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SUMMARY:Stability and dynamics of a single Plateau border - Christophe Rau
 faste (Université Côte d'Azur\, Nice)
DTSTART:20180322T130000Z
DTEND:20180322T140000Z
UID:TALK101731@talks.cam.ac.uk
CONTACT:Anne Herrmann
DESCRIPTION:Assemblies of soap bubbles in close contact display geometrica
 l patterns dictated by the principle of energy minimization. Thus Joseph P
 lateau formulated in the 19th century that soap films and Plateau borders\
 , which are the liquid channels found at the intersection between three fi
 lms\, exhibit regular angles.\nWhat is not formulated in Plateau’s laws 
 is why such assemblies are (meta)stable. For instance\, it is at first sur
 prising that Plateau borders are not subject to the Rayleigh Plateau insta
 bility unlike liquid filaments.\nDuring this foam-lunch I will present exp
 eriments that probe the stability of the Plateau borders using several typ
 es of perturbations. We will make the link between the stability and a neg
 ative effective surface tension that drives the relaxation dynamics. For s
 ome regimes\, this relaxation is strong enough to trigger fast and inertia
 l flows characterized by strongly nonlinear features such as hydraulic jum
 ps and solitons.
LOCATION:MR11\, Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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