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Eddies and interface deformations induced by optical streaming

Published online by Cambridge University Press:  18 October 2011

H. Chraibi ,
R. Wunenburger ,
D. Lasseux ,
J. Petit  and
J.-P. Delville
H. Chraibi*
Affiliation:
Université de Bordeaux, LOMA, CNRS UMR 5798, F-33400 Talence, France
R. Wunenburger
Affiliation:
Université de Bordeaux, LOMA, CNRS UMR 5798, F-33400 Talence, France
D. Lasseux
Affiliation:
Université de Bordeaux, I2M, CNRS UMR 5295, F-33600 Pessac, France
J. Petit
Affiliation:
Université de Bordeaux, LOMA, CNRS UMR 5798, F-33400 Talence, France
J.-P. Delville
Affiliation:
Université de Bordeaux, LOMA, CNRS UMR 5798, F-33400 Talence, France
*
†Email address for correspondence: h.chraibi@loma.u-bordeaux1.fr
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Abstract

We study flows and interface deformations produced by the scattering of a laser beam propagating through non-absorbing turbid fluids. Light scattering produces a force density resulting from the transfer of linear momentum from the laser to the scatterers. The flow induced in the direction of the beam propagation, called ‘optical streaming’, is also able to deform the interface separating the two liquid phases and to produce wide humps. The viscous flow taking place in these two liquid layers is solved analytically, in one of the two liquid layers with a stream function formulation, as well as numerically in both fluids using a boundary integral element method. Quantitative comparisons are shown between the numerical and analytical flow patterns. Moreover, we present predictive simulations regarding the effects of the geometry, of the scattering strength and of the viscosities, on both the flow pattern and the deformation of the interface. Finally, theoretical arguments are put forth to explain the robustness of the emergence of secondary flows in a two-layer fluid system.

JFM classification

Low-Reynolds-number flows: Boundary integral methods Drops and Bubbles: Electrohydrodynamic effects Interfacial Flows (free surface): Interfacial Flows (free surface)
Type
Papers
Information
Journal of Fluid Mechanics , Volume 688 , 10 December 2011 , pp. 195 - 218
Copyright
Copyright © Cambridge University Press 2011

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