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SUMMARY:Fluid mechanical processes during geological sequestration of carb
 on dioxide - Professor John Lister\, DAMTP
DTSTART:20140127T180000Z
DTEND:20140127T190000Z
UID:TALK46598@talks.cam.ac.uk
CONTACT:Beverley Larner
DESCRIPTION:Carbon dioxide (CO2) levels in the atmosphere are rising rapid
 ly as a result of anthropogenic emissions. One proposal to reduce CO2 emis
 sions and mitigate climate change is carbon capture and storage (CCS). The
  storage part of this involves large-scale injection of captured and compr
 essed CO2 into deep porous rock formations such as saline aquifers. Many a
 spects of the resultant porous flows pose fundamental and interesting flui
 d-mechanical questions\, and these will be the subject of the lecture. The
  physical ideas will be illustrated with movies of analogue laboratory exp
 eriments and numerical simulations.\n\nThe buoyant CO2 rises and spreads b
 eneath the overlying impermeable “cap-rock” as a so-called gravity cur
 rent\, and the undesirable possibility of upward leakage through any fract
 ures must be assessed. Fortunately\, a number of long-term trapping mechan
 isms exist. One such\, dissolution of CO2 into the underlying brine\, prod
 uces a denser solution which\, being denser\, convects reassuringly downwa
 rds. A key question is then the rate of dissolution\, which depends on stu
 dy of vigorous convection in a porous medium. This has recently been shown
  to have a strikingly different form from the more familiar convection in 
 a pure fluid. Given the dissolution flux\, the evolution towards saturatio
 n in a confined aquifer\, or the erosion of the spreading gravity currents
  in open aquifers\, can be calculated. 
LOCATION:Bristol-Myers-Squibb Lecture theatre\, Department of Chemistry
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