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Laboratory measurements of density-driven convection in analogy with solubility trapping of geologically sequestered CO2
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Geohydrology)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Geohydrology)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Geohydrology)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Geohydrology)
2016 (English)In: Geophysical Research Abstracts, 2016, Vol. 18, article id EGU2016-13122Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Density-driven convection is of interest to several areas of groundwater-science: nuclear waste storage, industrial waste disposal, deep geothermal energy extraction, and seawater intrusion into coastal aquifers. Lately it has been identified to accelerate the rate of CO2 solubility trapping for geological CO2 storage in deep saline aquifers. We present an experimental method based on the light transmission technique and an analogue system design that enable comprehensive study of solutally induced density-driven convection in saturated porous media. The system design affords an examination of the convective process in general as well as a two-dimensional laboratoryanalogue for field phenomena. Furthermore, the method can be used to verify numerical results from density-driven flow simulation codes as part of benchmarking. With application to geological CO2 storage, we show how the method is used to measure density-driven convection in both homogenous and heterogeneous porous media andfor different Rayleigh numbers. The results demonstrate that the solute concentration distribution in the system canbe accurately determined with high spatial and temporal resolution. Thus, the onset time of convection, mass fluxand flow dynamics can be quantified for different systems under well-controlled conditions.

Place, publisher, year, edition, pages
2016. Vol. 18, article id EGU2016-13122
Keywords [en]
light-transmission, optical experiment, CO2, density-driven convection
National Category
Earth and Related Environmental Sciences
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:uu:diva-321509OAI: oai:DiVA.org:uu-321509DiVA, id: diva2:1093412
Conference
EGU General Assembly 2016
Available from: 2017-05-05 Created: 2017-05-05 Last updated: 2017-05-05

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Rasmusson, MariaFritjof, FagerlundRasmusson, KristinaNiemi, Auli
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