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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20210419T141457Z
DTSTART:20210421T130000Z
DTEND:20210421T140000Z
SUMMARY:Shreyas Mandre - Surfactants driven out of equilibrium by a flow 
 
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}i1lm-klqoz7
 j0-7f2p9
DESCRIPTION:Shreyas Mandre (Warwick) joins us for this virtual seminar in
  the Physical Applied Mathematics Series\n\nThis seminar will be held vi
 a Zoom. Please email alice.thompson@manchester.ac.uk if you require the 
 meeting details.\n\nA surfactant is a chemical compound that adsorbs ont
 o a fluid-fluid interface and reduces its surface tension. A non-uniform
  distribution of such compounds at the interface causes a Marangoni stre
 ss that drives a flow\, which in turn transports the surfactant. Estimat
 ing in situ the degree to which the adsorbed surfactant is out of equili
 brium with the dissolved state is critical but challenging\, especially 
 because of the multiple length- and time-scales the surfactant and flow 
 dynamics span. In this presentation\, I show that combining asymptotic a
 nalysis of the governing mathematical model with experimental flow visua
 lization and velocimetry can furnish a near-complete description of the 
 dynamics.\n\nAn epitome of such a system is the axisymmetric flow driven
  by a steady point source of surfactant on the surface of a deep liquid 
 pool. In this case\, the state of the surfactant is difficult to gauge\,
  without which even simple order-of-magnitude scaling theories remain in
 complete. I show that by examining three invariant characteristics of th
 e flow\, and without knowledge of the surfactant physicochemical paramet
 ers\, the nature of the surfactant dynamics can be deduced.\n
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:Via Zoom.
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