微通道中气-液-液三相流流型及传质研究

摘要

使用双T型微通道，以体积分数为30%的磷酸三丁酯（TBP）的环己烷溶液-乙酸水溶液为萃取体系，研究了不同油水两相流量比及油水两相总流量条件下，气相的引入及气相流量分率α对流型及传质的影响，并获得总体积传质系数k_La与油水两相流量比q、气相雷诺数Re_g、液相平均雷诺数Re_M的关系式。研究结果表明，第1个T型接口处气相的引入所带来的气相剪切作用能促进第2个T型接口处分散相液滴的形成，可使液-液并行流转化为气-液-液三相弹状流；同时，由于气-液-液弹状流具有较高的相接触面积及内循环作用，传质系数k_La得到显著提高。

	Service

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	Email Alert
	RSS
	作者相关文章
	荀涛
	蔡旺锋
	张旭斌

关键词：微通道；气-液-液弹状流；流型；传质系数

Abstract：

The double T-junction microchannel was used to research the flow pattern and mass transfer of gas-liquid-liquid three phase flow in microchannel.30% TBP(in cyclohexane)-acetic acid-water was chosen as extraction system,and air as inserting gas.Effect of void fraction expressed as α (ratio of gas volume flow rate to total volume flow rate) and volume ratio of organic phase to aqueous phase expressed as q on flow regime and mass transfer were experimentally investigated.The overall volumetric mean mass transfer coefficient k_La was correlated with q,Reynolds number of gas phase Re_g and mean Reynolds number of liquid phase Re_M.With the introduction of gas,gas-liquid-liquid slug flow can be formed instead of liquid-liquid parallel flow.The mass transfer coefficient of gas-liquid-liquid slug flow is also significantly enhanced because of the high dispersion of two immiscible liquid phase and the internal circulation effect.

Keywords： microchannel； gas-liquid-liquid slug flow； flow pattern； mass transfer coefficient

Received 2016-04-12;

Corresponding Authors: 张旭斌,E-mail:tjzxb@tju.edu.cn。 Email: tjzxb@tju.edu.cn

About author: 荀涛(1991-),男,硕士研究生,现从事微通道内流型及传质方面的研究。

引用本文:

荀涛, 蔡旺锋, 张旭斌.微通道中气-液-液三相流流型及传质研究[J]. 化学工业与工程, 2017,34(6): 81-87

Xun Tao, Cai Wangfeng, Zhang Xubin.The Flow Pattern and Mass Transfer of Gas-Liquid-LiquidThree Phase Flow in Microchannel[J]. Chemcial Industry and Engineering, 2017,34(6): 81-87

[1] Ciceri D, Perera J M, Stevens G W. The use of microfluidic devices in solvent extraction[J]. Journal of Chemical Technology & Biotechnology, 2014, 89(6):771-786
[2] Zhao Y, Chen G, Yuan Q. Liquid-Liquid two-phase mass transfer in the T-junction microchannels[J]. AIChE Journal, 2007, 53(12):3042-3053
[3] Lee P, Garimella S V, Liu D. Investigation of heat transfer in rectangular microchannels[J]. International Journal of Heat and Mass Transfer, 2005, 48(9):1688-1704
[4] 方庆海,张香文. 再生冷却微通道内超临界高压热裂解正辛烷的产物分布及动力学[J].化学工业与工程, 2015, 32(2):37-42 Fang Qinghai,Zhang Xiangwen. Thermal decomposition of n-octane in regenerative cooling microchannels at Supercritical Conditions:Product distributions and kinetics[J]. Chemical Industry and Engineering, 2015, 32(2):37-42(in Chinese)
[5] 李根浩, 袁希钢, 宋文琦. 捕捉微通道内Taylor流特性的一种渐变网格划分方法(英文)[J]. 化学工业与工程, 2016, 33(5):86-95 Li Genhao,Yuan Xigang,Song Wenqi. Gradient mesh approach for capturing characteristics of gas-liquid taylor flow in microchannels[J]. Chemical Industry and Engineering, 2015, 32(2):37-42(in Chinese)
[6] 唐静, 张旭斌, 蔡旺锋, 等. 微通道内液-液两相流研究进展[J]. 化工进展, 2013,8:1743-1748 Tang Jing, Zhang Xubin, Cai Wangfeng, et al. A review of the research of liquid-liquid two phase flow in microchannel[J]. Chemical industry and Engineering Progresss, 2013,8:1743-1748(in Chinese)
[7] Aoki N, Tanigawa S, Mae K. A new index for precise design and advanced operation of mass transfer in slug flow[J]. Chemical Engineering Journal, 2011, 167(2/3):651-656
[8] Kashid M N, Agar D W. Hydrodynamics of liquid-liquid slug flow capillary microreactor:Flow regimes, slug size and pressure drop[J]. Chemical Engineering Journal, 2007, 131(1/3):1-13
[9] Harries N, Burns J R, Barrow D A, et al. A numerical model for segmented flow in a microreactor[J]. International Journal of Heat and Mass Transfer, 2003, 46(17):3313-3322
[10] Kashid M N, Renken A, Kiwi-Minsker L. Influence of flow regime on mass transfer in different types of microchannels[J]. Industrial & Engineering Chemistry Research, 2011, 50(11):6906-6914
[11] Xu B, Cai W, Liu X, et al. Mass transfer behavior of liquid-liquid slug flow in circular cross-section microchannel[J]. Chemical Engineering Research and Design, 2013, 91(7):1203-1211
[12] Wang K, Lu Y, Tan J, et al. Generating gas/liquid/liquid three-phase microdispersed systems in double T-junctions microfluidic device[J]. Microfluidics and Nanofluidics, 2010, 8(6):813-821
[13] Wang K, Kang Q, Lu Y. Gas/liquid/liquid three phase flow patterns and bubble/droplet size laws in a double T-junction microchannel[J]. AIChE Journal, 2015, 61(5):1722-1734
[14] Tang J, Zhang X, Cai W, et al. Liquid-Liquid extraction based on droplet flow in a vertical microchannel[J]. Experimental Thermal and Fluid Science, 2013, 49:185-192