Journal
CHEMICAL ENGINEERING SCIENCE
Volume 65, Issue 12, Pages 3739-3748Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2010.03.012
Keywords
Bubble formation; Microfluidic T-junction; Squeezing-to-dripping; Slug bubble; Dispersed bubble; Two-step model
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Funding
- National Nature Science Foundation of China [20876107]
- State Key Laboratory of Chemical Engineering [SKL-ChE-08B06]
- Program of Introducing Talents of Discipline to Universities [B06006]
- China Scholarship Council
- French Embassy in China
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The aim of this paper is to investigate the squeezing-to-dripping transition for bubble formation in a microfluidic T-junction by cross-flowing rupture technique using a high-speed digital camera. Experiments were conducted in a glass microfluidic T-junction with the cross-section of the microchannel of 120 mu m wide and 40 mu m deep. N-2 bubbles were generated in glycerol-water mixtures with several concentrations of surfactant sodium dodecyl sulfate (SDS). Three different regimes were identified for generating different kinds of bubbles: squeezing, dripping and transition regimes. Various forces exerted on the gaseous thread in different regimes were analyzed. Long slug bubbles were formed in the squeezing regime, while dispersed bubbles in the dripping regime. The transition regime formed short slug bubbles. The bubble sizes in various regimes could be correlated with several dimensionless numbers such as the ratio of gas/liquid flow rates and capillary number. The two-step model for droplets (Steegmans et al., 2009) was extended to describe the bubble formation. (C) 2010 Elsevier Ltd. All rights reserved.
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