BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:The role of bubble shape in the coarsening of wet 2d foams - Duria
 n\, D (UPenn Physics)
DTSTART:20140226T114500Z
DTEND:20140226T120500Z
UID:TALK51103@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-authors: Adam Roth (UPenn Physics)\, Chris Jones (UPenn Phy
 sics)\, Anthony Chieco (UPenn Physics)\, Jennifer Rieser (UPenn Physics) \
 n\nWe report on the statistics of bubble size\, topology\, and shape and o
 n their role in the coarsening dynamics for foams consisting of bubbles co
 mpressed between two parallel plates. The design of the sample cell permit
 s control of the liquid content\, through a constant pressure condition se
 t by the height of the foam above a liquid reservoir. We find that in the 
 scaling regime\, all bubble distributions are independent not only of time
  but also of liquid content. For coarsening\, the average rate decreases w
 ith liquid content due to the blocking of gas diffusion by Plateau borders
  inflated with liquid\; we achieve a factor of four reduction from the dry
  limit. By observing the growth rate of individual bubbles\, we find that 
 vonNeumann's law becomes progressively violated with increasing wetness an
 d with decreasing bubble size. We successfully model this behavior by expl
 icitly incorporating the border blocking effect into the vonNeumann argume
 nt. Two dimensionless bubbl e shape parameters naturally arise\, one of wh
 ich is primarily responsible for the violation of von~Neumann's law for fo
 ams that are not perfectly dry.\n
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR