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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

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Bubble formation on a submerged micronozzle.

Saeid Vafaei¹, Dongsheng Wen

¹School of Engineering and Materials Science, Queen Mary University of London, London, UK.

Journal of Colloid and Interface Science

|December 30, 2009

Summary

This study details air bubble formation on a small nozzle, finding bubble characteristics are mostly flow rate independent. The Young-Laplace equation accurately predicts bubble growth until detachment, influenced by surface tension, buoyancy, and gravity.

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Published on: January 10, 2017

Area of Science:

Fluid Dynamics
Microfluidics
Surface Science

Background:

Understanding bubble formation is crucial in various industrial and scientific applications.
Previous studies have often focused on larger scales or different conditions.

Purpose of the Study:

To investigate the detailed formation dynamics of air bubbles on a submerged micrometer-sized nozzle.
To analyze the influence of gas flow rate on bubble characteristics.
To validate the predictive capability of the Young-Laplace equation for bubble evolution.

Main Methods:

Experimental investigation using a submerged micrometer-sized nozzle (55 microm radius).
Controlled low gas flow rates (0.015-0.83 ml/min).
High-speed optical camera for recording bubble formation and measuring contact angles, heights, and contact line radii.

Main Results:

Bubble formation characteristics showed weak dependence on flow rate under tested conditions.
The Young-Laplace equation accurately predicted bubble evolution up to the point of detachment.
Variations in bubble characteristics were linked to the interplay of surface tension, buoyancy, and gravitational forces.

Conclusions:

Bubble formation on micrometer nozzles is primarily governed by fluid forces rather than flow rate variations.
The Young-Laplace equation provides a reliable model for bubble growth prediction in this regime.
Surface tension, buoyancy, and gravity are key factors influencing bubble dynamics during formation and detachment.