Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Wetting, Fluidics and Liquids at Interfaces and Surfaces II (joint session CPP/DY)

CPP 14.2: Vortrag

Montag, 17. März 2025, 17:45–18:00, H34

Gradient dynamics model for volatile binary mixtures including Marangoni flows — •Jan Diekmann und Uwe Thiele — Universität Münster, Wilhelm-Klemm-Straße 9, 48149 Münster

We present a mesoscopic thin-film model in gradient dynamics form for binary liquid mixtures on solid substrates incorporating interface tension-induced flow, and volatility in a narrow gap. Thereby, we use and expand models established in [1-4] by accounting for the two substances in each of two bulk phases - liquid and gas - and for the enrichment of one component at the liquid-gas interface. We discuss the different contributions to the free energy, thereby employing Flory-Huggins theory of mixing for the condensed phase and assuming ideal gases for the vapor phase. The resulting five-field model is then analyzed with numerical time simulations focusing on the interplay of the drop dynamics with the developing lateral concentration gradients, and the resulting Marangoni flows. The results are compared to experimental findings [5].

[1] Thiele et al. Physical Review Fluids, 2016. doi: 10.1103/physrevfluids.1.083903.

[2] Xu et al. Journal of Physics: Condensed Matter, 2015. doi:10.1088/0953-8984/27/8/085005.

[3] Hartmann et al. Langmuir, 2024. doi: 10.1021/acs.langmuir.3c03313.

[4] Thiele et al. Physical Review Letters, 2013. doi: 10.1103/physrevlett.111.117801.

[5] Chao et al. Proceedings of the National Academy of Sciences, 2022. doi: 10.1073/pnas.2203510119.

Keywords: wetting; interfaces