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SUMMARY:Dynamics and Stability of Elastocapillary interactions
DTSTART:20131209T140000
DTSTAMP:20260407T184000Z
UID:d6bfc3fc5240e0478d2e539e7f2a85021aefce9ba854e22ab35cfb61
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Arnaud Antkowiak\nBio: My research activities are currentl
 y focused on problems with strong interface deformation. These activities 
 are conducted within the new d'Alembert Institute in the very heart of Par
 is.\nDuring 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 fragmen
 tation\, which is at the heart of several fundamental geophysical (e.g. fo
 rmation of sprays at the crest of waves driving the ocean-atmosphere excha
 nges) or industrial (e.g. pulverization in combustion chambers) processes.
  This work was funded by a 2-years postdoc grant of the Fondation d'entrep
 rise EADS.\nA long time ago\, I've completed a PhD thesis on Vortex Dynami
 cs entitled "Short-term Dynamics of an Isolated Vortex". This thesis deals
  with the identification of some physical mechanisms active in swirling fl
 ows\, which are believed to play a role in their behaviours. For example\,
  these mechanisms could be of fundamental importance in the vortex meander
 ing phenomenon (erratic displacements) exhibited by airplane trailing vort
 ices\, and also encoutered in cyclonic paths (cycloidal track). Moreover t
 hese mechanisms can\, even in the absence of linear instability\, profound
 ly affect the structure of the vortex\, in supporting the development of n
 onlinear waves\, riding on the vortex core.\nFluid-structure interactions 
 are usually associated with elastic deformations imparted by the surroundi
 ng fluid's inertia: flag fluttering\, vocal folds vibrations\, submarine c
 able oscillations…\nAt smaller scale though\, a new type of fluid-struct
 ure interactions can arise. In the presence of interfaces\, capillary forc
 es may overcome inertial effects and become responsible for the deformatio
 n imparted to surrounding elastic substrates.\nThese elastocapillary pheno
 mena are all the more important that the length scales are small and/or th
 e substrate is soft. This makes them particularly relevant in the biologic
 al (neonatal pulmonary collapse\, insect adhesion...) or microfabrication 
 contexts.\nAfter reviewing the last developments in the area\, I will illu
 strate some of the elastocapillarity specifics by presenting three experim
 ents exhibiting this particular solid-fluid coupling:\n• 3D object forma
 tion and dynamical shape selection by impacting a drop over a soft membran
 e\;\n• snapping of an elastic arch with capillary forces\;\n• extracti
 on of a soft object sticking to a liquid surface\;\nI will particularly fo
 cus on the dynamics of these phenomena and their instabilities\, making el
 astocapillary settings clearly distinct from purely elastic or purely flui
 d systems.
LOCATION:MEB10 http://plan.epfl.ch/?lang=en&room=MEB10
STATUS:CONFIRMED
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