Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 97: Wetting and Liquids at Interfaces and Surfaces I (joint session CPP/DY/O)

O 97.12: Vortrag

Donnerstag, 19. März 2020, 12:30–12:45, ZEU 255

Impact of submillimetre-sized droplets on freely suspended liquid membranes — •Florian von Rüling, Alexey Eremin, and Ralf Stannarius — Otto von Guericke University Magdeburg, Germany

Droplet impact and splashing phenomena at solid and fluid interfaces remain an exciting research topic with vast application possibilities [1]. Impact scenarios are primarily governed by capillary forces, inertia, oscillation dynamics of the droplets, and the dynamics of the thin air cushion entrapped between droplet and surface during impact [2,3]. We experimentally investigated the impact of large submillimetre- to millimetre-sized droplets on freely suspended smectic films. We were able to vary the droplet diameter from several hundred microns to one millimetre. Droplets can either be trapped or reflected by the film or tunnel through it, depending on geometrical and dynamical parameters. The film remains intact in all these scenarios. In addition to the drop size and impact velocity, material properties and the film thickness can affect the behaviour of both droplet and film.

[1] A. M. Worthington, The Splash of a Drop; Romance of Science. Society for the Promotion of Christian Knowledge, London, 1895.

[2] C. Antonini, A. Amirfazli, M. Marengo, Drop impact and wettability: From hydrophilic to superhydrophobic surfaces, Phys. Fluids 24 102104 (2012).

[3] S. Dölle, R. Stannarius, Microdroplets impinging on freely suspended smectic films: three impact regimes, Langmuir 31 6479 (2015).

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