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  Asymmetric coalescence of two droplets with different surface tensions is caused by capillary waves

Hack, M. A., Vondeling, P., Cornelissen, M., Lohse, D., Snoeijer, J. H., Diddens, C., et al. (2021). Asymmetric coalescence of two droplets with different surface tensions is caused by capillary waves. Physical Review Fluids, 6: 104002. doi:10.1103/PhysRevFluids.6.104002.

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 Creators:
Hack, Michiel A., Author
Vondeling, Patrick, Author
Cornelissen, Menno, Author
Lohse, Detlef1, Author              
Snoeijer, Jacco H., Author
Diddens, Christian, Author
Segers, Tim, Author
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: When two droplets with different surface tensions collide, the shape evolution of the merging droplets is asymmetric. Using experimental and numerical techniques, we reveal that this asymmetry is caused by asymmetric capillary waves, which are the result of the different surface tensions of the droplets. We show that the asymmetry is enhanced by increasing the surface tension difference, and suppressed by increasing the inertia of the colliding droplets. Furthermore, we study capillary waves in the limit of no collisional inertia. We reveal that the asymmetry is not directly caused by Marangoni forces. In fact, somehow counterintuitive, asymmetry is strongly reduced by the Marangoni effect. Rather, the different intrinsic capillary wave amplitudes and velocities associated with the different surface tensions of the droplets lie at the origin of the asymmetry during droplet coalescence.

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 Dates: 2021-10-052021
 Publication Status: Published in print
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 Identifiers: DOI: 10.1103/PhysRevFluids.6.104002
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Title: Physical Review Fluids
Source Genre: Journal
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Pages: 17 Volume / Issue: 6 Sequence Number: 104002 Start / End Page: - Identifier: ISSN: 2469-990X