“一步法”微流控制备大直径复合乳粒中几何尺寸调控规律研究

doi:10.11949/0438-1157.20190413

化工学报 ›› 2019, Vol. 70 ›› Issue (12): 4617-4624.DOI: 10.11949/0438-1157.20190413

“一步法”微流控制备大直径复合乳粒中几何尺寸调控规律研究

徐兰^1,²(),潘大伟^1,²,邓朝俊³,黄卫星¹(),刘梅芳²()

1. 四川大学化学工程学院，四川成都 610065
2. 中国工程物理研究院激光聚变研究中心，四川绵阳 621900
3. 中国核动力研究设计院核反应堆系统设计技术重点实验室，四川成都 610041

收稿日期:2019-04-18 修回日期:2019-09-03 出版日期:2019-12-05 发布日期:2019-12-05
通讯作者: 黄卫星,刘梅芳
作者简介:徐兰（1994—），女，硕士研究生，18428374312@163.com
基金资助:
国家自然科学基金项目(5170321242020619);环境友好能源材料国家重点实验室开放基金项目(2018kfhg03)

Controlled size production of large double droplets in one-step microfluidic devices

Lan XU^1,²(),Dawei PAN^1,²,Chaojun DENG³,Weixing HUANG¹(),Meifang LIU²()

1. School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China
2. Research Center of Laser Fusion, CAEP, Mianyang 621900, Sichuan, China
3. National Key Laboratory of Reactor System Design Technology, Nuclear Power Institute of China, Chengdu 610041, Sichuan, China

Received:2019-04-18 Revised:2019-09-03 Online:2019-12-05 Published:2019-12-05
Contact: Weixing HUANG,Meifang LIU

摘要/Abstract

摘要：

复合乳粒几何尺寸的精密调控对于实现特定规格参数要求的聚合物空心微球的可控制备具有重要意义。基于“一步法”微流控装置，通过大量的实验获得了以油相与内水相流量比R和连续相毛细管数Ca为变量的复合乳粒构建操作区域图，并在能稳定形成复合乳粒区域范围内探讨了Ca、R以及管道尺寸对大直径复合乳粒几何尺寸的影响规律。实验结果表明：随着连续相毛细管数增大，复合乳粒几何尺寸(内径、外径和壁厚)均减小；随着油相与内水相流量比增大，复合乳粒内径减小，壁厚增大，而外径则呈现先减小后增大的趋势。此外，复合乳粒几何尺寸随管道直径增大而增大，且存在极限尺寸。实验结果可为单分散大直径复合乳粒的定量可控制备提供实验设计依据。

关键词: 微通道, 多相流, 流体动力学, 复合乳粒, 惯性约束聚变

Abstract:

The precise regulation of the composite latex geometry is important for the controllable preparation of polymer hollow microspheres to achieve specific specifications. Based on one-step microfluidic device, extensive experiments for double droplet preparation are conducted and the flow pattern diagram dependent on capillary number of continuous phase, Ca _W2, and the flow rate ratio of oil phase to inner phase, R _O/W1, is obtained, and further the effects of the Ca, R _O/W1 and the diameter of external phase tube on the large double droplets size are discussed in this work. As Ca _W2 increases, the droplet sizes, regarding inner diameter, shell thickness and outer diameter, decrease because of a large drag force generated by a continuous phase. With the R _O/W1 increasing, the inner diameter decreases, while the shell thickness increases. However, as for the outer diameter of such double droplet, it initially decreases and then increases. In addition, the droplet sizes increase as the tube diameter increases under the same flow rate of all three phases, but it is always limited by the tube diameter. The present work could provide some guidelines for controllable and precise fabrication of double droplets with large diameter.

Key words: microchannels, multiphase flow, hydrodynamics, double droplets, inertial confinement fusion

中图分类号:

TQ 021.1

徐兰, 潘大伟, 邓朝俊, 黄卫星, 刘梅芳. “一步法”微流控制备大直径复合乳粒中几何尺寸调控规律研究[J]. 化工学报, 2019, 70(12): 4617-4624.

Lan XU, Dawei PAN, Chaojun DENG, Weixing HUANG, Meifang LIU. Controlled size production of large double droplets in one-step microfluidic devices[J]. CIESC Journal, 2019, 70(12): 4617-4624.

图/表 12

图1 实验装置图

Fig.1 Schematic of experimental devices

图2 复合乳粒内/外径定义

Fig.2 Definition of inner and outer diameter of double droplets

图3 复合乳粒直径分布

Fig.3 Diameter distribution of double droplets

表1 外水相管道尺寸

Table 1 Structural parameters of external tubes

管道	管道尺寸(内径/外径)/μm	外水相操作流量/(ml/h)
1号管	2380/2800	70、100、150、300、500
2号管	3315/4340	130、194、300、582、970
3号管	4046/4798	190、289、450、867、1445

图4 复合乳粒构建操作区域

Fig.4 Flow pattern for double droplets generation

图5 复合乳粒破裂过程（a）和稳定形成过程（b）

Fig.5 Breakage process（a） and stable formation process （b）of double droplets

图6 喷射流形成过程（a）和喷射流工况下产生的复合乳粒（b）

Fig.6 Generation process of jetting regime（a） and double droplets fabricated in jetting regime（b）

图7 R O/W1较小时薄壁复合乳粒的显微照片

Fig.7 Optical images of double droplets with thin thickness at low R O/W1

图8 R O/W1过大时出现实心液滴

Fig.8 Appearance of single droplet of oil phase at high R O/W1

图9 Ca W2对复合乳粒几何尺寸的影响

Fig.9 Effects of Ca W2 on droplet size

图10 R O/W1对复合乳粒几何尺寸的影响(1号管，Q W2=100 ml/h)

Fig.10 Effects of R O/W1 on droplet size (No.1 tube, flow rate of external phase is 100 ml/h)

图11 不同管道中外水相流速对复合乳粒几何尺寸的影响

Fig.11 Effects of external phase flow rate on droplet size in different tubes

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“一步法”微流控制备大直径复合乳粒中几何尺寸调控规律研究

Controlled size production of large double droplets in one-step microfluidic devices

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