effect of anisotropic dispersion on the convective mixing in long-term CO₂ storage in saline aquifers

Carbon dioxide storage in deep saline aquifers is considered a possible option to bring greenhouse gas emissions under control. The understanding of the underlying mechanisms, such as convective mixing and associated mechanisms, affecting this mixing may have an impact on the long-term sequestration...

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Bibliographic Details
Published in:AIChE journal 2011-03, Vol.57 (3), p.561-570
Main Authors: Ghesmat, Karim, Hassanzadeh, Hassan, Abedi, Jalal
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
mixing
porous media
transport
Online Access:Get full text
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Summary:Carbon dioxide storage in deep saline aquifers is considered a possible option to bring greenhouse gas emissions under control. The understanding of the underlying mechanisms, such as convective mixing and associated mechanisms, affecting this mixing may have an impact on the long-term sequestration process in deep saline aquifers. One of the significant aspects of the flow of miscible species in porous media is velocity dependent dispersion. The effect of dispersion on dissolution of carbon dioxide (CO₂) into brine is investigated by full nonlinear numerical simulations. This study reveals that dispersion may dramatically change the trend of CO₂ dissolution into brine. It was found that the dissolution of CO₂ increases as dispersion strength increases. The mixing pattern also shows three different mechanisms: diffusion, convection, and a highly nonlinear interaction mechanism. However, the medium dispersivity ratios were found to slightly affect the mixing, while having an impact on the fingering pattern. © 2010 American Institute of Chemical Engineers AIChE J, 2011
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.12292