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Related Experiment Video

Updated: Jun 5, 2025

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

Published on: August 18, 2018

Microbubble entrainment on thin liquid films under drop impacts.

H Tran¹, Z He², M Y Pack¹

¹Department of Mechanical Engineering, Baylor University, One Bear Place #97356, Waco, 76798, TX, United States.

Journal of Colloid and Interface Science

|December 10, 2024

Summary

This summary is machine-generated.

Drops impacting liquid films create radial microbubble trains, known as large-area microbubbles (LAMs). This phenomenon is driven by air gaps and contact line instabilities, leading to microbubble coverage.

Keywords:

Drop impact Inclined surface Microbubble Thin film instabilities Wetting

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Last Updated: Jun 5, 2025

Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films

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High Throughput Analysis of Liquid Droplet Impacts

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Published on: March 6, 2020

Area of Science:

Fluid dynamics
Microfluidics
Surface science

Background:

Understanding drop-film interactions is crucial in various industrial processes.
Microbubble formation and behavior in thin films are not fully understood.

Purpose of the Study:

To investigate the formation and characteristics of microbubble trains generated by drop impacts on thin liquid films.
To identify the key physical mechanisms driving microbubble entrainment and coverage.

Main Methods:

Utilizing high-speed imaging to quantify microbubble trains (large-area microbubbles, LAMs) in a thin viscous oil film.
Systematically varying drop impact velocities and surface inclinations.
Analyzing the influence of drop inertia, visco-capillary dynamics, and fluid instabilities.

Main Results:

Radial microbubble trains (LAMs) form over a region comparable to the spreading phase's maximal surface coverage.
Microbubble entrainment is dependent on wetting dynamics and the presence of an air gap.
Rayleigh instability of air tubes leads to radial and azimuthal microbubble coverage.

Conclusions:

Drop impacts on thin liquid films can generate extensive microbubble patterns (LAMs).
The formation of LAMs is governed by air gap dynamics and contact line instabilities.
Wetting phenomena are critical for initiating and sustaining microbubble entrainment.