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Title: Effect of Dispersion on Solutal Convection in Porous Media

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2018gl079849· OSTI ID:1539751

Abstract Solutal convection in porous media is thought to be controlled by the molecular Rayleigh number, R a m , the ratio of the buoyant driving force over diffusive dissipation. The mass flux should increase linearly with R a m and the finger spacing should decrease as . Instead, our experiments find that flux levels off at large R a m and finger spacing increases with R a m . Here we show that the convective pattern is controlled by a dispersive Rayleigh number, R a d , balancing buoyancy and dispersion. Increasing the bead size of the porous medium increases R a m but decreases R a d and hence coarsens the pattern. While the flux is predominantly controlled by R a m , the anisotropy of mechanical dispersion leads to an asymmetry in the pattern that limits the flux at large bead sizes.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Frontiers of Subsurface Energy Security (CFSES); Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0001114
OSTI ID:
1539751
Alternate ID(s):
OSTI ID: 1479150
Journal Information:
Geophysical Research Letters, Vol. 45, Issue 18; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Cited By (4)

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Rayleigh-Darcy convection with hydrodynamic dispersion journal December 2018
On Moderate-Rayleigh-Number Convection in an Inclined Porous Layer journal May 2019
Transmissibility Upscaling on Unstructured Grids for Highly Heterogeneous Reservoirs journal December 2019