毛细管中液液弹状流的流体力学数值模拟  

Numerical Simulation on Hydrodynamics of Liquid-Liquid Slug Flow in Capillary

作　　者：宋洪利 王燕飞[2] 许松林 

机构地区：[1]天津大学化工学院,系统生物工程教育部重点实验室,天津300350 [2]中国检验检疫科学研究院,北京100176

出　　处：《高校化学工程学报》2018年第1期54-60,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家重点研发计划(2016YFF0203802);中国检科院基本科研业务费(2016JK017).

摘　　要：随着精细加工技术的进步和新材料的出现,微柱液相色谱又称毛细管液相色谱在分离和分析过程中发挥着越来越重要作用。对于毛细管中的两相流流动,弹状流是最常见也是最稳定的流型之一。文章介绍了毛细管中液液弹状流的数值模拟。以直径为0.2 mm的T型毛细管为模型,使用商用计算流体力学(CFD)Fluent(16.2)软件研究弹状流的液弹长度、液膜厚度、液弹速度等流体力学特性。确定液弹长度与两相流率、毛细管数等参数有关。液弹长度随分散相流率增加而变大,随连续相流率和毛细管数的增大而减小。液膜厚度与文献中的计算模型吻合很好。液弹速度随混合速度的增大而增大。根据模拟数据得到液弹长度与液弹速度的关联式,且与文献实验值比较,结果吻合性较好。With the advancement of microfabrication techniques and emergency of new materials, microcolumn liquid chromatography(or capillary liquid chromatography) has shown potential application in separation and analysis. Slug flow is one of the most common and stable flow patterns for two phase flow in capillary. Numerical simulation of liquid-liquid slug flow in capillary was studied and a T-junction empty capillary with diameter of 0.2 mm was used. Commercial computational fluid dynamics(CFD) package FLUENT(Release16.2) was used to investigate the hydrodynamics of slug flow including slug length, the thickness of liquid film and slug velocity. The dependence of slug length on flow rates and other parameters like capillary number was determined. The results show that slug length increases as the flow rate of the dispersed phase increases, and it decreases as the flow rate of the continuous phase and capillary number increase. The film thickness is well predicted by available models. Correlation of slug length and slug velocity is developed based on the simulated data which has good agreement with the experimental data.

关 键 词：毛细管液相色谱 液液弹状流 计算流体力学 流体力学 

分 类 号：TQ021.1[化学工程]