When elasticity affects drop coalescence
| Autor: | Pim J. Dekker, Michiel A. Hack, Walter Tewes, Charu Datt, Ambre Bouillant, Jacco H. Snoeijer |
|---|---|
| Přispěvatelé: | Physics of Fluids, MESA+ Institute |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Physics::Fluid Dynamics
0103 physical sciences Fluid Dynamics (physics.flu-dyn) Soft Condensed Matter (cond-mat.soft) FOS: Physical sciences General Physics and Astronomy Physics - Fluid Dynamics Condensed Matter - Soft Condensed Matter 010306 general physics 01 natural sciences 22/4 OA procedure 010305 fluids & plasmas |
| Zdroj: | Physical review letters, 128(2):028004. American Physical Society |
| ISSN: | 0031-9007 |
| Popis: | The breakup and coalescence of drops are elementary topological transitions in interfacial flows. The breakup of a drop changes dramatically when polymers are added to the fluid. With the strong elongation of the polymers during the process, long threads connecting the two droplets appear prior to their eventual pinch-off. Here, we demonstrate how elasticity affects drop coalescence, the complement of the much studied drop pinch-off. We reveal the emergence of an elastic singularity, characterised by a diverging interface curvature at the point of coalescence. Intriguingly, while the polymers dictate the \emph{spatial} features of coalescence, they hardly affect the \emph{temporal} evolution of the bridge. These results are explained using a novel viscoelastic similarity analysis and are relevant for drops created in biofluids, coating sprays and inkjet printing. 5 figures |
| Databáze: | OpenAIRE |
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