shaped micromixer with periodic baffles[J]. Editorial Office of Optics and Precision Engineering, 2015,23(10): 2877-2886 DOI： 10.3788/OPE.20152310.2877.

摘要

设计了一种流道内布置周期挡板结构的高效T-型微混合器来提高微流控系统的混合效率。该微混合器结构简单

周期布置的挡板可以有效地缩短流体混合所需的流道长度和时间

混合效率高。安排了正交实验组

利用计算流体力学软件ANSYS CFX研究了流道结构参数对混合效果的影响。采用静态田口分析法对数值模拟结果进行分析。结果表明:流道结构参数对混合效果的相对影响程度排列如下:挡板攻角(

)

流道高度(

)

挡板宽度(

)

相邻混合单元之间距离(

)。根据结构参数对混合效果的影响程度

得出研究参数范围内的最优组合为:

=75°

=0.4

=0.7

=0.6

(这里

为流道宽度

等于200 μm)。实验显示

结构参数符合最优参数组合的微混合器的混合效果提升显著

雷诺数

=54时即可实现完全混合(混合指标

95%)。文中研究了流道结构对进出口压降的影响

结果显示

攻角θ对进出口压降的影响趋势在不同雷诺数下相同

参数

亦如此。

Abstract

An effective passive micromixer based on the T-shaped channel with periodic baffles mounted on the bottom of main channel was designed to enhance the mixing performance of the microfluidic system. Instead of complex spacial geometries

simple periodic geometric features were used to decrease the required mixing distances and time and to obtain remarkable mixing efficiency. With an orthogonal array

the effects of geometrical parameters on the mixing performance were studied by numerical simulations using commercial computational fluid dynamics code ANSYS CFX. A static Taguchi analysis was taken to evaluate the relative effectiveness of the geometrical parameters. The analysis results indicate that the relative effectiveness can be ranked as: the angle of attack(

)

microchannel height

)

baffle width(

)

baffle spacing(

). Based on the relative effectiveness of the geometrical parameters

an optimal parameter group selected are

=75°

=0.4

=0.7

=0.6

(here

is the channel width with a value of 200 μm). It demonstrates that the mixing performance of the micromixer with optimal parameter group is improved obviously

and a complete mixing(mixing index

is better than 95%) can be obtained when the Reynolds number

is 54. The characteristics of the pressure drop depending on the geometrical parameters are also investigated

and the result shows that the selected θ affects the pressure drop in a similar way under different Reynolds numbers

so does the selected

and

关键词

Keywords

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