Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 12, Pages 3036-3041Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50564
Keywords
dissolution; porous media; reactive-infiltration instabilities; wormholing
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Funding
- US Department of Energy, Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences [DE-FG02-98ER14853]
- U.S. Department of Energy (DOE) [DE-FG02-98ER14853] Funding Source: U.S. Department of Energy (DOE)
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The reactive-infiltration instability, which develops when a porous matrix is dissolved by a flowing fluid, contains two important length scales. Here we outline a linear stability analysis that simultaneously incorporates both scales. We show that the commonly used thin-front model is a limiting case of a more general theory, which also includes convection-dominated dissolution as another special case. The wavelength of the instability is bounded from below and lies in the range 1 mm to 1 km for physically reasonable flow rates and reaction rates. We obtain a closed form for the growth rate when the change in porosity is small.
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