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Dynamics of initial drop splashing on a dry smooth surface.
Zhenlong Wu1,2, Yihua Cao2
1National Laboratory of Aeronautics and Astronautics, Beihang University, Beijing, China.
Plos One
|May 12, 2017
Summary
The earliest liquid drop splashing on a surface is simulated. Splash onset depends mainly on impact speed and drop size, not viscosity or surface tension.
Area of Science:
- Fluid dynamics
- Surface science
- Impact mechanics
Background:
- Understanding liquid drop impact is crucial in various fields, including printing and agriculture.
- Previous studies have focused on larger drops or different surface conditions.
Purpose of the Study:
- To simulate and analyze the initial splashing of a cylindrical liquid drop on a dry surface.
- To identify key parameters influencing splash onset and evolution.
Main Methods:
- Numerical simulations of fluid dynamics.
- Analysis of droplet ejection and spreading dynamics.
Main Results:
- A tiny splash is observed early in the impact process.
- Splash onset time is primarily governed by impact velocity and drop radius.
- Three distinct splashing regimes were identified based on droplet ejection patterns.
- Outermost droplets exhibit uniform radial expansion proportional to impact speed.
Conclusions:
- The study elucidates the mechanism behind initial drop splashing.
- Impact velocity and drop radius are critical factors determining splash characteristics.
- The findings provide insights into droplet behavior in impact scenarios.
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