Dynamics and Stability of Elastocapillary interactions
Event details
| Date | 09.12.2013 |
| Hour | 14:00 |
| Speaker |
Dr. Arnaud Antkowiak Bio: My research activities are currently focused on problems with strong interface deformation. These activities are conducted within the new d'Alembert Institute in the very heart of Paris. During my postdoc, I was working on atomization related problems in the Fragmentation & Mixing Team at IRPHÉ, Marseille. More specifically, I investigated the key physical mechanisms responsible for liquid fragmentation, which is at the heart of several fundamental geophysical (e.g. formation of sprays at the crest of waves driving the ocean-atmosphere exchanges) or industrial (e.g. pulverization in combustion chambers) processes. This work was funded by a 2-years postdoc grant of the Fondation d'entreprise EADS. A long time ago, I've completed a PhD thesis on Vortex Dynamics entitled "Short-term Dynamics of an Isolated Vortex". This thesis deals with the identification of some physical mechanisms active in swirling flows, which are believed to play a role in their behaviours. For example, these mechanisms could be of fundamental importance in the vortex meandering phenomenon (erratic displacements) exhibited by airplane trailing vortices, and also encoutered in cyclonic paths (cycloidal track). Moreover these mechanisms can, even in the absence of linear instability, profoundly affect the structure of the vortex, in supporting the development of nonlinear waves, riding on the vortex core. |
| Location | |
| Category | Conferences - Seminars |
Fluid-structure interactions are usually associated with elastic deformations imparted by the surrounding fluid's inertia: flag fluttering, vocal folds vibrations, submarine cable oscillations…
At smaller scale though, a new type of fluid-structure interactions can arise. In the presence of interfaces, capillary forces may overcome inertial effects and become responsible for the deformation imparted to surrounding elastic substrates.
These elastocapillary phenomena are all the more important that the length scales are small and/or the substrate is soft. This makes them particularly relevant in the biological (neonatal pulmonary collapse, insect adhesion...) or microfabrication contexts.
After reviewing the last developments in the area, I will illustrate some of the elastocapillarity specifics by presenting three experiments exhibiting this particular solid-fluid coupling:
• 3D object formation and dynamical shape selection by impacting a drop over a soft membrane;
• snapping of an elastic arch with capillary forces;
• extraction of a soft object sticking to a liquid surface;
I will particularly focus on the dynamics of these phenomena and their instabilities, making elastocapillary settings clearly distinct from purely elastic or purely fluid systems.
At smaller scale though, a new type of fluid-structure interactions can arise. In the presence of interfaces, capillary forces may overcome inertial effects and become responsible for the deformation imparted to surrounding elastic substrates.
These elastocapillary phenomena are all the more important that the length scales are small and/or the substrate is soft. This makes them particularly relevant in the biological (neonatal pulmonary collapse, insect adhesion...) or microfabrication contexts.
After reviewing the last developments in the area, I will illustrate some of the elastocapillarity specifics by presenting three experiments exhibiting this particular solid-fluid coupling:
• 3D object formation and dynamical shape selection by impacting a drop over a soft membrane;
• snapping of an elastic arch with capillary forces;
• extraction of a soft object sticking to a liquid surface;
I will particularly focus on the dynamics of these phenomena and their instabilities, making elastocapillary settings clearly distinct from purely elastic or purely fluid systems.
Practical information
- General public
- Free
Organizer
- Prof. François Gallaire
Contact
- Prof. François Gallaire