Effect of dispersion on the onset of convection during CO2 sequestration
Dissolution of carbon dioxide (CO2) injected into saline aquifers causes an unstable high-density diffusive front. Understanding how instability fingers develop has received much attention because they accelerate dissolution trapping, which favours long-term sequestration. The time for the onset of convection as the dominant transport mechanism has been traditionally studied by neglecting dispersion and treating the CO2brine interface as a prescribed concentration boundary by analogy to a thermal convection problem. This work explores the effect of these simplifications. Results show that accounting for the CO2 mass flux across the prescribed concentration boundary has little effect on the onset of convection. However, accounting for dispersion causes a reduction of up to two orders of magnitude on the onset time. This implies that CO2 dissolution can be accelerated by activating dispersion as a transport mechanism, which can be achieved adopting a fluctuating injection regime. © 2009 Cambridge University Press.
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2009
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dig-idaea-es-10261-613802020-07-09T10:00:32Z Effect of dispersion on the onset of convection during CO2 sequestration Hidalgo, Juan J. Carrera, Jesús Dissolution of carbon dioxide (CO2) injected into saline aquifers causes an unstable high-density diffusive front. Understanding how instability fingers develop has received much attention because they accelerate dissolution trapping, which favours long-term sequestration. The time for the onset of convection as the dominant transport mechanism has been traditionally studied by neglecting dispersion and treating the CO2brine interface as a prescribed concentration boundary by analogy to a thermal convection problem. This work explores the effect of these simplifications. Results show that accounting for the CO2 mass flux across the prescribed concentration boundary has little effect on the onset of convection. However, accounting for dispersion causes a reduction of up to two orders of magnitude on the onset time. This implies that CO2 dissolution can be accelerated by activating dispersion as a transport mechanism, which can be achieved adopting a fluctuating injection regime. © 2009 Cambridge University Press. Financial support of the Spanish Ministry of Science and Innovation (MICINN) through the PSE-CO2 project (PSE-120000-2007- 6), of the Spanish Government through the Fundacio´ n Ciudad de la Energ´ıa-CIUDEN and the European Union through project MUSTANG (FP7-ENERGY-2008-1, project number 227286). Peer Reviewed 2012-11-28T10:45:38Z 2012-11-28T10:45:38Z 2009 2012-11-28T10:45:39Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1017/S0022112009991480 issn: 0022-1120 e-issn: 1469-7645 Journal of Fluid Mechanics 640: 441- 452 (2009) http://hdl.handle.net/10261/61380 10.1017/S0022112009991480 en #PLACEHOLDER_PARENT_METADATA_VALUE# 227286 open Cambridge University Press |
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Dissolution of carbon dioxide (CO2) injected into saline aquifers causes an unstable high-density diffusive front. Understanding how instability fingers develop has received much attention because they accelerate dissolution trapping, which favours long-term sequestration. The time for the onset of convection as the dominant transport mechanism has been traditionally studied by neglecting dispersion and treating the CO2brine interface as a prescribed concentration boundary by analogy to a thermal convection problem. This work explores the effect of these simplifications. Results show that accounting for the CO2 mass flux across the prescribed concentration boundary has little effect on the onset of convection. However, accounting for dispersion causes a reduction of up to two orders of magnitude on the onset time. This implies that CO2 dissolution can be accelerated by activating dispersion as a transport mechanism, which can be achieved adopting a fluctuating injection regime. © 2009 Cambridge University Press. |
format |
artículo |
author |
Hidalgo, Juan J. Carrera, Jesús |
spellingShingle |
Hidalgo, Juan J. Carrera, Jesús Effect of dispersion on the onset of convection during CO2 sequestration |
author_facet |
Hidalgo, Juan J. Carrera, Jesús |
author_sort |
Hidalgo, Juan J. |
title |
Effect of dispersion on the onset of convection during CO2 sequestration |
title_short |
Effect of dispersion on the onset of convection during CO2 sequestration |
title_full |
Effect of dispersion on the onset of convection during CO2 sequestration |
title_fullStr |
Effect of dispersion on the onset of convection during CO2 sequestration |
title_full_unstemmed |
Effect of dispersion on the onset of convection during CO2 sequestration |
title_sort |
effect of dispersion on the onset of convection during co2 sequestration |
publisher |
Cambridge University Press |
publishDate |
2009 |
url |
http://hdl.handle.net/10261/61380 |
work_keys_str_mv |
AT hidalgojuanj effectofdispersionontheonsetofconvectionduringco2sequestration AT carrerajesus effectofdispersionontheonsetofconvectionduringco2sequestration |
_version_ |
1777669226830495744 |