Controlling the dewetting morphologies of thin liquid films by switchable substrates
Zitz S, Scagliarini A, Harting J (2023)
Publication Type: Journal article
Publication year: 2023
Journal
Book Volume: 8
Article Number: L122001
Journal Issue: 12
DOI: 10.1103/PhysRevFluids.8.L122001
Abstract
Switchable and adaptive substrates emerged as valuable tools for controlling wetting and actuation of droplet motion. Here, we report a computational study of the dynamics of an unstable thin liquid film deposited on a switchable substrate, modeled with a space- and time-varying contact angle. For a sufficiently large rate of wettability variation, a topological transition appears. Instead of breaking up into droplets, as expected for a substrate with multiple wetting minima, a metastable rivulet state emerges. A criterion discriminating whether or not rivulets occur is identified in terms of a single dimensionless parameter. Finally, we show and derive theoretically how the film rupture times, droplet shape, and rivulet lifetime depend on the pattern wavelength and speed.
Involved external institutions
Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Germany (DE)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
Germany (DE)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
How to cite
APA:
Zitz, S., Scagliarini, A., & Harting, J. (2023). Controlling the dewetting morphologies of thin liquid films by switchable substrates. Physical Review Fluids, 8(12). https://doi.org/10.1103/PhysRevFluids.8.L122001
MLA:
Zitz, S., A. Scagliarini, and J. Harting. "Controlling the dewetting morphologies of thin liquid films by switchable substrates." Physical Review Fluids 8.12 (2023).
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