液-液多相流微萃取的数值模拟和实验分析

doi:10.16085/j.issn.1000-6613.2018-2099

化工进展 ›› 2019, Vol. 38 ›› Issue (05): 2085-2092.DOI: 10.16085/j.issn.1000-6613.2018-2099

液-液多相流微萃取的数值模拟和实验分析

陈娅君¹(),龙威¹(),何永清²,周澳³

1. 昆明理工大学机电工程学院，云南昆明 650500
2. 昆明理工大学化学工程学院，云南昆明 650500
3. 昆明理工大学冶金与能源工程学院，云南昆明 650093

收稿日期:2018-10-24 修回日期:2019-01-04 出版日期:2019-05-05 发布日期:2019-05-05
通讯作者: 龙威
作者简介:<named-content content-type="corresp-name">陈娅君</named-content>（1992—），女，硕士研究生，研究方向为微机电系统。E-mail: <email>jennyajun@163.com</email>。
基金资助:
国家基金项目:自然科学基金(11502102);云南省科技厅面上项目(2018FB096);昆明理工大学分析测试基金(2017M20162103012)

Numerical simulation and experimental analysis of liquid-liquid multiphase microextraction

Yajun CHEN¹(),Wei LONG¹(),Yongqing HE²,Ao ZHOU³

1. Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
2. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Received:2018-10-24 Revised:2019-01-04 Online:2019-05-05 Published:2019-05-05
Contact: Wei LONG

摘要/Abstract

摘要：

运用Comsol软件对带有十字形和圆柱形辅助结构的微通道内两相层流进行了有限元分析。同时，以硫酸铜溶液为水相，被260^#溶剂油稀释30%的DZ988N萃取剂为有机相，并以光滑微通道为参照，开展了相关的液-液萃取实验。当给定流速在(0.5×10^-3) ~(5×10^-3) m/s范围内，圆柱形辅助结构能够促进水相中Cu²⁺的扩散，萃取效率最高，均能达到90%以上；而十字形辅助结构时而促进时而抑制水相中Cu²⁺的扩散，萃取效率不稳定，最高89.8%，最低74.6%。实验中，微通道内的两相为层流，如不考虑化学反应，Cu²⁺的扩散则仅依靠其浓度梯度差，扩散效率可表征萃取效率。有限元计算得到的扩散效率与实验获取的萃取效率值吻合良好，进一步得出了两相流场分布等流动特征，以解释不同辅助结构下的扩散效率差异。

关键词: 微流控芯片, 多相层流, 液-液萃取, 辅助结构

Abstract:

The finite element analysis of the two-phase laminar flow in the microchannel with cross-shaped and cylindrical auxiliary structures was carried out by Comsol software. Meanwhile, liquid-liquid extraction experiments were carried out with three cases including the smooth microchannel. Copper sulfate was used as the aqueous phase, and DZ988N extractent diluted to 30% by 260^# solvent oil was used as the organic phase. The cylindrical auxiliary structure promotes the diffusion of Cu²⁺ in the aqueous phase, and the extraction efficiency was the highest, which can reach more than 90%. The cross-type auxiliary structure sometimes promotes and inhibits of Cu²⁺ diffusion in the aqueous phase, and the extraction efficiency was unstable, with the highest being 89.8% and the lowest being 74.6% when the given flow rate was in the range of (0.5×10^-3) ~(5×10^-3) m/s. If chemical reaction was not considered and the two phases in the microchannel were laminar in the experiments, the diffusion of Cu²⁺ depended only on the concentration gradient , and the diffusion efficiency could characterize the extraction efficiency. The diffusion efficiency obtained by the finite element method agreed well with the experimentally obtained extraction efficiency values, and the flow characteristics such as the two-phase flow field distribution was further obtained, and the difference of diffusion efficiency under different auxiliary structures was explained.

Key words: micro-fluidic chip, multiphase laminar flow, liquid-liquid extraction, auxiliary structure

中图分类号:

TH122

陈娅君, 龙威, 何永清, 周澳. 液-液多相流微萃取的数值模拟和实验分析[J]. 化工进展, 2019, 38(05): 2085-2092.

Yajun CHEN, Wei LONG, Yongqing HE, Ao ZHOU. Numerical simulation and experimental analysis of liquid-liquid multiphase microextraction[J]. Chemical Industry and Engineering Progress, 2019, 38(05): 2085-2092.

图/表 15

图1 微通道内液液萃取工作原理

图2 微流控芯片中液-液萃取实验原理

图3 微流控芯片中液液萃取实验装置

表1 微流控芯片不同内部结构的结构尺寸

符号			双Y形对称圆柱形
L₁	30000	30000	30000
h₁	120	120	120
W₁	600	600	600
L₂	—	2000	—
L₃	—	1000	—
L₄	—	10000	10000
L₅	—	—	500
L₆	—	—	1000
L₇	—	10000	10000
r	—	—	50

图4 不同速度下微通道内混合特征

图5 不同速度下微通道内扩散实验

图6 不同入口速度下的扩散效率

图7 不同流道结构下微流道示意图

图8 不同流道结构下流场数值仿真

图9 不同流道结构下流动特性观测结果（单位：μm）

图10 不同微通道结构的扩散效率

图11 不同萃取方式下的萃取效率

图12 不同入口流速下微芯片的萃取效率

图13 不同接触时间下微芯片的萃取效率

图14 不同辅助结构下萃取效率和扩散效率的比较

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液-液多相流微萃取的数值模拟和实验分析

Numerical simulation and experimental analysis of liquid-liquid multiphase microextraction

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