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Phase-field simulations of droplet impact on superhydrophobic surfaces
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Xia, Lei, Chen, Faze, Liu, Teng, Zhang, Du, Tian, Yanling and Zhang, Dawei (2023) Phase-field simulations of droplet impact on superhydrophobic surfaces. International Journal of Mechanical Sciences, 240 . 107957. doi:10.1016/j.ijmecsci.2022.107957 ISSN 00207403.
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Official URL: https://doi.org/10.1016/j.ijmecsci.2022.107957
Abstract
Although the impingement of droplets on superhydrophobic surfaces has been extensively studied, the critical role of the air is typically ignored, leading to some paradoxical conclusions. In this paper, a phase-field model with dynamic contact angles is implemented to simulate the impingement of droplets on a superhydrophobic surface. The simulation results agree well with the experimental data. The droplet's impact on the surface is observed and divided into four categories: contactless bouncing, wet bouncing, dry-out bouncing and non-bouncing. The role of air was emphasised by analysing pressure distribution and velocity field corresponding to the droplet evolution, revealing the mechanism behind the droplet impact. A non-monotonically varying trend of the non-dimensional maximum wetting diameter is observed by increasing Ohnesorge number (Oh). The value of dimensionless viscous extension first increased and then decreased with increasing impact number, and this counter-intuitively outcome has not been reported previously. Non-dimensional contact time of a bouncing droplet decreases rapidly with increasing Weber number (We), but approaches a plateau value if We is greater than 1. Additionally, for liquids with different viscosities, the non-dimensional contact time of bouncing droplets is independent of Oh. Moreover, regime maps of the dynamic behaviours of a droplet impact are developed to present an intuitive interpretation of different droplet fates.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Journal or Publication Title: | International Journal of Mechanical Sciences | ||||||||
Publisher: | Elsevier | ||||||||
ISSN: | 00207403 | ||||||||
Official Date: | 15 February 2023 | ||||||||
Dates: |
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Volume: | 240 | ||||||||
Article Number: | 107957 | ||||||||
DOI: | 10.1016/j.ijmecsci.2022.107957 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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