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Updated: Feb 9, 2026
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Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
Published on: August 15, 2018
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Tunable Droplet Breakup Dynamics on Micropillared Superhydrophobic Surfaces
Rui Zhang1,2, Pengfei Hao1,2, Xiwen Zhang1,2
1Department of Engineering Mechanics , Tsinghua University , Beijing 100084 , China.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 12, 2018
Summary
Superhydrophobic surfaces with micropillars control droplet splitting for applications like anti-icing. Pillar geometry dictates whether droplet breakup is facilitated or suppressed, revealing new breakup mechanisms.
Area of Science:
- Materials Science
- Fluid Dynamics
- Surface Science
Background:
- Functional materials with controllable droplet breakup are crucial for aircraft anti-icing, spray cooling, and surface coating.
- Understanding droplet splitting dynamics on engineered surfaces is key to optimizing these applications.
Purpose of the Study:
- To investigate how micropillar arrays on superhydrophobic surfaces influence droplet splitting.
- To determine the role of micropillar geometry (spacing and height) in controlling droplet breakup patterns.
Main Methods:
- Fabrication of superhydrophobic surfaces with varied micropillar arrays.
- Experimental observation and analysis of droplet impact and breakup dynamics.
- Quantitative analysis of geometric parameters affecting droplet breakup criteria.
Main Results:
- Micropillar arrays can either facilitate or suppress droplet splitting based on their morphology.
- Dense pillars delay splashing by supporting the liquid lamella and enabling air escape.
- Sparse tall pillars introduce a novel breakup mechanism via lateral liquid jet instability, lowering the breakup threshold.
Conclusions:
- Ordered microstructures significantly impact droplet breakup dynamics.
- The critical Weber number for low-viscous liquid rupture is tunable via micropillar and droplet geometry.
- This research provides a quantitative framework for revising droplet breakup criteria using engineered surfaces.
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