温度对微通道中液滴形成的影响规律  

Effect of temperature on droplet formation in a co-axial microchannel

作　　者：刘畅[1] 兰文杰[1] 徐建鸿[1] 骆广生[1] 

机构地区：[1]清华大学化学工程联合国家重点实验室,北京100084

出　　处：《中国科技论文》2012年第6期409-412,共4页China Sciencepaper

基　　金：国家自然科学基金资助项目(21036002);高等学校博士学科点专项科研基金资助项目(20090002110070)

摘　　要：在可控温的同轴环管型微通道中,以DMF/硅油体系作为研究对象,通过改变两相流量和温度来考察同轴环管型微通道内液滴形成规律,进行了液滴形成过程的理论分析。并根据体系黏度和界面张力随温度的变化在现有液滴直径预测模型的基础上进行修正,得到了液滴直径随温度变化的表达式,进而建立了更加准确的数学预测模型。研究结果表明,温度可以替代两相流量比作为调节液滴尺寸的另一途径。而且对于黏度随温度的变化与界面张力随温度的变化相差越大的体系,该调控效果越明显。This paper describes a fundamental study on the droplet formation in a microfluidic device with temperature-control function using DMF/Silicone oil as working system. The effects of temperature and flow rate of continuous phase on the droplet formation and size manipulation were explored. Besides, the scaling of droplet size was analyzed and a semi-empirical model was established to predict the droplet size by modifying the existing model with viscosity and interfacial tension＇s dependence on temperature. The results show that the droplet size can be controlled by changing temperature especially for systems that have a viscosity varying sharply with temperature.

关 键 词：微通道 液滴形成 温度 

分 类 号：O359.1[理学—流体力学]