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SUMMARY:Drops in an electric field: instabilities\, bifurcations and singu
 larities - Marco Fontelos\, ICMAT\, Spain
DTSTART:20151203T113000Z
DTEND:20151203T123000Z
UID:TALK60922@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:The influence of electric fields on the shape and evolution of
  drops is an important problem in the context of technological application
 s such as electrowetting. The term electrowetting is commonly used for som
 e techniques to change the shape and wetting behaviour of liquid droplets 
 by the application of electric fields and charges. First\, we describe \nt
 he presence of symmetry breaking bifurcations and their physical role in t
 he development of instabilities. We also discuss the possible formation of
  singularities at the liquid surface. We then develop and analyze a model 
 for electrowetting that combines the Navier-Stokes system for fluid flow\,
  a phase-field model of Cahn-Hilliard type for the movement of the interfa
 ce\, a charge transport equation\, and the potential equation of electrost
 atics. A critical role in the deduction of suitable couplings between phas
 e field and other physical fields is played by ariational principles invol
 ving suitable energies
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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