Dynamics and interfacial evolution for bubble breakup in shear-thinning non-Newtonian fluid in microfluidic T-junction
Dynamics and interfacial evolution for bubble breakup in shear-thinning non-Newtonian fluid in microfluidic T-junction
复制标题
微流体 T 形接头中剪切稀化非牛顿流体中气泡破裂的动力学和界面演化
DOI：
10.1016/j.ces.2019.115158
复制
发表时间：
2019
影响因子：
4.7
通讯作者：
Huai Z.Li
中科院分区：
文献类型：
--
作者：
Hao Zhou;Chunying Zhu;Taotao Fu;Youguang Ma;Huai Z.Li
研究了微流控T型接头中剪切变稀非牛顿流体中气泡破碎的动力学和界面演化。气泡破碎过程包括挤压、过渡和快速夹断三个阶段。三个阶段的最小泡颈宽度与时间或剩余时间呈幂律关系。与牛顿流体中的气泡破碎相比，CMC溶液在非牛顿流体中的挤压阶段缩短，且随着CMC溶液流动指数的减小，挤压阶段的幂律指数增大。气泡尖端长度随时间呈线性拉伸，拉伸率随CMC溶液浓度的增加而增大。结果表明，CMC溶液的流变性对微流控T型接头中气泡的破碎过程有显著影响。
The dynamics and interfacial evolution for bubble breakup in shear-thinning non-Newtonian fluids in microfluidic T-junction were investigated. The bubble breakup process includes three stages: squeezing, transition and rapid pinch-off stages. The minimum widths of the bubble neck in three stages exhibit a power-law relationship with the time or remaining time. Compared to bubble breakup in Newtonian fluid, the squeezing stage shortens in non-Newtonian fluid, and the power-law exponent of the rapid pinch-off stage increases with the decrease of the flow index of the CMC solutions. The length of the bubble tip is linearly stretched with time, and the elongation rate increases with the concentration of CMC solution. The results show that the rheological property of the CMC solution could significantly affect the bubble breakup process in the microfluidic T-junction.