Performance optimization of chaotic flow micromixer

He ZHANG; Shuang YANG; Rongyan CHUAI; Xin LI

doi:10.37188/OPE.20223003.0286

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Performance optimization of chaotic flow micromixer

Micro/Nano Technology and Fine Mechanics | 更新时间：2022-02-17

- Performance optimization of chaotic flow micromixer
- Optics and Precision Engineering Vol. 30, Issue 3, Pages: 286-295(2022)
- 作者机构：
  
  沈阳工业大学信息科学与工程学院，辽宁沈阳 110870
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20223003.0286
  CLC： O652;TQ021
- Received：16 August 2021，
  
  Revised：16 September 2021，
  
  Published：15 February 2022
- 稿件说明：
移动端阅览
张贺,杨爽,揣荣岩等.混沌流微混合器的性能优化[J].光学精密工程,2022,30(03):286-295.

ZHANG He,YANG Shuang,CHUAI Rongyan,et al.Performance optimization of chaotic flow micromixer[J].Optics and Precision Engineering,2022,30(03):286-295.
张贺,杨爽,揣荣岩等.混沌流微混合器的性能优化[J].光学精密工程,2022,30(03):286-295. DOI： 10.37188/OPE.20223003.0286.

ZHANG He,YANG Shuang,CHUAI Rongyan,et al.Performance optimization of chaotic flow micromixer[J].Optics and Precision Engineering,2022,30(03):286-295. DOI： 10.37188/OPE.20223003.0286.

摘要

为提高低雷诺数层流条件下被动式微混合器的效率，依据“三维马蹄变换”数学模型，对流体进行“挤压拉伸”“弯曲折叠”“二次折叠”和“逆变换-交集”操作，得到了一款包含6个混合单元，总长度为15 mm的混沌流微混合器。仿真研究表明：在“低流速-扩散主导”阶段

=2×10

m/s时，

=300 s后混合器进入稳定混合状态，出口处的混合指数

Outlet

=97.82%；在“中流速-湍流发展”阶段

=5×10

m/s时，

=70 s后进入稳定混合状态，经3个混合单元后混合指数

Inlet4

=98.89%；在“高流速-湍流主导”阶段

=8×10

m/s时，

=22 s后进入稳定混合状态，经2个混合单元后混合指数

Inlet3

=99.35%。采用基于面投影微立体光刻的3D打印技术整体制备了混合器芯片，借助显微镜用可视化方法对不同进样流速下的混合器性能进行了验证，示踪剂颜色变化实验结果与表面浓度云图的仿真结果一致。

Abstract

In order to improve the efficiency of passive micromixers under laminar flows at low Reynolds numbers， this study conducts a series of operations on fluids including "extrusion stretching，" "curved folding，" "secondary folding，" and "inverse transformation intersection" based on a mathematical model of 3D horseshoe transformation. The considered chaotic flow micromixer contains six mixing units with a total length of 15 mm. Simulations show that in the low flow rate-diffusion dominated stage， the mixer enters a stable state after

=300 s when

=2×10

m/s， and the mixing index

Outlet

=97.82% at the mixer outlet. In the medium velocity-turbulence development stage， the mixer enters a stable state after

=70 s when

=5×10

m/s， and the mixing index

Inlet4

=98.89% at the inlet of mixing unit 4. In the high velocity-turbulence dominated stage， the mixer enters a stable state after

=22 s when

=8×10

m/s， and the mixing index

Inlet3

=99.35% at the inlet of mixing unit 3. The entire mixer chip is fabricated as a whole by 3D printing technology based on surface projection micro-stereo lithography. The performance of the mixer at different injection flow rates is verified by visualization using a microscope. The results of the tracer color change experiment are consistent with the simulation results of the mixer surface concentration cloud map.

关键词

Keywords

references

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