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High Throughput Analysis of Liquid Droplet Impacts
Published on: March 6, 2020
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Complex Drop Impact Morphology
Viktor Grishaev1, Carlo Saverio Iorio1, Frank Dubois1
1Service de Chimie-Physique EP, Université Libre de Bruxelles , 50 Av. F.D. Roosevelt 1050, Brussels CP165-62, Belgium.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 15, 2015
Summary
Adding particles to impacting drops changes their behavior, suppressing jetting but promoting splashing and rupture. Increased particle volume fraction linearly decreases spreading due to energy dissipation.
Area of Science:
- Fluid Dynamics
- Materials Science
Background:
- Understanding drop impact is crucial for various industrial applications.
- Particle-laden drops exhibit complex behaviors distinct from pure liquid drops.
Purpose of the Study:
- Investigate the influence of particle inclusions on drop impact dynamics.
- Characterize changes in phenomena like splashing, rebound, and spreading.
Main Methods:
- Impact experiments using millimeter-size water drops with embedded hydrophobic particles (200 and 500 μm).
- Utilized hydrophilic (glass) and hydrophobic (polycarbonate) substrates.
- Analyzed impact using high-speed side and bottom view imaging across specified Weber (We) and Reynolds (Re) numbers.
Main Results:
- Particles suppressed singular jetting and partial rebound.
- Observed promotion of splashing, receding breakup, and rupture.
- Two-phase spreading (inertial and capillary) noted for drops with 200 μm particles.
- Increased volume fraction of 200 μm particles led to a linear decrease in maximum spreading factor.
- Energy dissipation via friction between particles and substrate explained the spreading reduction.
Conclusions:
- Particle inclusions significantly alter drop impact outcomes.
- Hydrophobic particles modify surface interactions, influencing spreading and breakup modes.
- Frictional energy dissipation plays a key role in the dynamics of particle-laden drop impacts.
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