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SUMMARY:Coarsening of metallic foams - Anthony Anderson (DAMTP)
DTSTART:20110121T160000Z
DTEND:20110121T170000Z
UID:TALK28849@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:Metallic foams are used as inexpensive precursors to light-wei
 ght porous solids. Unlike their aqueous counterparts\, there are no surfac
 tants available to stabilize metallic foams and\, consequently\, they coar
 sen rapidly due to the repeated coalescence of adjacent gas bubbles. Time 
 scales for coarsening are controlled by thinning and rupture processes in 
 individual lamellae (the thin liquid films separating adjacent gas bubbles
 )\, which are described in detail using matched asymptotic approximations 
 and stability analysis. One important result of these analyses is an impro
 ved prediction for the conditions at rupture immediately proceeding a coal
 escence event. Another important result is that these analyses lead natura
 lly to a macroscopic description of metallic foam\, involving several bubb
 les. I will present a network theory for two-dimensional foam in which ind
 ividual lamellae are coupled through conservation conditions at Plateau bo
 rders\, where multiple lamellae are joined. The aim of this network theory
  is to model the large-scale evolution of metallic foams and to predict th
 eir coarsening behaviour.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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