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Stick-slip contact line motion on Kelvin-Voigt model substrates

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2022

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Mokbel, Dominic
Aland, Sebastian

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EPL (Europhysics Letters). IOP Publishing. 2022, 139(3), 33002. ISSN 0295-5075. eISSN 1286-4854. Available under: doi: 10.1209/0295-5075/ac6ca6

Zusammenfassung

The capillary traction of a liquid contact line causes highly localized deformations in soft solids, tremendously slowing down wetting and dewetting dynamics by viscoelastic braking. Enforcing nonetheless large velocities leads to the so-called stick-slip instability, during which the contact line periodically depins from its own wetting ridge. The mechanism of this periodic motion and, especially, the role of the dynamics in the fluid have remained elusive, partly because a theoretical description of the unsteady soft wetting problem is not available so far. Here we present the first numerical simulations of the full unsteady soft wetting problem, with a full coupling between the liquid and the solid dynamics. We observe three regimes of soft wetting dynamics: steady viscoelastic braking at slow speeds, stick-slip motion at intermediate speeds, followed by a region of viscoelastic braking where stick-slip is suppressed by liquid damping, which ultimately gives way to classical wetting dynamics, dominated by liquid dissipation.

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ISO 690MOKBEL, Dominic, Sebastian ALAND, Stefan KARPITSCHKA, 2022. Stick-slip contact line motion on Kelvin-Voigt model substrates. In: EPL (Europhysics Letters). IOP Publishing. 2022, 139(3), 33002. ISSN 0295-5075. eISSN 1286-4854. Available under: doi: 10.1209/0295-5075/ac6ca6
BibTex
@article{Mokbel2022Stick-67247,
  year={2022},
  doi={10.1209/0295-5075/ac6ca6},
  title={Stick-slip contact line motion on Kelvin-Voigt model substrates},
  number={3},
  volume={139},
  issn={0295-5075},
  journal={EPL (Europhysics Letters)},
  author={Mokbel, Dominic and Aland, Sebastian and Karpitschka, Stefan},
  note={Article Number: 33002}
}
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