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Role of the Dynamic Contact Angle on Splashing
Miguel A Quetzeri-Santiago1, Kensuke Yokoi2, Alfonso A Castrejón-Pita3
1School of Engineering and Materials Science, Queen Mary, University of London, London E1 4NS, United Kingdom.
Physical Review Letters
|July 9, 2019
Summary
Droplet splashing on surfaces depends on wetting properties. Researchers found the maximum dynamic advancing contact angle and splashing ratio, not Capillary number, best predict droplet splash behavior.
Area of Science:
- Fluid dynamics
- Surface science
- Wettability studies
Background:
- Droplet impact dynamics are crucial in various applications.
- Surface wetting properties significantly influence droplet behavior.
- Existing parameters like Capillary number may not fully capture splashing.
Purpose of the Study:
- To investigate droplet splashing on surfaces with varying wettability.
- To determine the key parameters governing droplet splash.
- To evaluate the effectiveness of dynamic contact angle in predicting splash.
Main Methods:
- Experimental study of droplet impact.
- Utilizing high-speed imaging and image analysis.
- Measuring apparent contact angle and spreading speed.
Main Results:
- Splashing behavior varies with substrate wettability (hydrophilic to superhydrophobic).
- Capillary number and splashing parameter are insufficient for characterization.
- Maximum dynamic advancing contact angle and splashing ratio (β) are effective predictors.
Conclusions:
- Dynamic contact angle is a critical factor in droplet splashing.
- Maximum dynamic advancing contact angle and splashing ratio (β) provide robust characterization of droplet splash.
- New parameters offer improved understanding of droplet-surface interactions.
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