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Singular jets during droplet impact on superhydrophobic surfaces
Xiaoyun Peng1, Tianyou Wang2, Feifei Jia1
1State Key Laboratory of Engines, Tianjin University, Tianjin, 300350, China.
Journal of Colloid and Interface Science
|August 13, 2023
Summary
Researchers discovered a new type of singular jet during droplet impacts on super-hydrophobic surfaces, driven by horizontal inertia, distinct from capillary deformation-induced jets. This finding advances understanding of liquid dispersal and transport dynamics.
Area of Science:
- Fluid dynamics
- Surface science
- Microfluidics
Background:
- Droplet impact is crucial in many applications, influencing liquid dispersal and transport.
- Jetting during droplet impact on super-hydrophobic surfaces exhibits unique phenomena and mechanisms.
Purpose of the Study:
- To investigate new jetting dynamics during droplet impact on super-hydrophobic surfaces.
- To identify novel jetting phenomena, mechanisms, and regimes under varied impact conditions.
Main Methods:
- Experimental study of droplet impact on super-hydrophobic surfaces.
- Systematic variation of Weber and Ohnesorge numbers.
- Theoretical analysis of the impact process.
Main Results:
- Identification of horizontal inertia (HI) singular jets, distinct from capillary deformation (CD) singular jets.
- Quantitative analysis of droplet spreading, spire formation/collapse, and cavity dynamics.
- Development of a regime map for singular jet formation and analysis of transition conditions.
Conclusions:
- Horizontal inertia is a key factor in singular jet formation during droplet impact on super-hydrophobic surfaces.
- The study provides a comprehensive understanding of jetting dynamics and regimes.
- New scaling relationships offer predictive capabilities for droplet impact phenomena.
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