Behavior of supercritical CO2 injected into porous media containing water
| Autor: | Satoshi Iwatani, Shuichiro Hirai, Shingo Soukawa, Shoji Tsushima, Tetsuya Suekane |
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| Rok vydání: | 2005 |
| Předmět: |
Packed bed
Chemistry Capillary action Mechanical Engineering Bubble Lattice Boltzmann methods Mineralogy Building and Construction Mechanics Pollution Industrial and Manufacturing Engineering Supercritical fluid General Energy Electrical and Electronic Engineering Saturation (chemistry) Porous medium Relative permeability Physics::Atmospheric and Oceanic Physics Civil and Structural Engineering |
| Zdroj: | Energy. 30:2370-2382 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2003.10.026 |
| Popis: | This paper describes our preliminary study consisting of experimental and numerical research on supercritical CO2 in a porous medium containing liquid water. We used a magnetic resonance imaging (MRI) technique to directly visualize the distribution of supercritical CO2 injected into a packed bed of glass beads containing water. After the CO2 displaced much of the water, some water remained near the central axis, although there were several millimeter-sized, CO2-rich channels running through this water-rich region. Water moves downward swiftly due to gravity. To better understand the results, we also used the lattice Boltzmann method (LBM) to numerically simulate this system. In a parallel channel with hydrophilic surfaces, a high velocity of water between the bubbles along the flow direction results in a high relative permeability at low water saturations. At high CO2 saturations, a stable layer flow occurred. Thus, the relative permeability of water decreased sharply with saturation decreasing. The effect of capillary contraction along the flow direction was also simulated. The flow through a narrow channel consisted of water and periodic passages of a CO2 bubble. Channels with smaller cross-sectional areas have faster flow speeds, especially for a CO2 bubble. When the flow is funneled into a small channel, the funnel surface tends to trap CO2 bubbles, even when the surface is hydrophilic. |
| Databáze: | OpenAIRE |
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