Droplet impact on doubly re-entrant structures
Navdeep Sangeet Singh1, Thanaphun Jitniyom1, Miguel Navarro-Cía1,2
1School of Engineering, University of Birmingham, Birmingham, B15 2TT, UK.
Scientific Reports
|February 1, 2024
Summary
Doubly re-entrant pillars enhance liquid repellency by optimizing structural parameters. This study reveals how pillar dimensions influence droplet impact dynamics for improved surface wettability.
Area of Science:
- Surface science and fluid dynamics.
- Micro/nanostructured surfaces.
- Wettability and liquid-repellent technologies.
Background:
- Doubly re-entrant pillars offer superior liquid repellency compared to simpler designs.
- Understanding the impact of structural parameters on droplet dynamics is crucial for optimizing performance.
- Existing research lacks detailed insight into the hydrodynamics of droplet impact on these structures.
Purpose of the Study:
- To investigate how key structural parameters of doubly re-entrant pillars affect the hydrodynamics of impacting droplets.
- To elucidate the physical phenomena governing surface wettability changes with pillar design.
- To establish the influence of specific dimensions on droplet repellency.
Main Methods:
- Three-dimensional multiphase flow simulations of droplet impact.
- Experimental validation of simulation results.
- Systematic variation of pillar dimensions (height, diameter, overhang length/thickness) and surface parameters (pitch, contact angle).
Main Results:
- The overhang structure plays a predominant role in dynamic liquid repellency.
- Numerical simulations accurately predict droplet impact behavior, validated by experimental data.
- Pillar dimensions significantly influence droplet impact dynamics and overall repellency.
Conclusions:
- Surface wettability can be effectively manipulated by adjusting doubly re-entrant pillar design parameters.
- Optimizing critical dimensional parameters of these structures allows for enhanced droplet behavior control.
- This research provides a foundation for designing advanced liquid-repellent surfaces.
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