方波型微混合器内的流动特性及其影响因素研究

引用本文: 刘赵淼, 赵思宇, 赵晟, 殷参, 徐迎丽, 逄燕. 方波型微混合器内的流动特性及其影响因素研究[J]. 分析化学, 2021, 49(10): 1666-1677. doi: 10.19756/j.issn.0253-3820.210515 shu

Citation: LIU Zhao-Miao, ZHAO Si-Yu, ZHAO Sheng, YIN Shen, XU Ying-Li, PANG Yan. Study on Flow Characteristics and Influencing Factors in Square Wave Micromixer[J]. Chinese Journal of Analytical Chemistry, 2021, 49(10): 1666-1677. doi: 10.19756/j.issn.0253-3820.210515 shu

方波型微混合器内的流动特性及其影响因素研究

刘赵淼 ^1,2, ,
赵思宇 ^1,2, ,
赵晟 ^1,2, ,
殷参 ^3, ,
徐迎丽 ^3, ,
逄燕 ^{1,2,
,}

1.
北京工业大学材料与制造学部, 北京 100124;
2.
北京工业大学先进制造技术北京重点实验室, 北京 100124;
3.
北京卫星制造厂, 北京 100080

通讯作者: 逄燕,E-mail:pangyan@bjut.edu.cn

基金项目:
国家自然科学基金项目（Nos.11872083，11702007）资助。

摘要: 微混合器通常为实验室芯片（LOC）的前处理装置，研究其混合机理及结构对混合性能的影响规律，可为微混合器的设计加工提供指导。本研究考察了通道雷诺数（Re）在0.1~80时方波型微混合器的内部流动特性，并在分子扩散主导和对流扩散主导阶段分析了通道结构对流体流动及混合性能的影响。结果表明，随通道中Re的增大，流体混合从分子扩散主导过渡到对流扩散主导阶段。分子扩散主导阶段，影响流体混合强度的因素为特征扩散长度，通道宽度比通道高度对混合强度的影响程度更大，通道宽度的缩小可以显著提升分子扩散阶段流体的混合强度。当Re=0.5时，通道宽度从400 μm缩小到200 μm后，混合强度提升了34.59%。对流扩散主导阶段，在通道转弯处所产生旋涡的大小和强度影响混合强度，正方形截面的方波型微混合器旋涡发展最充分、混合性能最优，缩小正方形截面的尺寸可以增大旋涡强度、利于混合强度的提升。当Re=80时，通道截面边长为200 μm的微混合器比边长为300 μm的微混合器混合强度提高了22.71%。

关键词:

English

Study on Flow Characteristics and Influencing Factors in Square Wave Micromixer

1.
College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China;
2.
Beijing Key Laboratory of Advanced Manufacturing Technology, Beijing University of Technology, Beijing 100124, China;
3.
Beijing Spacecrafts, Beijing 100080, China

Corresponding author: PANG Yan, pangyan@bjut.edu.cn

Received Date: 10 May 2021
Revised Date: 06 August 2021
Fund Project:
Supported by the National Natural Science Foundation of China (Nos.11872083, 11702007).

Abstract: The micro-mixer is usually a pre-treatment device for laboratory chip (LOC). The study on the influence of mixing mechanism and structure on mixing can provide guides for design and processing of micromixers. In this work, the flow characteristics and mixing mechanism in the square wave micromixer were studied when the channel Re ynolds number was between 0.1 and 80, and the influence of channel structure on the flow and mixing performance of the fluid in the molecular diffusion dominant phase and the convection diffusion dominant phase was analyzed. The results showed that with the increase of Re in the channel, the fluid mixing transitions from molecular diffusion dominated to convection diffusion dominated stage. The factor that influenced the fluid mixing index during the dominant phase of molecular diffusion was the characteristic diffusion length. The channel width had a greater impact on the mixing index than the channel height. The reduction of the channel width could significantly increase the mixing index in the molecular diffusion phase. At Re=0.5, the mixing index was increased by 34.59% when the channel width was reduced from 400 μm to 200 μm. The factor affecting the mixing index in the dominant phase of convection diffusion was the magnitude and intensity of the vortex generated by the centrifugal force at the turn of the microchannel. The vortex of the square wave micromixer with square section had the most fully developed vortex and the best mixing performance. Reducing the size of the square section could increase the vortex strength. At Re=80, the mixing index of the micromixer with a channel section side length of 200 μm was 22.71% higher than the side length of 300 μm.

Key words:

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

方波型微混合器内的流动特性及其影响因素研究

通讯作者: 逄燕,E-mail:pangyan@bjut.edu.cn

English

Study on Flow Characteristics and Influencing Factors in Square Wave Micromixer

Corresponding author: PANG Yan, pangyan@bjut.edu.cn

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

方波型微混合器内的流动特性及其影响因素研究

通讯作者: 逄燕,E-mail:pangyan@bjut.edu.cn

English

Study on Flow Characteristics and Influencing Factors in Square Wave Micromixer

Corresponding author: PANG Yan, pangyan@bjut.edu.cn

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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