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Drop ejection from vibrating damped, dampened wings
M D Erfanul Alam1, Jeffrey L Kauffman1, Andrew K Dickerson1
1Department of Mechanical and Aerospace Engineering, University of Central Florida, USA. dickerson@ucf.edu.
Soft Matter
|January 30, 2020
Summary
This study investigates how small liquid drops behave on vibrating surfaces. Researchers found that the way a drop detaches depends on the surface
Area of Science:
- Fluid mechanics
- Solid mechanics
- Microfluidics
Background:
- Moisture removal from small surfaces like sensors is difficult.
- External influence is often needed for deposition removal at micro-scales.
Purpose of the Study:
- To explore highly-coupled fluid-solid mechanics for self-sufficient moisture removal.
- To investigate drop release dynamics on vibrating micro-cantilevers.
Main Methods:
- Using millimetric cantilevers as wing-inspired structures.
- Displacing cantilevers sinusoidally at 85-115 Hz to induce high accelerations.
- Observing drop release modes (sliding, ejection, pinch-off) for water and glycerin drops.
Main Results:
- Identified three principal drop release modes: sliding, normal-to-cantilever ejection, and drop pinch-off.
- Release modes are dependent on drop properties, cantilever properties, and cantilever motion.
- Successfully predicted ejection modes using Euler elastica theory and drop adhesion forces.
- Quantified the damping effect of sloshing drops on cantilever motion.
Conclusions:
- Demonstrated a method for self-sufficient drop removal from micro-surfaces.
- Provided a predictive model for drop release behavior based on fluid-solid interactions.
- Highlighted the significant impact of fluid-structure interaction on micro-scale dynamics.
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