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Fluid flows driven by light scattering

Published online by Cambridge University Press:  15 November 2010

R. WUNENBURGER*
Affiliation:
Centre de Physique Moléculaire Optique et Hertzienne, UMR CNRS 5798, Université Bordeaux I, 351 cours de la Libération, 33405 Talence CEDEX, France
B. ISSENMANN
Affiliation:
Centre de Physique Moléculaire Optique et Hertzienne, UMR CNRS 5798, Université Bordeaux I, 351 cours de la Libération, 33405 Talence CEDEX, France
E. BRASSELET
Affiliation:
Centre de Physique Moléculaire Optique et Hertzienne, UMR CNRS 5798, Université Bordeaux I, 351 cours de la Libération, 33405 Talence CEDEX, France
C. LOUSSERT
Affiliation:
Centre de Physique Moléculaire Optique et Hertzienne, UMR CNRS 5798, Université Bordeaux I, 351 cours de la Libération, 33405 Talence CEDEX, France
V. HOURTANE
Affiliation:
Centre de Physique Moléculaire Optique et Hertzienne, UMR CNRS 5798, Université Bordeaux I, 351 cours de la Libération, 33405 Talence CEDEX, France
J.-P. DELVILLE
Affiliation:
Centre de Physique Moléculaire Optique et Hertzienne, UMR CNRS 5798, Université Bordeaux I, 351 cours de la Libération, 33405 Talence CEDEX, France
*
†Email address for correspondence: r.wunenburger@cpmoh.u-bordeaux1.fr
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Abstract

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We report on the direct experimental observation of laser-induced flows in isotropic liquids that scatter light. We use a droplet microemulsion in the two-phase regime, which behaves like a binary mixture. Close to its critical consolute line, the microemulsion undergoes large refractive index fluctuations that scatter light. The radiation pressure of a laser beam is focused onto the soft interface between the two phases of the microemulsion and induces a cylindrical liquid jet that continuously emits droplets. We demonstrate that this dripping phenomenon takes place as a consequence of a steady flow induced by the transfer of linear momentum from the optical field to the liquid due to light scattering. We first show that the cylindrical jet guides light as a step-index liquid optical fiber whose core diameter is self-adapted to the light itself. Then, by modelling the light-induced flow as a low-Reynolds-number, parallel flow, we predict the dependence of the dripping flow rate on the thermophysical properties of the microemulsion and the laser beam power. Satisfying agreement is found between the model and experiments.

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Copyright © Cambridge University Press 2010