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The effects of surfactant on the dynamics of bubble snap-off

Published online by Cambridge University Press:  25 April 1997

T. M. TSAI  and
MICHAEL J. MIKSIS
T. M. TSAI
Affiliation:
Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, IL 60208, USA
MICHAEL J. MIKSIS
Affiliation:
Department of Engineering Sciences and Applied Mathematics, Northwestern University, Evanston, IL 60208, USA
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Abstract

The effects of an insoluble surfactant on the motion of a drop or bubble as it is driven by a pressure gradient through a capillary tube is investigated numerically. We find that a drop in a straight capillary tube can either approach a steady-state shape or develop a re-entrant cavity at its rear. For a gas bubble moving through a constricted capillary tube, we find that snap-off can occur and surfactants enhance the snap-off process. The effects of the parameters on the dynamics of bubble snap-off are illustrated and discussed.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 337 , 25 April 1997 , pp. 381 - 410
Copyright
© 1997 Cambridge University Press

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