Determination of interfacial tension and viscosity under dripping flow in a step T-junction microdevice

作     者：Li Ma Yongjin Cui Lin Sheng Chencan Du Jian Deng Guangsheng Luo Li Ma;Yongjin Cui;Lin Sheng;Chencan Du;Jian Deng;Guangsheng Luo

作者机构：State Key Laboratory of Chemical EngineeringDepartment of Chemical EngineeringTsinghua UniversityBeijing 100084China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2022年第35卷第2期

页      面：210-218页

核心收录：

学科分类：0710[理学-生物学] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0703[理学-化学] 

基　　金：financially supported by the National Natural Science Foundation of China (21991104) 

主　　题：Step T-junction Interfacial tension Viscosity Force balance 

摘      要：Microfluidic approaches for the determination of interfacial tension and viscosity of liquid-liquid systems still face some *** of them is liquid-liquid systems with low interfacial and high viscosity,because dripping flow in normal microdevices can’t be easily realized for the *** this work,we designed a capillary embedded step T-junction microdevice to develop a modified microfluidic approach to determine the interfacial tension of several systems,specially,for the systems with low interfacial tension and high *** method combines a classical T-junction geometry with a step to strengthen the shear force further to form monodispersed water/oil(w/o)or aqueous two-phase(ATP)droplet under dripping *** systems with low interfacial tension and high viscosity,the operating range for dripping flow is relative narrow whereas a wider dripping flow operating range can be realized in this step Tjunction microdevice when the capillary number of the continuous phase is in the range of 0.01 to ***,the viscosity of the continuous phase was also measured in the same *** different systems with an interfacial tension from 1.0 to 8.0 m N·m^(-1) and a viscosity from 0.9 to 10 m Pa·s were measured *** experimental results are in good agreement with the data obtained from a commercial interfacial tensiometer and a spinning digital *** work could extend the application of microfluidic flows.