Abstract
The dynamics of viscoelastic droplets and the distribution of viscoelastic fluids in symmetrical parallelized microchannels are studied by using a high-speed camera. Typical parallel and slug flows are observed. The droplet formation process is divided into four stages, and the pinch-off point of the droplet moves downstream under high dispersed phase flow rates. When the flow rate ratio of the continuous phase to the dispersed phase is very low, the expanding stage disappears and the remaining three stages gradually lose clear boundaries, and the slug flow transforms into parallel flow. The influence of fluid elasticity is manifested in the appearance of unbreakable filaments when the droplet is pinched off, and the duration and maximum length of filaments are positively correlated with the fluid elasticity. Increasing the velocity of the dispersed phase appropriately, the homogeneity of droplet generation can be effectively enhanced. Finally, a prediction model of droplet size is established.
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