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Marangoni effects caused by contaminants adsorbed on bubble surfaces

Published online by Cambridge University Press:  18 March 2010

PETER LAKSHMANAN  and
PETER EHRHARD
PETER LAKSHMANAN
Affiliation:
Fluid Mechanics, Biochemical & Chemical Engineering, Technische Universität Dortmund, Emil-Figge-Strasse 68, D-44221 Dortmund, Germany
PETER EHRHARD*
Affiliation:
Fluid Mechanics, Biochemical & Chemical Engineering, Technische Universität Dortmund, Emil-Figge-Strasse 68, D-44221 Dortmund, Germany
*
†Email address for correspondence: p.ehrhard@bci.tu-dortmund.de
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Abstract

The influence of Marangoni stresses, caused by contaminants adsorbed on the surface of small air bubbles, rising in water, is examined by numerical simulations. A modified level set method is used to represent the deformable bubble interface, extended by a model for the contaminant transport on the bubble surface. We show that surface tension variations of less than 2% are sufficient to generate Marangoni stresses that are strong enough to change the rising characteristics of a bubble to that of a corresponding solid particle. In such situations, we find that the bubble surface is fully covered with contaminant and the shear stress profile resembles the shear stress profile around a solid sphere.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 647: Dedicated to Professor S. H. Davis on his 70th birthday , 25 March 2010 , pp. 143 - 161
Copyright
Copyright © Cambridge University Press 2010

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