矩形微通道内液相黏度对气泡界面的作用机制

doi:10.16085/j.issn.1000-6613.2022-1721

化工进展 ›› 2023, Vol. 42 ›› Issue (7): 3468-3477.DOI: 10.16085/j.issn.1000-6613.2022-1721

矩形微通道内液相黏度对气泡界面的作用机制

陈蔚阳¹(), 宋欣¹, 殷亚然¹(), 张先明¹(), 朱春英², 付涛涛², 马友光²

^1.浙江理工大学材料科学与工程学院，纺织纤维材料与加工技术国家地方联合工程研究中心，浙江杭州 310018
^2.化学工程联合国家重点实验室，天津大学化工学院，天津 300072

收稿日期:2022-09-15 修回日期:2022-11-19 出版日期:2023-07-15 发布日期:2023-08-14
通讯作者: 殷亚然,张先明
作者简介:陈蔚阳（1998—），女，硕士研究生，研究方向为微反应器内过程强化。E-mail：cwy9896@163.com。
基金资助:
浙江省自然科学基金(LQ21B060009);国家自然科学基金(22008220);浙江省重点研发计划(2020C01143);浙江理工大学科研启动基金(19012403-Y)

Effect of liquid viscosity on bubble interface in the rectangular microchannel

CHEN Weiyang¹(), SONG Xin¹, YIN Yaran¹(), ZHANG Xianming¹(), ZHU Chunying², FU Taotao², MA Youguang²

^1.School of Materials Science and Engineering, Zhejiang Sci-Tech University, National & Local Joint Engineering Research Center for Textile Fiber Materials and Processing Technology, Hangzhou 310018, Zhejiang, China
^2.State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2022-09-15 Revised:2022-11-19 Online:2023-07-15 Published:2023-08-14
Contact: YIN Yaran, ZHANG Xianming

摘要/Abstract

摘要：

利用高速摄像机对矩形微通道中不同黏度体系下气泡的形状及界面演变进行实验研究。实验观察到子弹状、棒槌状、平尾状和尖尾状四种气泡形状，其中液弹的挤压力控制气泡尾部由凸形变平形或凹形，而受限空间效应和液相黏性剪切导致气泡形状为贴近壁面的尖尾状。基于两相Ca数和气液流率比绘制了气泡形状分布图并建立形状转变模型。平尾状和尖尾状气泡均是由棒槌状气泡演变而来，转变距离分别随气泡上游液弹压力和液相黏性剪切力的增加而减小，并且均与气/液流率比呈幂律关系，幂律指数小于零。尖尾状气泡破裂发生在尖端且存在临界条件，根据Ca数和气液流率比提出了破裂条件的良好预测模型。本工作对于矩形微通道内气泡的流动与破裂调控具有重要的指导意义。

关键词: 微通道, 黏度, 气-液两相流, 气泡, 变形, 破裂

Abstract:

The morphology and interface evolution of bubbles with different liquid viscosities in a rectangular microchannel were investigated by a high-speed camera. Four bubble morphologies, bullet-shaped, stick-shaped, flat-tailed and sharp-tailed, were observed. The evolution of bubble tail changed from convex to flat or concave, and to sharp near the wall were controlled respectively by the squeezing pressure of liquid slug and viscous shear under the confined space effect. Based on the two-phase Ca number and gas/liquid rate ratio, the bubble morphology distribution map was plotted and the shape transition model was established. Both the flat-tailed and sharp-tailed bubbles evolved from flat-tailed bubbles, and the transition distance decreased with the respective increase in liquid squeezing pressure and viscous shear, and showed a power-law relationship with the gas/liquid rate ratio with the negative exponent. The tips of sharp-tailed bubbles can break at the critical conditions, and a good model for predicting the breakup conditions was proposed with the Ca number and gas/liquid rate ratio. This work had important guidance for the regulation of the flow and breakup of bubbles in the rectangular microchannel.

Key words: microchannels, viscosity, gas-liquid flow, bubble, deformation, breakup

中图分类号:

TQ021.1

陈蔚阳, 宋欣, 殷亚然, 张先明, 朱春英, 付涛涛, 马友光. 矩形微通道内液相黏度对气泡界面的作用机制[J]. 化工进展, 2023, 42(7): 3468-3477.

CHEN Weiyang, SONG Xin, YIN Yaran, ZHANG Xianming, ZHU Chunying, FU Taotao, MA Youguang. Effect of liquid viscosity on bubble interface in the rectangular microchannel[J]. Chemical Industry and Engineering Progress, 2023, 42(7): 3468-3477.

图/表 13

图1 微通道结构和实验装置流程示意图

图2 气泡初始长度的稳定性分析

图3 甘油水溶液与PMMA通道芯片表面的接触角

表1 甘油水溶液的物理性质

c/%	ρ_L/kg·m^–3	μ_L/mPa·s	σ/mN·m^–1
0	998.2	1.23	33.63
20	1047.1	2.09	33.56
40	1099.1	4.00	32.75
60	1153.6	12.10	32.53
80	1208.2	62.60	32.10
90	1235.4	236.00	31.66

图4 微通道中典型的气泡形状

图5 液相黏度对微通道中气泡形状的影响

图6 微通道中气泡形状的演变过程

图7 气泡形状分布图与转变线

图8 微通道内气泡由棒槌状向平尾状的演变过程（c=40%）

图9 微通道内气泡由棒槌状向尖尾状的演变过程（c=80%）

图10 不同液相黏度下微通道内气泡形状转变规律

图11 尖尾状气泡破裂分布图及转变线

图12 尖尾状气泡破裂分布图及转变线

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矩形微通道内液相黏度对气泡界面的作用机制

Effect of liquid viscosity on bubble interface in the rectangular microchannel

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