Regensburg 2022 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.36: Poster
Monday, September 5, 2022, 18:00–20:00, P1
Transport of thin water films: from thermally activated random walks to hydrodynamics — Simon Gravelle1, Christian Holm1, and •Alexander Schlaich2 — 1Institute for Computational Physics, University of Stuttgart, Germany — 2Stuttgart Center for Simulation Science (SC SimTech), University of Stuttgart, Germany
Under ambient atmospheric conditions, a thin film of water wets many solid surfaces, including insulators, ice, and salt. The film thickness as well as its transport behavior sensitively depend on the surrounding humidity. Understanding this intricate interplay is of highest relevance for water transport through porous media, particularly in the context of soil salinization induced by evaporation. Here, we use molecular simulations to evaluate the transport properties of thin water films on prototypical salt and soil interfaces.
Our results show two distinct regimes for water transport: at low water coverage, the film permeance scales linearly with the adsorbed amount, in agreement with the activated random walk model. Finally, in the context of water transport through porous material, we determine the humidity-dependent crossover between a vapor dominated and a thin film dominated transport regimes depending on the pore size.