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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 52: Wetting, Fluidics and Liquids at Interfaces and Surfaces III (joint session CPP/DY)

CPP 52.2: Vortrag

Donnerstag, 30. März 2023, 15:15–15:30, MER 02

Surface tension of cavitation bubbles — •Marine Bossert¹, Panayotis Spathis², Pierre-Étienne Wolf², Laurent Cagnon², Isabelle Trimaille³, and Étienne Rolley⁴ — ¹Institut of Materials Physics and Technology, Hamburg University of Technology, Germany — ²Institut Néel, Grenoble, France — ³Institut des NanoSciences de Paris, Paris, France — ⁴Laboratoire de Physique de l'Ècole Normale Supérieure, Paris, France

The evaporation of a fluid contained in a porous material occurs by cavitation when the pores are connected to the outer gas reservoir through small constrictions. Using monolithic transparent porous samples, we have measured the cavitation rate J as a function of the departure from equilibrium for hexane at room temperature [1] and nitrogen over a wide temperature range.

When the radius of the critical nucleus R* is large, our measurements are in agreement with the prediction of the Classical Nucleation Theory. However, when the thickness of the interface is not negligible compared to R*, we find that J is much larger than predicted. We show that this shift can be accounted for if the liquid-vapor surface tension is allowed to depend on the interface curvature. This dependence is in reasonable agreement with Density Functional calculations for Lennard-Jones fluid, including the correction to second order in curvature.

[1] V. Doebele, et al, Phys. Rev. Lett. 125 (2020) 255701.