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High Throughput Analysis of Liquid Droplet Impacts
Published on: March 6, 2020
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Impact dynamics of particle-coated droplets
T Supakar1, A Kumar1, J O Marston1
1Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409, USA.
Physical Review. E
|February 18, 2017
Summary
Liquid marbles impacting surfaces show particle movement to the edge during spreading. Their maximum spread follows a power-law scaling, with particle presence minimizing surface wettability effects.
Area of Science:
- Fluid dynamics
- Surface science
- Materials science
Background:
- Liquid marbles (LMs) are drops of liquid encapsulated by hydrophobic particles.
- Understanding LM impact dynamics is crucial for applications in microfluidics and material transport.
- Previous studies have not fully detailed the impact dynamics of LMs on solid surfaces.
Purpose of the Study:
- To experimentally investigate the impact dynamics of liquid marbles on solid surfaces.
- To characterize the spreading behavior and identify key parameters influencing it.
- To compare the impact of LMs with pure liquid droplets.
Main Methods:
- Utilized dual-view high-speed imaging to capture impact events.
- Quantified spreading using maximum spread diameter measurements.
- Analyzed energy balance and particle behavior during impact and retraction.
- Measured circularity of arrested shapes for fine particle impacts.
Main Results:
- Observed rapid particle migration to the lamella during the spreading phase.
- Established a power-law scaling for normalized maximum spread (Dmax/D0) with Weber number (We) as Dmax/D0∼We^α, with α≈1/3.
- Found no significant difference in maximum spread between hydrophobic and hydrophilic surfaces due to particle presence.
- Observed formation of nonspherical arrested shapes for fine particles on hydrophobic surfaces.
Conclusions:
- LM impact dynamics are influenced by particle behavior, particularly their migration.
- Energy balance provides a robust model for describing LM spreading.
- The encapsulating particles effectively shield the liquid from the surface, maintaining marble integrity and spreading characteristics across different surface wettabilities.
- Further research into particle size effects can reveal more complex post-impact behaviors.
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