Journal
PHYSICAL REVIEW E
Volume 87, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.87.023015
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Funding
- US Department of Energy [DE-SC0003907, DE-FE0002041]
- MIT/Masdar Institute Program
- MIT Energy Fellows Program
- Martin Family Society of Fellows for Sustainability
- David Crighton Fellowship
- Royal Society University Research Fellowship
- Royal Society Wolfson Research Merit Award
- Reed Research Fund
- ARCO Chair in Energy Studies
- U.S. Department of Energy (DOE) [DE-SC0003907] Funding Source: U.S. Department of Energy (DOE)
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We study the gravity-exchange flow of two immiscible fluids in a porous medium and show that, in contrast with the miscible case, a portion of the initial interface remains pinned at all times. We elucidate, by means of micromodel experiments, the pore-level mechanism responsible for capillary pinning at the macroscale. We propose a sharp-interface gravity-current model that incorporates capillarity and quantitatively explains the experimental observations, including the x similar to t(1/2) spreading behavior at intermediate times and the fact that capillarity stops a finite-release current. Our theory and experiments suggest that capillary pinning is potentially an important, yet unexplored, trapping mechanism during CO2 sequestration in deep saline aquifers. DOI: 10.1103/PhysRevE.87.023015
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