Multiscale perspective on wetting on switchable substrates: Mapping between microscopic and mesoscopic models

Moritz Stieneker, Leon Topp, Svetlana V. Gurevich, and Andreas Heuer

Phys. Rev. Fluids 8, 013902 – Published 18 January 2023

Abstract

To understand the nonequilibrium relaxation dynamics of a liquid droplet on a switchable substrate, the interplay of different length and timescales needs to be understood. We present a method to map the microscopic information from a molecular-dynamics simulation to a mesoscopic scale, reflected by a thin-film model. After a discussion of the mapping procedure, we first analyze the relaxation of a liquid droplet upon switching the wettability of the substrate. Furthermore, we show that a nearly identical mapping procedure can be used to describe two coalescing droplets. With our procedure we take a first step to extend the mapping from the equilibrium case to nonequilibrium wetting dynamics, thus allowing for quantitative multiscale analysis.

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Received 25 November 2021
Accepted 15 December 2022

DOI:https://doi.org/10.1103/PhysRevFluids.8.013902

Physics Subject Headings (PhySH)

Contact line dynamics Drop coalescence Drop interactions Fluid-particle interactions Instability control Thin fluid films Wetting

Fluid DynamicsCondensed Matter, Materials & Applied PhysicsNonlinear Dynamics

Authors & Affiliations

Moritz Stieneker ^1,2,*, Leon Topp ^3,*, Svetlana V. Gurevich ^1,2,4,†, and Andreas Heuer ^3,2,4,‡

¹University of Münster, Institute for Theoretical Physics, Wilhelm-Klemm-Str. 9, 48149 Münster, Germany
²University of Münster, Center of Nonlinear Science (CeNoS), Corrensstr. 2, 48149 Münster, Germany
³University of Münster, Institute for Physical Chemistry, Corrensstr. 28/30, 48149 Münster, Germany
⁴University of Münster, Center for Multiscale Theory and Computation (CMTC), Corrensstr. 40, 48149 Münster, Germany

^*These authors contributed equally to this work.
^†gurevics@uni-muenster.de
^‡andheuer@uni-muenster.de

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Issue

Vol. 8, Iss. 1 — January 2023

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