高校化学工程学报2017，Vol.31Issue(2)：291-298,8.DOI:10.3969/j.issn.1003-9015.2017.00.011
共轴流水包油型微液滴形成过程的实验与数值模拟研究
Experimental and Numerical Investigation of Oil-in-Water Micro-Droplet Formation in a Co-Flowing System
王號元 1邓朝俊 1王翰霖 1黄卫星1
作者信息
- 1. 四川大学化学工程学院,四川成都 610065
- 折叠
摘要
Abstract
Droplet formation and droplet size of an oil-in-water system was investigated under different conditions. A numerical method based on VOF/CSF models was successfully applied to simulate droplet formation, and the results are in good agreement with that of experiments. Furthermore, the effects of two phase velocity, viscosity, interfacial tension and wall effects on droplet formation were numerically investigated.Similar as typical water-in-oil systems, the oil-in-water system also have two flow modes (dripping and jetting)in droplet generation, but the dripping mode in the oil-in-water system is happened at higher two phase velocities with good monodispersity. Meanwhile, the jetting mode appears only when disperse phase velocity becomes extremely high, and the generated droplets are usually poly-dispersed because of high instability of jetting flow in the oil-in-water system. The velocity and viscosity of the continuous phase, interfacial tension and wall effects are the most important factors that affect droplet diameters, and the first three factors can be combined using a capillary number to reflect their correlative effects. The mechanism of how these parameters affect droplet size is discussed. Finally, an empirical equation is presented to predict droplet diameter under different conditions and channel sizes.关键词
微流控/共轴流/水包油/液滴形成/液滴粒径Key words
micro-fluidics/co-flowing/oil-in-water/droplet formation/droplet diameter分类
化学化工引用本文复制引用
王號元,邓朝俊,王翰霖,黄卫星..共轴流水包油型微液滴形成过程的实验与数值模拟研究[J].高校化学工程学报,2017,31(2):291-298,8.
