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SUMMARY:On the production of high-porosity metallic solids - Stewart\, P (
 University of Glasgow)
DTSTART:20140626T095000Z
DTEND:20140626T102000Z
UID:TALK53185@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Co-author: Stephen Davis (Northwestern University) \n\nHigh-po
 rosity metallic solids are useful as lightweight materials in many enginee
 ring disciplines. However\, batch processing techniques for producing such
  materials by solidification of a molten metallic foam are problematic\, a
 nd it is not currently possible to control the porosity distribution of th
 e final product {it a priori}. The molten metallic foam is inherently unst
 able\; the thin liquid bridges between bubbles drain rapidly and rupture d
 ue to intermolecular forces\, leading to bubble coalescence and large-scal
 e topological rearrangement. In this talk we will consider the competition
  between coalesecence and freezing in these dynamically evolving foams\, e
 xamining in particular the coupling between the microscale hydrodynamics i
 n the molten liquid films and the progression of a solidification front. T
 he foam is modelled as a coupled system of free boundary problems involvin
 g both liquid/gas and liquid/solid interfaces\, which we solve using a com
 bination of asymptotic and numerical techniques. An understanding of these
  microscale processes motivates other protocols for solid foam production 
 where the porosity distribution of the final product can be more effective
 ly controlled.\n
LOCATION:Seminar Room 1\, Newton Institute
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