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Coalescence-induced droplet detachment on low-adhesion surfaces: A three-phase system study
Mostafa Moradi1, Mohammad Hassan Rahimian1, Seyed Farshid Chini1
1School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran.
Physical Review. E
|July 24, 2019
Summary
Water droplets can spontaneously jump off superhydrophobic surfaces after merging. This self-propelled droplet jumping is influenced by lubricant-water interfacial tension and surface wettability, crucial for applications like heat transfer and self-cleaning.
Area of Science:
- Fluid dynamics
- Surface science
- Materials science
Background:
- Coalescing water droplets on superhydrophobic surfaces exhibit self-propelled detachment.
- This phenomenon is vital for applications including phase change heat transfer, self-cleaning, and anti-icing/anti-dew coatings.
Purpose of the Study:
- To numerically investigate coalescence-induced droplet jumping in a three-phase system.
- To explore the influence of lubricant properties and surface wettability on droplet detachment.
Main Methods:
- Utilized a mass-conserving lattice Boltzmann method for numerical simulations.
- Investigated the effects of interfacial tensions, droplet size, and surface wettability.
Main Results:
- Droplet detachment occurs at high lubricant-water interfacial tensions and large surface-water contact angles (>150°).
- The critical droplet size for jumping is significantly dependent on lubricant-water interfacial properties.
Conclusions:
- Provides insights into fluid-fluid and fluid-solid interactions during droplet coalescence.
- Elucidates the underlying mechanisms of droplet jumping on superhydrophobic surfaces with lubricant-filled gaps.
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