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Droplet Splashing on an Inclined Surface
Jiguang Hao1, Jie Lu1, Liaonan Lee1
1School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China.
Physical Review Letters
|March 2, 2019
Summary
Droplet splash during oblique impacts can be prevented by increasing surface inclination or reducing ambient pressure. The lamella tip velocity was identified as the key factor determining splash onset conditions.
Area of Science:
- Fluid Dynamics
- Surface Science
- Physics of Droplets
Background:
- Droplet impact dynamics are crucial in various scientific and industrial applications.
- Understanding splash suppression is essential for controlling phenomena like inkjet printing and spray cooling.
- Previous models often simplified the complex interplay of impact velocity, surface angle, and ambient conditions.
Purpose of the Study:
- To investigate the conditions under which droplet splash can be suppressed during oblique impacts.
- To determine the influence of surface inclination angle and ambient gas pressure on splash suppression.
- To develop and validate a modified splash model for predicting splash threshold conditions.
Main Methods:
- High-speed photography was employed to capture oblique droplet impacts.
- Experiments were conducted across a range of inclination angles and ambient gas pressures.
- A theoretical splash model was modified and compared against experimental data.
Main Results:
- Splash suppression was achieved by increasing the inclination angle or decreasing ambient pressure.
- Threshold conditions (angle and pressure) for splash suppression were mapped as functions of impact velocity.
- The modified splash model accurately predicted experimental splash threshold conditions.
Conclusions:
- The velocity of the lamella tip is the critical parameter governing the onset of droplet splash.
- The study provides a validated framework for controlling droplet splash in oblique impact scenarios.
- Findings offer insights into optimizing processes involving droplet deposition and atomization.
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