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Related Experiment Video

Updated: Jul 7, 2026

High Throughput Analysis of Liquid Droplet Impacts

High Throughput Analysis of Liquid Droplet Impacts

Published on: March 6, 2020

Lifetime of a bouncing droplet.

D Terwagne¹, N Vandewalle, S Dorbolo

¹GRASP-Photopôle, Physics Department B5, University of Liège, B-4000 Liège, Belgium.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|February 1, 2008

Summary

Droplet bouncing on liquid surfaces can be prolonged by air injection. Increased acceleration shortens droplet lifetime, linked to thinner air films and phase shifts between droplet shape and motion.

Area of Science:

Fluid dynamics
Surface science
Physics of interfaces

Background:

Droplet behavior on liquid surfaces involves a brief resting period before coalescence.
Air injection can delay or prevent droplet coalescence.
Vertical oscillations of the liquid surface cause droplets to bounce.

Purpose of the Study:

Investigate droplet lifetime on oscillating liquid surfaces.
Analyze the effect of excitation amplitude and frequency on droplet lifetime.
Examine the relationship between air film thickness, droplet deformation, and motion.

Main Methods:

Studied droplet lifetime in relation to excitation amplitude and frequency.
Measured air film thickness using interference fringes.

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Recorded droplet shape evolution and center of mass motion.

Illuminated the system with low-pressure sodium lamps.

Main Results:

Droplet lifetime decreases as acceleration increases.
A shorter lifetime correlates with a thinner air film.
A significant phase offset between droplet deformation and center of mass trajectory was observed.
The phase offset is larger for shorter droplet lifetimes.

Conclusions:

Droplet bouncing dynamics are influenced by excitation parameters.
Air film thickness and phase offset are critical factors determining droplet lifetime.
Understanding these parameters is key to controlling droplet coalescence.