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SUMMARY:CCS &amp\; permeability: thinking about uncertainty through a pert
 urbation analysis and Bubble growth in alkaline electrolysis - Emily Flico
 s\, IEEF and James Morris\, IEEF
DTSTART:20241114T113000Z
DTEND:20241114T123000Z
UID:TALK223816@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:*Emily Flicos\nCCS & permeability: thinking about uncertainty 
 through a perturbation analysis*\n\nOne of the challenges with modelling s
 ubsurface flows is the uncertainty in measurements of geological propertie
 s\, mostly due to limited resolution in observation methods. These propert
 ies can be highly heterogeneous and this heterogeneity can have a large ef
 fect on plume migration. Many subsurface flows can be modelled as a gravit
 y current\, which\, for uniform material properties\, has a well character
 ised similarity solution. The similarity solution forms the mean about whi
 ch we perform a perturbation analysis\, treating the uncertainty in permea
 bility as deviations from a mean. \n\nWe restrict our focus to permeabilit
 y fields which vary laterally\, or across the flow\, starting with the sim
 ple case of a sinusoidal perturbation to a uniform mean. At early times\, 
 the height and nose position of the current are determined by the local pe
 rmeability and deviations to the height and nose grow at the same rate as 
 the mean\, proportional to the amplitude of the permeability variation. Th
 e transition between the early and late time regimes is governed by the wa
 velength of the permeability. At late times\, lateral spreading is dominan
 t\; the height deviations decay and the nose deviations approach a steady 
 state. The magnitude of both depend on the product of permeability wavelen
 gth and amplitude.\n\nThe single mode sets the groundwork for looking at m
 ore complex\, multimodal permeabilities\, with more complex results.\n\n*J
 ames Morris\nBubble growth in alkaline electrolysis*\n\nIn the production 
 of hydrogen via electrolysis\, bubbles of hydrogen and oxygen must grow an
 d detach from the electrode. Discussion of factors effecting rate of bubbl
 e growth and final detachment volume\, and their contribution to overall e
 fficiency.
LOCATION:Open Plan Area\, Institute for Energy and Environmental Flows\, M
 adingley Rise CB3 0EZ
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