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CATEGORIES:Fluid Mechanics (CUED)
SUMMARY:Two-phase gravity currents containing a finite vol
ume of fluid - Dr Madeleine Golding\, DAMTP
DTSTART;TZID=Europe/London:20130607T130000
DTEND;TZID=Europe/London:20130607T141500
UID:TALK44745AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/44745
DESCRIPTION:I will present a model for a two-phase gravity cur
rent resulting from the release of a finite volume
of fluid into a porous medium saturated with a se
cond\, immiscible fluid. The scenario is motivated
by the geological storage of carbon dioxide (CO2)
\, or the aftermath of a chemical spill. As it spr
eads\, the fluid in a two-phase gravity current on
ly partially displaces the ambient fluid\, leading
to a non-uniform saturation distribution. This is
the key difference from its single-phase counterp
art and gives rise to quite different behaviour.\n
\nThe three key physical two-phase phenomena incor
porated by the model are capillary pressure and re
lative permeability\, which are functions of satur
ation\, and residual trapping\, which depends on t
he historical evolution of the saturation distribu
tion. When a finite volume spreads\, such as a vol
ume of CO2 after injection has ceased\, the gravit
y current is particularly complex to model because
the height of the current increases towards the f
ront and recedes in the middle. This leads to diff
erent capillary pressure and relative permeability
curves in the two regions within the same current
\, which must be modelled consistently. Particular
ly interesting to the geological storage of CO2 is
residual trapping\, where fluid is left immobilis
ed behind the receding boundary\, and I will prese
nt a very interesting result which shows that the
choice of trapping model can determine whether the
model predicts an infinitely spreading gravity cu
rrent\, or one that will eventually stop!\n
LOCATION:LR3B\, Inglis building.
CONTACT:ROBERTA TRUPIANO
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