Interfacial dynamics of the core-annular flow for glycerol-water solution/ionic liquid ([BMIM][PF6]) two-phase flow in a microfluidic flow-focusing junction
Interfacial dynamics of the core-annular flow for glycerol-water solution/ionic liquid ([BMIM][PF6]) two-phase flow in a microfluidic flow-focusing junction
复制标题
微流控流动聚焦连接处甘油-水溶液/离子液体 ([BMIM][PF6]) 两相流的核心-环形流的界面动力学
DOI：
10.1016/j.jtice.2018.04.033
复制
发表时间：
2019
影响因子：
5.7
通讯作者：
Huai Z Li
中科院分区：
文献类型：
--
作者：
Cai Liu;Chunying Zhu;Taotao Fu;Youguang Ma;Huai Z Li
利用高速数码相机对流动聚焦装置中不混溶流体的核-环流界面动力学进行了实验研究。芯流与包覆流的粘度比在0.14至5.22的范围内。以不同粘度（35.49 mPa·s ~ 1311.15 mPa·s）的甘油去离子水溶液为芯流，离子液体（[BMIM][PF 6]）（251.76 mPa·s）为鞘流。确定了三种流动状态：管道，凸形核-环空流动和凹形核-环空流动。确定了流型图上相邻区域的边界。研究了两相流率比、粘度比以及芯流毛细管数对核-环流型特征尺寸的影响。提出了芯流扩张长度和直径的表达式。研究结果为微流控混合、微纤维的合成以及微流控系统的设计提供了依据。
Interfacial dynamics of the core-annular flow for immiscible fluids in a flow-focusing device were experimentally investigated by using a high-speed digital camera. The viscosity ratio of the core stream to the sheathing stream ranged between 0.14 to 5.22. A series of solutions of glycerol in deionized water with various viscosities (35.49 mPa·s–1311.15 mPa·s) were used as the core stream, and the ionic liquid ([BMIM][PF6]) (251.76 mPa·s) was used as the sheathing stream. Three flow regimes were identified: tubing, convex core-annular flow and concave core-annular flow. The boundaries between adjacent regimes on flow patterns map were located. The effects of the flow rate ratio and the viscosity ratio of both phases, and the capillary number of the core stream on the characterized size of the core-annular flow were studied. The expressions are proposed for the expanding length and the diameter of the core stream. The present results provided a solid basis for microfluidic mixing, micro fiber synthesis and the design of the microfluidic system.