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The role of oscillation in ellipsoidal drop impact on a solid surface
1Department of Mechanical Engineering, Korea National University of Transportation, Chungju 27469, Republic of Korea.
Journal of Colloid and Interface Science
|August 3, 2021
Summary
Oscillating ellipsoidal drops impact surfaces differently than spherical drops. Their shape and oscillation phase significantly alter rebound dynamics and spreading, offering new insights into fluid mechanics.
Area of Science:
- Fluid Dynamics
- Surface Science
- Non-Newtonian Fluids
Background:
- Ellipsoidal drop impact dynamics differ from spherical drops, influencing rebound.
- Previous studies overlooked the impact of drop oscillation on post-impact dynamics.
Purpose of the Study:
- Investigate the impact dynamics of oscillating ellipsoidal drops.
- Analyze the influence of ellipticity, oscillation phase, and Weber number (We).
Main Methods:
- Experimental analysis of drop impact.
- Numerical simulations of fluid dynamics.
- Characterization of spreading dynamics and momentum distribution.
Main Results:
- Observed notable hysteresis in maximal spreading diameters across oscillation phases.
- Prolate drops exhibited more prominent hysteresis than oblate drops.
- Increased Weber number suppressed hysteresis and altered momentum asymmetry.
Conclusions:
- Drop oscillation phase and ellipticity critically influence hydrodynamics during impact.
- Momentum asymmetry in horizontal axes affects rebound magnitude.
- Findings offer novel insights into drop impact phenomena on non-wetting surfaces.
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