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SUMMARY:Dissipative processes in an elementary foam: the fluid dynamics of
  a junction between soap films - Théo Lenavetier (Université de Rennes)
DTSTART:20230224T130000Z
DTEND:20230224T140000Z
UID:TALK196393@talks.cam.ac.uk
CONTACT:108503
DESCRIPTION:In many consumer goods and industrial processes\, liquid foams
  are notably used for their viscoelastic behaviour. Given that their liqui
 d matrices are Newtonian fluids with viscosities lower by several orders o
 f magnitude\, their strong dissipative properties are surprising\, and rec
 ent advances have shown that they may originate from a very localised zone
  near the junctions between the foam films. To further investigate the dif
 ferent mechanisms involved there\, we designed a special frame allowing us
  to create and observe three soap films connected together with a meniscus
 . We can control the lengths of the films using three synchronized motors 
 to explore different geometries of deformation.\nUsing a fluorescent dye a
 long with a photobleaching setup\, hyperspectral cameras and tracking the 
 position of the meniscus\, we can have access to the thickness and velocit
 y fields in the fluid\, as well as the difference of surface tension betwe
 en the films. \n\nWe thus quantify the balance of surfactants going in and
  out of the meniscus during the imposed deformation. This allows us to con
 clude that the soap films exchange surfactants between them without exchan
 ging with the meniscus as they are deformed\, which is a key information t
 o add to our model describing the rheology of this elementary foam.\n
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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