微反应器内牛顿/非牛顿流体液-液两相流流动和传质研究

doi:10.11949/0438-1157.20240569

摘要/Abstract

摘要：

利用传质在线表征技术研究了微通道内聚丙烯酰胺（PAAm）溶液为分散相的牛顿/非牛顿流体液-液两相流传质过程。首先探讨了两相流型，发现了一种独特的串状弹状流，并考察了PAAm浓度对弹状流、串状弹状流和环状流流型分布的影响。研究发现，牛顿流体和非牛顿流体液滴内的传质均受对流和扩散共同主导，但非牛顿流体的剪切变稀特性使液滴内的涡流和浓度分布发生显著改变。弹状液滴内的对流传质与流速、液滴长度和毛细管数相关。基于渗透理论，提出关联流量比和毛细管数的无量纲项以量化对流的影响，很好地预测了弹状流传质系数。

关键词: 多相流, 传质, 非牛顿流体, 过程强化, 微流控

Abstract:

The online mass transfer characterization technology was used to study the liquid-liquid two-phase mass transfer process of Newtonian/non-Newtonian fluid with polyacrylamide (PAAm) solution as the dispersed phase in the microchannel. The flow patterns were analyzed first. A unique sussage slug flow was observed and the effects of PAAm concentration on the flow patterns (slug flow, sussage slug flow and annular flow) were investigated. The research reveals that the mass transfer in both the Newtonian and non-Newtonian slug droplets was dominated by the convection and diffusion. However, the shear-thinning characteristics of the non-Newtonian fluid lead to significant change in the vortices and concentration distribution. The convection inside the slug droplets was affected by the flow rate, droplet length and capillary number. Based on the penetration theory, a modified correlation by relating the flow rate ratio and capillary number was proposed, which shows excellent prediction performance.

Key words: multiphase flow, mass transfer, non-Newtonian fluid, process intensification, microfluidics

中图分类号:

TQ 243

张德旺, 赵乾坤, 郭笑妮, 尧超群, 陈光文. 微反应器内牛顿/非牛顿流体液-液两相流流动和传质研究[J]. 化工学报, 2024, 75(11): 4162-4169.

Dewang ZHANG, Qiankun ZHAO, Xiaoni GUO, Chaoqun YAO, Guangwen CHEN. Flow and mass transfer characteristics of Newtonian/non-Newtonian liquid-liquid flow in a microreactor[J]. CIESC Journal, 2024, 75(11): 4162-4169.

图/表 8

图1 反应器结构与传质图片分析过程

Fig.1 Reactor structure and mass transfer picture analysis process

图2 两种PAAm溶液的流变曲线

Fig.2 The rheological curves of the two PAAm solutions

图3 三种典型流型及其分布（0.2%PAAm溶液）

Fig.3 Three typical flow patterns and their distribution (0.2% PAAm solution)

图4 液滴长度及预测关联式性能

Fig.4 Droplet length and predictive correlation performance

图5 牛顿流体(a)和非牛顿流体(b)中弹状液滴内的氧浓度分布

Fig.5 Oxygen concentration distribution within slug droplets in Newtonian fluid (a) and non-Newtonian fluid (b)

图6 串状弹状流(a)和环状流(b)的氧浓度分布

Fig.6 Oxygen concentration distribution of string slug flow (a) and annular flow (b)

图7 不同流体的传质系数

Fig.7 Mass transfer coefficients of different fluids

图8 传质预测性能：(a)传统基于渗透理论的关联式；(b)修正的关联式

Fig.8 Mass transfer prediction performance：(a) Traditional correlation based on penetration theory；(b) Modified correlation

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