GALLAIRE, François; BAROUD, Charles; DELVILLE, Jean-Pierre

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

GALLAIRE, François
Laboratoire Jean Alexandre Dieudonné [JAD]

BAROUD, Charles
Laboratoire d'hydrodynamique [LadHyX]

DELVILLE, Jean-Pierre
Centre de physique moléculaire optique et hertzienne [CPMOH]

Langue

Article de revue

Ce document a été publié dans

International Journal of Heat and Technology. 2008, vol. 26, n° 1, p. 161-166

International Information and Engineering Technology Association

Résumé en anglais

It was recently demonstrated by our group that a focused laser beam could be used to produce a net force on a moving microfluidic drop. The aim of the paper is to establish a scaling law for this net force by a examining the closely related but simpler situation of a very thin stationary circular drop of fixed shape submitted to a thermocapillary (Marangoni) stress. This leads us to recall the depth-averaged model for a microfluidic pancake-like undeformable drop submitted to a thermocapillary forcing. Our numerical method to solve the associated equations is then introduced and validated. In the case of a localized heating and for an ‘inverse' Marangoni effect (i.e. the surface tension increases with temperature) mimicking the experimental situation of a focused laser beam impinging on a surfactant laden water-oil interface, the flow field is computed and compared to experimental observations. The viscous shear stresses (normal and tangential) and the pressure force are then computed on the interface, yielding a simple expression for the total force acting on the droplet. Further numerical investigations are conducted and enable us to propose a scaling law for the net force combining all pertinent parameters.< Réduire

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798