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Concentration measurements downstream of an insoluble monolayer front

Published online by Cambridge University Press:  30 November 2002

MICHAEL J. VOGEL  and
AMIR H. HIRSA
MICHAEL J. VOGEL
Affiliation:
Department of Mechanical, Aerospace, and Nuclear Engineering Rensselaer Polytechnic Institute, Troy, NY 12180, USA
AMIR H. HIRSA
Affiliation:
Department of Mechanical, Aerospace, and Nuclear Engineering Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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Abstract

The surfactant concentration distribution on a planar uniform flow with a surface-piercing barrier was measured via the nonlinear optical technique of second-harmonic generation. The measurements were performed for an insoluble surfactant monolayer on the air/water interface. A theoretical model balancing surface elasticity and bulk shear at the interface was developed to predict the concentration profile for any insoluble monolayer. Measured equations of state, relating the surface tension to the surfactant concentration, were used in the model along with velocity data obtained using boundary-fitted digital particle image velocimetry. Theoretical concentration profiles were in agreement with experimental results. Additionally, global predictions from the model for four different insoluble surfactant systems also showed agreement with experimental measurements.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 472 , 10 December 2002 , pp. 283 - 305
Copyright
© 2002 Cambridge University Press

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