Two-phase convective mixing under a buoyant plume of CO2 in deep saline aquifers

Hamid Emami-Meybodi, Hassan Hassanzadeh

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The storage of carbon dioxide (CO2) in deep saline aquifers has been suggested as a promising method for stabilizing the atmospheric concentration of CO2. An accurate evaluation of the CO2 trapping mechanisms, such as convective mixing, is crucial for estimates of storage capacity and security. We recently investigated the gravitational stability of the diffusive boundary layer underneath a capillary transition zone by performing a linear stability analysis, which provides a quantitative description of the onset of convection for the two-phase, buoyancy-driven flow in the presence of the capillary transition zone (Emami-Meybodi and Hassanzadeh, 2013). In this paper, we further examine the effect of the capillary transition zone on the onset of convection and subsequent convective mixing using direct numerical simulations. We describe key features of the two-phase convective mixing for systems with low Rayleigh numbers (Ra≤1000) and the measurement of several global quantities, such as the total CO2 dissolution, Sherwood number, swelling factor, and interface velocity. We show that the commonly used assumption of a sharp CO2-brine interface with constant CO2 concentration at the top of an aquifer (i.e. single-phase system) may lead to erroneous estimates of not only the onset of convection, but also of the rate and magnitude of CO2 dissolution. The significant effect of the capillary transition zone on the dissolution of CO2 under a buoyant plume in saline aquifers is explained; and, the link between the capillary transition zone and the volume change, due to CO2 dissolution and the interface velocity over the mixing process, is demonstrated. Compared to the single-phase system, a crossflow through the interface of the diffusive boundary layer with the capillary transition zone, as well as the upward advance of the interface motion, may enhance the convective mixing early in the period of natural convection. The decrease in the onset time and stronger mass flux may be more profound in the two-phase system than in the previously reported single-phase models. Furthermore, we report several scaling relationships that characterize the mixing process in the presence of the capillary transition zone. Our findings provide further insight into the understanding of the two-phase mixing features and the long-term fate of the injected CO2 in deep saline aquifers.

Original languageEnglish (US)
Pages (from-to)55-71
Number of pages17
JournalAdvances in Water Resources
Volume76
DOIs
StatePublished - Jan 1 2015

Fingerprint

transition zone
plume
aquifer
convection
dissolution
boundary layer
Rayleigh number
volume change
stability analysis
swelling
buoyancy
brine
trapping
carbon dioxide
simulation

All Science Journal Classification (ASJC) codes

  • Water Science and Technology

Cite this

@article{f70d61f1fd5e4ac8afd9252932a4fc84,
title = "Two-phase convective mixing under a buoyant plume of CO2 in deep saline aquifers",
abstract = "The storage of carbon dioxide (CO2) in deep saline aquifers has been suggested as a promising method for stabilizing the atmospheric concentration of CO2. An accurate evaluation of the CO2 trapping mechanisms, such as convective mixing, is crucial for estimates of storage capacity and security. We recently investigated the gravitational stability of the diffusive boundary layer underneath a capillary transition zone by performing a linear stability analysis, which provides a quantitative description of the onset of convection for the two-phase, buoyancy-driven flow in the presence of the capillary transition zone (Emami-Meybodi and Hassanzadeh, 2013). In this paper, we further examine the effect of the capillary transition zone on the onset of convection and subsequent convective mixing using direct numerical simulations. We describe key features of the two-phase convective mixing for systems with low Rayleigh numbers (Ra≤1000) and the measurement of several global quantities, such as the total CO2 dissolution, Sherwood number, swelling factor, and interface velocity. We show that the commonly used assumption of a sharp CO2-brine interface with constant CO2 concentration at the top of an aquifer (i.e. single-phase system) may lead to erroneous estimates of not only the onset of convection, but also of the rate and magnitude of CO2 dissolution. The significant effect of the capillary transition zone on the dissolution of CO2 under a buoyant plume in saline aquifers is explained; and, the link between the capillary transition zone and the volume change, due to CO2 dissolution and the interface velocity over the mixing process, is demonstrated. Compared to the single-phase system, a crossflow through the interface of the diffusive boundary layer with the capillary transition zone, as well as the upward advance of the interface motion, may enhance the convective mixing early in the period of natural convection. The decrease in the onset time and stronger mass flux may be more profound in the two-phase system than in the previously reported single-phase models. Furthermore, we report several scaling relationships that characterize the mixing process in the presence of the capillary transition zone. Our findings provide further insight into the understanding of the two-phase mixing features and the long-term fate of the injected CO2 in deep saline aquifers.",
author = "Hamid Emami-Meybodi and Hassan Hassanzadeh",
year = "2015",
month = "1",
day = "1",
doi = "10.1016/j.advwatres.2014.11.011",
language = "English (US)",
volume = "76",
pages = "55--71",
journal = "Advances in Water Resources",
issn = "0309-1708",
publisher = "Elsevier Limited",

}

Two-phase convective mixing under a buoyant plume of CO2 in deep saline aquifers. / Emami-Meybodi, Hamid; Hassanzadeh, Hassan.

In: Advances in Water Resources, Vol. 76, 01.01.2015, p. 55-71.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Two-phase convective mixing under a buoyant plume of CO2 in deep saline aquifers

AU - Emami-Meybodi, Hamid

AU - Hassanzadeh, Hassan

PY - 2015/1/1

Y1 - 2015/1/1

N2 - The storage of carbon dioxide (CO2) in deep saline aquifers has been suggested as a promising method for stabilizing the atmospheric concentration of CO2. An accurate evaluation of the CO2 trapping mechanisms, such as convective mixing, is crucial for estimates of storage capacity and security. We recently investigated the gravitational stability of the diffusive boundary layer underneath a capillary transition zone by performing a linear stability analysis, which provides a quantitative description of the onset of convection for the two-phase, buoyancy-driven flow in the presence of the capillary transition zone (Emami-Meybodi and Hassanzadeh, 2013). In this paper, we further examine the effect of the capillary transition zone on the onset of convection and subsequent convective mixing using direct numerical simulations. We describe key features of the two-phase convective mixing for systems with low Rayleigh numbers (Ra≤1000) and the measurement of several global quantities, such as the total CO2 dissolution, Sherwood number, swelling factor, and interface velocity. We show that the commonly used assumption of a sharp CO2-brine interface with constant CO2 concentration at the top of an aquifer (i.e. single-phase system) may lead to erroneous estimates of not only the onset of convection, but also of the rate and magnitude of CO2 dissolution. The significant effect of the capillary transition zone on the dissolution of CO2 under a buoyant plume in saline aquifers is explained; and, the link between the capillary transition zone and the volume change, due to CO2 dissolution and the interface velocity over the mixing process, is demonstrated. Compared to the single-phase system, a crossflow through the interface of the diffusive boundary layer with the capillary transition zone, as well as the upward advance of the interface motion, may enhance the convective mixing early in the period of natural convection. The decrease in the onset time and stronger mass flux may be more profound in the two-phase system than in the previously reported single-phase models. Furthermore, we report several scaling relationships that characterize the mixing process in the presence of the capillary transition zone. Our findings provide further insight into the understanding of the two-phase mixing features and the long-term fate of the injected CO2 in deep saline aquifers.

AB - The storage of carbon dioxide (CO2) in deep saline aquifers has been suggested as a promising method for stabilizing the atmospheric concentration of CO2. An accurate evaluation of the CO2 trapping mechanisms, such as convective mixing, is crucial for estimates of storage capacity and security. We recently investigated the gravitational stability of the diffusive boundary layer underneath a capillary transition zone by performing a linear stability analysis, which provides a quantitative description of the onset of convection for the two-phase, buoyancy-driven flow in the presence of the capillary transition zone (Emami-Meybodi and Hassanzadeh, 2013). In this paper, we further examine the effect of the capillary transition zone on the onset of convection and subsequent convective mixing using direct numerical simulations. We describe key features of the two-phase convective mixing for systems with low Rayleigh numbers (Ra≤1000) and the measurement of several global quantities, such as the total CO2 dissolution, Sherwood number, swelling factor, and interface velocity. We show that the commonly used assumption of a sharp CO2-brine interface with constant CO2 concentration at the top of an aquifer (i.e. single-phase system) may lead to erroneous estimates of not only the onset of convection, but also of the rate and magnitude of CO2 dissolution. The significant effect of the capillary transition zone on the dissolution of CO2 under a buoyant plume in saline aquifers is explained; and, the link between the capillary transition zone and the volume change, due to CO2 dissolution and the interface velocity over the mixing process, is demonstrated. Compared to the single-phase system, a crossflow through the interface of the diffusive boundary layer with the capillary transition zone, as well as the upward advance of the interface motion, may enhance the convective mixing early in the period of natural convection. The decrease in the onset time and stronger mass flux may be more profound in the two-phase system than in the previously reported single-phase models. Furthermore, we report several scaling relationships that characterize the mixing process in the presence of the capillary transition zone. Our findings provide further insight into the understanding of the two-phase mixing features and the long-term fate of the injected CO2 in deep saline aquifers.

UR - http://www.scopus.com/inward/record.url?scp=84929641544&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84929641544&partnerID=8YFLogxK

U2 - 10.1016/j.advwatres.2014.11.011

DO - 10.1016/j.advwatres.2014.11.011

M3 - Article

AN - SCOPUS:84929641544

VL - 76

SP - 55

EP - 71

JO - Advances in Water Resources

JF - Advances in Water Resources

SN - 0309-1708

ER -