Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 5: Wetting, Droplets and Microfluidics (joint session DY/CPP)
CPP 5.2: Talk
Monday, September 5, 2022, 10:15–10:30, H19
Wetting dynamics of droplets: an immersed boundary lattice Boltzmann approach — •Francesca Pelusi1, Othmane Aouane1, Fabio Guglietta1, Marcello Sega1, and Jens Harting1,2 — 1Helmholtz Institute Erlangen-Nürnberg, Germany — 2Department of Chemical and Biological Engineering and Department of Physics, FAU, Germany
Many applications in computational fluid dynamics require the immersed boundary (IB) method to couple the dynamics of well-defined structures with that of a surrounding fluid. If the latter is simulated with a lattice Boltzmann (LB) method, the resulting IBLB approach is known to be a very versatile tool, for example, in studying dense suspensions of red blood cells. However, little attention has been devoted so far to applying this approach to substrate wetting problems. Here, we report on an IBLB-based investigation of the wetting of droplets interacting with a solid surface. In our model, the droplet surface tension contributes to the force the droplet (structure) communicates to the surrounding fluid. We characterize Newtonian droplets’ static and dynamic contact angles and show how surface/IB-nodes interaction tuning allows obtaining the desired wetting properties. Furthermore, the flexibility of the IBLB approach will enable us to model non-Newtonian surface rheology, opening the possibility of simulating the unusual wetting behavior of gallium droplets. Indeed, liquid gallium develops an oxide layer at the liquid surface when in contact with the oxygen, which affects its adhesive properties with significant consequences for its high-tech applications, such as catalysis.