Abstract
The formation of microdroplets in T-inlet microchannel device was numerically simulated based on the conservation level set method. The strength of the swirling flow is evaluated by defining the average rotational angular velocity of the fluid inside the microdroplet under the condition of no shear. The differences in the evolution of swirling flow caused by the alteration of viscosity ratio at low capillary number (Ca≤0.01) were analyzed, and the influence of two-phase interfacial tension on the vortex evolution is also discussed. Numerical simulation results show that the evolution process of swirling flow in the squeezing droplets can be divided into five phases. The increase of capillary number will lead to an improvement of internal swirling intensity during the development of microdroplet. However, raising the viscosity ratio will inhibit the swirling strength. The variation of the interfacial tension between the two-phase fluids has a significant effect on the swirling intensity, the swirling intensity inside the droplet increases with increasing interfacial tension.
Published Version
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