74th Annual Meeting of the APS Division of Fluid Dynamics (November 21, 2021 — November 23, 2021)

P0031: Pinch-off of complex suspension drops

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Authors

• Virgile Thievenaz, University of California, Santa Barbara
• Alban Sauret, University of California, Santa Barbara

DOI: https://doi.org/10.1103/APS.DFD.2021.GFM.P0031

When a drop detaches from a nozzle, the neck thins down and enventually breaks. This thinning dynamics is known to follow several self-similar regimes depending on the relative magnitude of surface tension, viscosity and inertia. Previous studies have shown that the detachment of particle-laden drops is similar to that of a viscous fluid, up to a point when particles accelerate the pinch-off. However, suspensions encountered in industrial or environmental flows are usually complex. If the particles have a range of sizes, the effective viscosity decreases and the drop detaches faster. If a polymer is dissolved in the interstial liquid, its chains feel a higher effective stress because of the particles. Thus, such a suspension exhibit a visco-elastic dynamics more easily. This poster presents these different possible dynamics.