Journal
TRANSPORT IN POROUS MEDIA
Volume 91, Issue 3, Pages 955-971Publisher
SPRINGER
DOI: 10.1007/s11242-011-9885-8
Keywords
Fractional flow; Saturation overshoot; Preferential flow; Traveling waves
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Funding
- Center for Frontiers of Subsurface Energy Security (CFSES), an Energy Frontier Research Center
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001114]
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Saturation overshoot is observed for 1D vertical infiltrations (liquid replacing gas) in many porous media. Aspects of these infiltrations are often described using the Richards equation, which assumes that the gas viscosity is negligible compared to the liquid viscosity. Here, we develop a multi-phase, fractional flow approach to describe the physics behind the displacement front that includes the viscosity of the gas. We show that an overshoot profile will draw in gas behind the overshoot tip. We compare the fractional flow solution to the Richards equation solution and to experimental data, and show that the air viscosity plays an observable role when the infiltrating flux is greater than 50% of the saturated conductivity.
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