复合型叶序微流道混合性能的数值模拟

doi:10.16085/j.issn.1000-6613.2023-1839

化工进展 ›› 2024, Vol. 43 ›› Issue (S1): 154-165.DOI: 10.16085/j.issn.1000-6613.2023-1839

复合型叶序微流道混合性能的数值模拟

张伟业¹^,²(), 朱晓武¹^,³, 罗永皓¹^,²(), 王志²

^1.沈阳工业大学材料科学与工程学院，辽宁沈阳 110870
^2.广东省科学院新材料研究所，现代材料表面工程技术国家工程实验室，广东省现代表面工程技术重点实验室，广东广州 510650
^3.温州大学机电工程学院，浙江温州 325035

收稿日期:2023-10-18 修回日期:2024-03-25 出版日期:2024-11-20 发布日期:2024-12-06
通讯作者: 罗永皓
作者简介:张伟业（1999—），男，硕士研究生，研究方向为微流体混合技术。E-mail：zwy6871361@163.com。
基金资助:
广东省科学院发展专项(2022GDASZH-2022010107);国家重点研发计划(2019BT02C629);广州市科技局项目(202007020008)

Numerical simulation of mixing performance of composite phyllotaxy microfluidic channel

ZHANG Weiye¹^,²(), ZHU Xiaowu¹^,³, LUO Yonghao¹^,²(), WANG Zhi²

^1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China
^2.Institute of New Materials, Guangdong Academy of Sciences, National Engineering Laboratory of Modern Materials Surface Engineering Technology, Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Guangzhou 510650, Guangdong, China
^3.School of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou 325035, Zhejiang, China

Received:2023-10-18 Revised:2024-03-25 Online:2024-11-20 Published:2024-12-06
Contact: LUO Yonghao

摘要/Abstract

摘要：

微混合技术以其样品体积小、消耗少、混合效率高、利于集成化等特点，在微化工、生物医药以及新能源等领域有着广阔的应用前景。目前研究中所采用的微混合器，通常无法兼顾设计复杂度与混合效率，并且基于应用导向缺乏相关的机理研究。采用数值模拟的方法能够细化混合过程，有助于对结果的机理性分析。本文建立了一种互生-轮生内向复合叶序微通道模型，通过对微通道内流速场、压力场与粒子分布的模拟结果研究，分析结构元件的引流与阻流效应，并讨论其角度、间距以及循环密度对微通道中流体流型与混合效果的影响。结果表明，流体速度矢量对不同流体的流型以及相互扩散起到关键作用，是混合效果的决定性判据。其中元件角度主要影响流体速度矢量的方向差，元件间距决定了相邻作用区域的流场耦合程度，元件循环密度则主要影响流体速度矢量方向的变化幅度，最终得出当夹角为45°、间距为2mm、循环密度为4时，混合效果能够达到98％。

关键词: 微混合流道, 复合叶序, 结构设计, 数值模拟, 流态分析

Abstract:

Micromixing technology has a broad application prospect in the fields of microchemistry, biomedicine, and new energy due to its features of small sample size, low consumption, high mixing efficiency, and ease of integration. The micro-mixer design used in current research usually fails to take into account the design complexity and mixing efficiency, and lacks the related mechanism research based on the application-oriented. The use of numerical simulation can refine the mixing process and help to mechanistically analyze the results. In this work, a mutualistic-rotational inwardly oriented composite phyllotaxy microchannel model was developed. Through the simulation results of the flow velocity field, pressure field and particle distribution in the microchannel, the diversion and obstruction effects of the structural elements were analyzed, and the influences of their angle, spacing and circulation density on the fluid flow pattern and mixing effect in the microchannel were discussed. The results showed that the fluid velocity vector played a key role in the flow pattern and mutual diffusion of different fluids, and was the decisive criterion of mixing effect. Among them, the component angle mainly affected the directional difference of the fluid velocity vector, the component spacing determines the degree of fluid-field coupling in neighboring regions of action, and the component circulating density mainly affected the change magnitude in the direction of the fluid velocity vector, it was finally concluded that the mixing effect was able to reach 98% when the angle was 45°, the spacing was 2mm, and the circulation density was 4.

Key words: micromixing channel, composite phyllotaxy, structure design, numerical simulation, flow pattern analysis

中图分类号:

TQ027.1

张伟业, 朱晓武, 罗永皓, 王志. 复合型叶序微流道混合性能的数值模拟[J]. 化工进展, 2024, 43(S1): 154-165.

ZHANG Weiye, ZHU Xiaowu, LUO Yonghao, WANG Zhi. Numerical simulation of mixing performance of composite phyllotaxy microfluidic channel[J]. Chemical Industry and Engineering Progress, 2024, 43(S1): 154-165.

图/表 16

图1 3种叶序的基本排布形态

图2 旋生叶序结构设计的微混合器

表1 常见流体介质的物性参数[27]

溶液	密度/kg∙m^-3	黏度/Pa·s
水	1000	0.001
乙醇	790	0.0015
乙二醇	1520	0.018
亚硝酸	1500~1800	0.02~0.04
模拟溶液	1500	0.01

图3 速度矢量引起的混合过程示意图

图4 粒子分布结果

图5 复合型叶序结构模型网格图

图6 不同网格数量的模拟与实验结果对比

图7 结构元件角度变化示意

图8 不同结构元件夹角对混合效果的影响

图9 不同结构元件夹角对混合流型的影响

图10 结构元件间距变化示意

图11 不同结构元件间距对混合效果的影响

图12 不同结构元件间距对混合流型的影响

图13 结构元件循环密度变化示意图

图14 循环密度变化下的粒子追踪结果

图15 循环密度变化下的速度矢量与流阻变化结果

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复合型叶序微流道混合性能的数值模拟

Numerical simulation of mixing performance of composite phyllotaxy microfluidic channel

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