Optical flow focusing: Light-induced destabilization of stable liquid threads
ROBERT DE SAINT VINCENT, Matthieu
Institut de Physique de Rennes [IPR]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Institut de Physique de Rennes [IPR]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
ROBERT DE SAINT VINCENT, Matthieu
Institut de Physique de Rennes [IPR]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
< Réduire
Institut de Physique de Rennes [IPR]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Langue
en
Article de revue
Ce document a été publié dans
Physical Review Applied. 2015-10-12, vol. 4, n° 4, p. 044005 (1-8)
American Physical Society
Résumé en anglais
Confinement of flowing liquid threads by solid walls makes them stable with respect to the Rayleigh–Plateau instability. We demonstrate here that light can break this stability, by forcing locally the deformation of the ...Lire la suite >
Confinement of flowing liquid threads by solid walls makes them stable with respect to the Rayleigh–Plateau instability. We demonstrate here that light can break this stability, by forcing locally the deformation of the liquid interface through thermally-induced Marangoni stresses. Depending upon the confining conditions and fluid properties, this optocapillary deformation either pinches or inflates the thread, which may in both cases lead to its localized fragmentation into droplets. In the pinching regime, the laser beam behaves as a wall-free constriction that flow fo-cuses the thread, leading to successive regimes of single and multiple periodicity. Light-driven local Marangoni stresses may prove an elegant contactless alternative to control reversibly the thread-to-droplet transition for digital microfluidics.< Réduire
Mots clés en anglais
Drop and bubble formation
Thermocapillary effects
Surface-tension-driven instability
Origine
Importé de halUnités de recherche