Abstract
Bubble formation in high-viscosity liquids in step-emulsification microdevices is presented. Nitrogen is used as the dispersed phase. Glycerol aqueous solutions with concentration more than 60% (w/w) are used as the continuous phase to show the effect of high viscosity liquid. It was found that the transition of flow patterns of gas–liquid two-phase flow can be divided into two categories: bubbly flow and parallel flow. Compared with the cases in low viscosity liquid, the wettability with wall was deteriorated and the resistance in chamber were enhanced, greatly. All of these effects cause different performance of interface evolution during bubble formation and the volume and formation frequency after pinching off. Therefore, the relative magnitude of pressure variation between chamber and gas inlet was changed to affect the flow pattern and monodispersity when the operation conditions were changed.
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