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Wetting transition energy curves for a droplet on a square-post patterned surface

Gong, Wei; Zu, Yingqing; Chen, Sheng; Yan, Yuying

Authors

Wei Gong

Yingqing Zu

Sheng Chen

YUYING YAN YUYING.YAN@NOTTINGHAM.AC.UK
Professor of Thermofluids Engineering_*d



Abstract

Due to the property of water repellence, biomimetic superhydrophobic surfaces have been widely applied to green technologies, in turn inducing wider and deeper investigations on superhydrophobic surfaces. Theoretical, experimental and numerical studies on wetting transitions have been carried out by researchers, but the mechanism of wetting transitions between Cassie-Baxter state and Wenzel state, which is crucial to develop a stable superhydrophobic surface, is still not fully understood. In this paper, the free energy curves based on the transition processes are presented and discussed in detail. The existence of energy barriers with or without consideration of the gravity effect, and the irreversibility of wetting transition are discussed based on the presented energy curves. The energy curves show that different routes of the Cassie-to-Wenzel transition and the reverse transition are the main reason for the irreversibility. Numerical simulations are implemented via a phase field lattice Boltzmann method of large density ratio, and the simulation results show good consistency with the theoretical analysis.

Citation

Gong, W., Zu, Y., Chen, S., & Yan, Y. (2017). Wetting transition energy curves for a droplet on a square-post patterned surface. Science Bulletin, 62(2), https://doi.org/10.1016/j.scib.2016.12.003

Journal Article Type Article
Acceptance Date Nov 28, 2016
Online Publication Date Dec 14, 2016
Publication Date Jan 30, 2017
Deposit Date Feb 28, 2017
Publicly Available Date Feb 28, 2017
Journal Science Bulletin
Electronic ISSN 2095-9273
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 62
Issue 2
DOI https://doi.org/10.1016/j.scib.2016.12.003
Keywords Wetting transition; Energy curves; Lattice Boltzmann method
Public URL http://eprints.nottingham.ac.uk/id/eprint/40908
Publisher URL http://www.sciencedirect.com/science/article/pii/S2095927316305874
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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