基于VOF-CSF方法的微流控法生成双乳液滴过程数值研究  

Numerical study of microfluidic method for the generation of double emulsion droplets based on VOF-CSF method

作　　者：牛玉龙 杨磊 朱江 NIU Yulong;YANG Lei;ZHU Jiang(School of Automobile and Traffic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学汽车与交通工程学院,安徽合肥230009

出　　处：《合肥工业大学学报(自然科学版)》2025年第4期537-543,548,共8页Journal of Hefei University of Technology:Natural Science

基　　金：安徽省自然科学基金资助项目(JZ2019AKZR0218)。

摘　　要：文章采用体积函数法和连续表面力(volume of fluid-continuum surface force,VOF-CSF)数值模型对同轴对冲聚焦玻璃毛细管生成双乳液滴的过程进行数值模拟,并通过文献实验照片对照的方式确定数值模型的合理性,且能够预测双乳液滴形成的动力学过程;同时研究了黏度、界面张力及流量对液滴大小、流动形态及断裂位置的影响。结果表明:外相以及内相黏度过小会对双乳液滴的生成造成明显影响,前者生成更小的双乳液滴,后者会在合适的流动比下生成多核液滴;界面张力的增加会抑制相关界面的射流,使流体从喷射态朝滴态转变,且较易生成液滴;外相流量主要影响液滴的粒径大小,流量越大,粒径减小,而中间相流量和内相流量的变化主要影响液滴的核壳比。In this paper,the volume of fluid-continuum surface force(VOF-CSF)numerical model was used to numerically simulate the generation process of double emulsion droplets in coaxially hedged focusing glass capillaries.The rationality of the numerical model was confirmed by comparing the experimental photos in the literature and calculated results,which could predict the kinetic process of double emulsion droplet formation.The effects of viscosity,interfacial tension and flow rate on droplet size,flow pattern and fracture position were investigated.The results show that the generation of double emulsion droplets will be significantly affected by the low viscosity of the outer phase and the inner phase.The former will generate smaller double emulsion droplets,while the latter will generate multi-nucleated droplets at a suitable flow ratio.The increase of the interfacial tension will inhibit the jet at the relevant interface,so that the fluid pattern changes from the jet state to the drop state,which makes easier generation of the droplets.The outer phase flow rate mainly affects the size of the droplets.The larger the flow rate is,the smaller the size is,while the change of the flow rate of the middle phase and the inner phase mainly affects the core-shell ratio of the droplets.

关 键 词：双乳液滴 微流控法 数值模拟 同轴流动 

分 类 号：O359[理学—流体力学]