摘要
本文以竖直共轴微通道为研究对象,采用液态金属为分散相、海藻酸钠溶液(1wt%)为连续相,二者在微通道内形成两相流,改变分散相流量和固定连续相流量,通过高速摄影技术对微滴形成过程进行拍摄分析。复合微滴形成经历了滴流包覆(Dripping)、柱塞流包覆(Squeezing)、复合射流(Compound Jetting)三种模式。根据实验数据,绘制出以连续相流量为横坐标、分散相流量为纵坐标的流型分布图。发现固定连续相Qc,改变分散相流量Qd对微滴产生频率fd、连续相悬滴包覆分散相微滴数目n、微滴产生机理有明显影响。只有在滴流包覆(Dripping)模式下,才能获得均匀的复合微滴。
The vertical coaxial microchannels are used as research objects. The liquid metal at room temperature is used as the dispersed phase and sodium alginate solution( 1 wt%) as the continuous phase. The two forms a two-phase flow in the microchannel. The changed the flow of the dispersed phase and the fixed continuous phase flow rate,the shooting process of the dispersed phase droplet formation process was performed by a high speed camera. The compound droplets exhibit three modes of Dripping,Squeezing,and Compound jetting. According to the experimental data,a flow pattern with the continuous phase flow as the abscissa and the dispersed phase flow as the ordinate is plotted. It was found that the fixed continuous phase flow rate Qcand changed the flow rate Qdof the dispersed phase had a significant influence on the frequency fdof the dispersed phase droplets,the number n of suspended droplets coated droplets,and the flow pattern. Uniform compound droplets can only be obtained in Dripping mode.
作者
渠国洋
艾凯
张金松
Qu Guoyang;Ai Kai;Zhang Jinsong
出处
《计量与测试技术》
2019年第7期24-27,共4页
Metrology & Measurement Technique
关键词
共轴微通道
液态金属
两相流
复合微滴
room temperature liquid metal
compound droplet
two - phase flow
coaxial microchannel
