Seminar über aktuelle Fragen zur Dynamik komplexer Fluide: When honey moves faster than water

Seminar über aktuelle Fragen zur Dynamik komplexer Fluide

  • Datum: 05.02.2021
  • Uhrzeit: 10:15 - 11:15
  • Vortragende(r): Matilda Backholm
  • Aalto University, Helsinki, Finland
  • Ort: Max-Planck-Institut für Dynamik und Selbstorganisation (MPIDS)
  • Raum: Video conference at, Meeting ID: 980 3913 9623, Passcode: 050762
  • Gastgeber: MPIDS/DCF
  • Kontakt:
The viscosity of a fluid is well known to limit its flow: the more viscous a droplet, the slower it moves [1,2]. Here, we show that this intuitive rule breaks down in a confined liquid-repellent geometry. A gravity-driven, highly viscous glycerol droplet placed in a sealed superhydrophobic capillary moves more than 10 times faster than a low-viscosity water droplet [3]. This anomalous, viscosity-enhanced droplet motion is caused by a viscosity-suppressed deformation of the droplet-air interface. We find that the air film (plastron) trapped within the micro/nanostructure of the superhydrophobic coating plays an interesting and important role in controlling fluid flow beyond a mere reduction in contact area and friction.

[1] D. Richard and D. Quéré, Europhys. Lett. 48 (1999).
[2] T. Mouterde, P. S. Raux, C. Clanet, and D. Quéré, Proc. Natl. Acad. Sci. USA 116 (2019).
[3] M. Vuckovac, M. Backholm, J. V. I. Timonen, and R. H. A. Ras, Science Advances 6 (2020).
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