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 www.zoom.us, Meeting ID: 980 3913 9623, Passcode: 050762
- Gastgeber: MPIDS/DCF
- Kontakt: oliver.baeumchen@ds.mpg.de
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).
[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).