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BEGIN:VEVENT
DTSTAMP:20260621T092403Z
DTSTART;VALUE=DATE-TIME:20191114T130000
DTEND;VALUE=DATE-TIME:20191114T140000
SUMMARY:Theory Seminar: Shreyas Mandre (ÌÇÐÄTV)\, Surfactants driven out
  of equilibrium by a flow
TZID:Europe/London
UID:20191114-8a17841a6dde8019016e3fe7d5de49a5@warwick.ac.uk
CREATED:20191106T084948Z
DESCRIPTION:A surfactant is a chemical compound that adsorbs onto a fluid
 -fluid interface and reduces its surface tension. A non-uniform distribu
 tion of such compounds at the interface causes a Marangoni stress that d
 rives a flow\, which in turn transports the surfactant. Estimating in si
 tu the degree to which the adsorbed surfactant is out of equilibrium wit
 h the dissolved state is critical but challenging\, especially because o
 f the multiple length- and time-scales the surfactant and fluid dynamics
  span. In this presentation\, I show that combining asymptotic analysis 
 of the governing mathematical model with experimental flow visualization
  and velocimetry can furnish a near-complete description of the dynamics
 . An epitome of such a system is the axisymmetric flow driven by a stead
 y point source of surfactant on the surface of a deep liquid pool. In th
 is case\, the state of the surfactant is difficult to gauge\, without wh
 ich even simple order-of-magnitude scaling theories remain incomplete. I
  show that by examining three invariant characteristics of the flow\, an
 d without knowledge of the surfactant physicochemical parameters\, the n
 ature of the surfactant dynamics can be deduced.
LOCATION:PS1.28
CATEGORIES:Theory Seminar
LAST-MODIFIED:20191106T084948Z
ORGANIZER;CN=Gareth Alexander:
END:VEVENT
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