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Noncoalescence of Sessile Drops from Different but Miscible Liquids : Hydrodynamic Analysis of the Twin Drop Contour as a Self-Stabilizing Traveling Wave

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2012

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Riegler, Hans

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https://doi.org/10.1103/physrevlett.109.066103
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Physical Review Letters. American Physical Society (APS). 2012, 109(6), 066103. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/physrevlett.109.066103

Zusammenfassung

Capillarity always favors drop fusion. Nevertheless, sessile drops from different but completely miscible liquids often do not fuse instantaneously upon contact. Rather, intermediate noncoalescence is observed. Two separate drop bodies, connected by a thin liquid neck, move over the substrate. Supported by new experimental data, a thin film hydrodynamic analysis of this state is presented. Presumably advective and diffusive volume fluxes in the neck region establish a localized and temporarily stable surface tension gradient. This induces a local surface (Marangoni) flow that stabilizes a traveling wave, i.e., the observed moving twin drop configuration. The theoretical predictions are in excellent agreement with the experimental findings.

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ISO 690KARPITSCHKA, Stefan, Hans RIEGLER, 2012. Noncoalescence of Sessile Drops from Different but Miscible Liquids : Hydrodynamic Analysis of the Twin Drop Contour as a Self-Stabilizing Traveling Wave. In: Physical Review Letters. American Physical Society (APS). 2012, 109(6), 066103. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/physrevlett.109.066103
BibTex
@article{Karpitschka2012Nonco-67067,
  year={2012},
  doi={10.1103/physrevlett.109.066103},
  title={Noncoalescence of Sessile Drops from Different but Miscible Liquids : Hydrodynamic Analysis of the Twin Drop Contour as a Self-Stabilizing Traveling Wave},
  number={6},
  volume={109},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Karpitschka, Stefan and Riegler, Hans},
  note={Article Number: 066103}
}
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