Titre :

Unstationary dynamics of drops subjected to MHz-surface acoustic waves modulated at low frequency

Auteur(s) :

Brunet, Philippe [Auteur correspondant]
Matière et Systèmes Complexes [MSC]
Baudoin, Michael [Auteur]
Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN [AIMAN-FILMS - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]

Titre de la revue :

Experiments in Fluids

Pagination :

34

Éditeur :

Springer Verlag (Germany)

Date de publication :

2022

ISSN :

0723-4864

Discipline(s) HAL :

Sciences de l'ingénieur [physics]

Résumé en anglais : [en]

In the present work, we investigate the unstationary dynamics of sessile droplets subjected to high-frequency surface acoustic waves modulated at a lower frequency close to the first inertio-capillary resonance mode of the ...
Lire la suite >In the present work, we investigate the unstationary dynamics of sessile droplets subjected to high-frequency surface acoustic waves modulated at a lower frequency close to the first inertio-capillary resonance mode of the drop. Under the action of both acoustic streaming and radiation pressure, the droplet response combines (i) a directional motion and (ii) oscillations of its shape and contact-line position. The droplet oscillations and time-averaged velocity show strong dependency on the modulation frequency. While the former dependence is linked to some resonance effects (harmonic and parametric), the latter one is still an unsolved issue. To get further insight of the underlying physics, we investigate here the fast oscillating dynamics of the drop contact line and of the dynamical contact angles through high-speed and high-resolution measurements at various modulation frequency. At odds with what is predicted and measured in stationary moving contact lines, we show that the contact-line velocity exhibits complex, non-single-valued dependence with the dynamic contact angles.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL