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Bubble splitting in oscillatory flows on ground and in reduced gravity.

H N Yoshikawa¹, F Zoueshtiagh, H Caps

¹Physique et Mécanique des Milieux Hétérogène - UMR 7636, 10 rue Vauquelin, 75231, Paris Cedex 05, France. harunori@unice.fr

The European Physical Journal. E, Soft Matter

|March 3, 2010

Summary

Strong accelerations cause centimeter-scale air bubbles to break up in liquids, regardless of gravity. Researchers identified a critical acceleration for breakup and proposed an inertial mechanism consistent with experimental data.

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Area of Science:

Fluid dynamics
Bubble dynamics
Multiphase flow

Background:

Understanding bubble stability is crucial in various industrial and natural processes.
Previous studies on bubble breakup have primarily focused on single-phase flows or different acceleration regimes.

Purpose of the Study:

To investigate the stability of centimeter-scale air bubbles in a quiescent liquid under oscillatory acceleration.
To determine the critical acceleration for bubble breakup in both normal and reduced gravity.
To explore the influence of liquid viscosity and gravity on bubble breakup mechanisms.

Main Methods:

Experiments conducted in reduced- and normal-gravity environments.
Imposed oscillatory acceleration field to induce bubble instability.
Observation and analysis of bubble breakup onset and characteristics.

Main Results:

A strong oscillatory acceleration causes bubble instability and breakup in both gravity environments.
Bubble breakup onset is characterized by a critical acceleration (a_cr).
Empirical correlations for breakup onset were developed, showing consistency with an inertial breakup mechanism.

Conclusions:

The inertial mechanism provides a consistent explanation for bubble breakup under oscillatory acceleration.
A breakup criterion based on an energetic approach is proposed for both gravitational environments.
Findings contribute to a better understanding of bubble dynamics in varying gravitational conditions.