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Evaporation-Triggered Segregation of Sessile Binary Droplets
Yaxing Li1, Pengyu Lv1, Christian Diddens1,2
1Physics of Fluids group, Max-Planck Center Twente for Complex Fluid Dynamics, Department of Science and Technology, Mesa+ Institute, and J. M. Burgers Centre for Fluid Dynamics, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands.
Physical Review Letters
|June 16, 2018
Summary
Phase segregation in evaporating binary droplets, like water and 1,2-hexanediol, slows water evaporation. Nonvolatile 1,2-hexanediol shields water, eventually halting droplet evaporation.
Area of Science:
- Physical Chemistry
- Fluid Dynamics
- Materials Science
Background:
- Droplet evaporation is crucial for applications like inkjet printing and spray cooling.
- Understanding multicomponent droplet behavior is key to optimizing these processes.
Purpose of the Study:
- To investigate the phase segregation phenomenon in evaporating binary droplets.
- To elucidate the mechanisms behind altered evaporation rates and cessation.
Main Methods:
- Experimental observation of sessile binary droplets (water and 1,2-hexanediol).
- Particle image velocimetry (PIV) for flow field visualization.
- Numerical simulations to model droplet dynamics.
Main Results:
- Phase segregation (demixing) was observed in the evaporating droplet.
- Segregation significantly reduced the water evaporation rate.
- The nonvolatile 1,2-hexanediol formed a protective layer, ceasing evaporation.
- Water evaporation timescale at the rim outpaced Marangoni flow, driving segregation.
Conclusions:
- Phase segregation is a critical factor influencing multicomponent droplet evaporation.
- The interplay between evaporation rate and Marangoni flow dictates segregation.
- This phenomenon has implications for controlling evaporation in various applications.
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