Droplet impact on doubly re-entrant structures

Doubly re-entrant pillars have been demonstrated to possess superior static and dynamic liquid repellency against highly wettable liquids compared to straight or re-entrant pillars. Nevertheless, there has been little insight into how the key structural parameters of doubly re-entrant pillars influe...

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Bibliographic Details
Published in:Scientific reports 2024-02, Vol.14 (1), p.2700-2700, Article 2700
Main Authors: Singh, Navdeep Sangeet, Jitniyom, Thanaphun, Navarro-Cía, Miguel, Gao, Nan
Format: Article
Language:English
Subjects:
639/166/988
639/766/119/544
639/766/189
Contact angle
Humanities and Social Sciences
Hydrodynamics
Hydrophobic surfaces
multidisciplinary
Multiphase flow
Repellency
Science
Science (multidisciplinary)
Simulation
Velocity
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Summary:Doubly re-entrant pillars have been demonstrated to possess superior static and dynamic liquid repellency against highly wettable liquids compared to straight or re-entrant pillars. Nevertheless, there has been little insight into how the key structural parameters of doubly re-entrant pillars influence the hydrodynamics of impacting droplets. In this work, we carried out numerical simulations and experimental studies to portray the fundamental physical phenomena that can explain the alteration of the surface wettability from adjusting the design parameters of the doubly re-entrant pillars. On the one hand, three-dimensional multiphase flow simulations of droplet impact were conducted to probe the predominance of the overhang structure in dynamic liquid repellency. On the other hand, the numerical results of droplet impact behaviours are agreed by the experimental results for different pitch sizes and contact angles. Furthermore, the dimensions of the doubly re-entrant pillars, including the height, diameter, overhang length and overhang thickness, were altered to establish their effect on droplet repellency. These findings present the opportunity for manipulations of droplet behaviours by means of improving the critical dimensional parameters of doubly re-entrant structures.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-024-52951-2