Abstract
This study analyzes the breakup dynamic of fluid filament in a T-junction microchannel, including droplet stretching process, liquid filament retraction process and breakup process. The liquid filaments spontaneously evolve into droplets or break into multiple satellite droplets, which can be considered as the result of the competition between the retraction and elongation mechanisms of the liquid filaments. There is an obvious local interfacial tension difference during the shrinkage of the droplet filament, which promotes the discharge of the internal fluid, and then the filament is pinched, resulting in the formation of satellite droplets. On the basis of symmetrical filament pinch-off, and the fully considering of the influence of viscosity and the crossing flow, the elongation and retraction mechanism of droplet filaments in the microchannel are proposed. The study reveals the breakup of asymmetric liquid filaments in a microchannel and the formation of satellite droplets, which provides references for the manipulation of satellite droplets in a microchannel.
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