This paper introduces an experimental study on the microbubble generation mechanism in a co-flowing microfluidic device. Using propane, butane and air as the dispersed phases and different SDS-PEG solutions as the continuous phases, two kinds of bubble generating phenomena, named "single-bubble generation" flow and "dual-bubble generation" flow, were observed in experiment and uniform bubbles with average diameters ranging from 391. μm to 713. μm and polydispersity less than 2.9% were successfully prepared. The pressure fluctuation of gas phase is carefully analyzed with the Young-Laplace equation and the bubble generation mechanism is summarized from the dynamic movement of gas-liquid interface. The main factors impacting the bubble size variation are illustrated for both the organic and inorganic gases. A universal correlation is established to predict the average bubble diameters. © 2013 Elsevier Ltd.
CITATION STYLE
Wang, K., Xie, L., Lu, Y., & Luo, G. (2013). Generating microbubbles in a co-flowing microfluidic device. Chemical Engineering Science, 100, 486–495. https://doi.org/10.1016/j.ces.2013.02.021
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