449111 Study on the Transient Interfacial Tension in a Microfluidic Droplet Formation Coupling Interphase Mass Transfer Process

Monday, November 14, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Wenjie Lan, China University of Pertroleum, Beijing, Beijing, China, Shaowei Li, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, China, Che Wang, Xuqiang Guo and Guangsheng Luo, Department of Chemical Engineering, Tsinghua University, Beijing, China

In two-phase dispersion coupling interphase mass transfer process, the variation of interfacial tension is an important factor affecting the dispersion. In this study, we described a microfluidic method for the determination of the transient interfacial tension (TIFT). The method has the advantage of determining TIFT during the whole droplet formation process, rather than only at the rupture moment as reported in previous studies. The TIFTs of several systems were determined. In certain systems, it has been found that the droplet size decreased with the increase of the dispersed phase flow rate, which is obviously different from the constant interfacial tension system. It has also been found that TIFT was mainly affected by two-phase flow rates, solute type and concentration, and droplet size. A semi-empirical equation was finally established to predict TIFT. It has the potential to be used in a variety of industrial equipment with dispersion – mass transfer coupling process.

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