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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

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Recirculation model for liquid flow in foam channels.

O Pitois¹, N Louvet, F Rouyer

¹Laboratoire de Physique des Matériaux Divisés et des Interfaces, Université Paris-Est, UMR CNRS 8108, 5 bvd Descartes, 77454 Marne la Vallée Cedex 2, France. olivier.pitois@univ-mlv.fr

The European Physical Journal. E, Soft Matter

|September 17, 2009

Summary

This summary is machine-generated.

This study models foam film behavior during drainage, revealing Marangoni-driven flows in foam channels. These flows are proportional to liquid velocity and do not rigidify channel surfaces, offering new insights into foam drainage dynamics.

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Area of Science:

Colloid and Surface Science
Fluid Dynamics
Materials Science

Background:

Foam drainage is crucial but complex, with film behavior significantly impacting Ostwald ripening and liquid loss.
Understanding foam film dynamics is key to controlling foam stability and drainage processes.

Purpose of the Study:

To develop a model linking foam film behavior to liquid flow within foam channels.
To investigate the role of Marangoni-driven recirculation counterflows and Gibbs elasticity in foam drainage.

Main Methods:

Proposed a theoretical model for foam film behavior during drainage.
Incorporated Marangoni effects and Gibbs elasticity into the model.
Compared model predictions with new experimental data.

Main Results:

Marangoni-driven counterflows in foam channels are proportional to liquid velocity.
Determined the channel permeability under these conditions.
Demonstrated that Marangoni stresses do not rigidify channel surfaces, unlike in horizontal thin films.

Conclusions:

The proposed model accurately describes the relationship between foam film behavior and liquid flow in channels.
Marangoni stresses play a distinct role in foam channel drainage compared to thin film drainage.
Findings provide a deeper understanding of liquid drainage mechanisms in aqueous foams.