Seminario del 2024

Giugno
dal giorno
06/06/2024
al giorno
07/06/2024
Riccardo Durastanti
Spreading phenomena under singular potentials: statics and dynamics
Seminario di analisi matematica
We look at spreading phenomena under the action of singular potentials modeling repulsion between the liquidgas interface and the substrate. We mainly discuss the static case: depending on the form of the potential, the macroscopic profile of equilibrium configurations can be either droplet-like or pancake-like, with a transition profile between the two at zero spreading coefficient. These results generalize, complete, and give mathematical rigor to de Gennes’ formal discussion of spreading equilibria. Uniqueness and non-uniqueness phenomena are also discussed. Then we will briefly focus on the dynamics, assuming zero slippage at the contact line. Based on formal analysis arguments, we report that generic travelling-wave solutions exist and have finite rate of dissipation, indicating that singular potentials stand as an alternative solution to the contact-line paradox. In agreement with equilibrium configurations, travelling-wave solutions have microscopic contact angle equal to π/2 and, for mild singularities, finite energy. This is a joint work with Lorenzo Giacomelli.

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