Abstract
Dynamics of water-high-viscosity ionic liquid ([BMIM][PF6]) two-phase flow in a flow-focusing device were investigated by using a high-speed digital camera. Four flow regimes were identified: dripping, jetting, irregular and string of sausages. The rupture of the dispersed thread could be divided into the squeezing and the pinch-off stages. The complex wavy interfacial phenomena – string of sausages were observed and highlighted. The size of the droplet and sausage were predicted respectively by a power-law function with the flow rate ratio and the capillary number.
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