Numerical and experimental investigation of buoyancy-driven dissolution in vertical fracture
| Autor: | C. Oltean, Fabrice Golfier, Michel Buès |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Buoyancy
Materials science 010504 meteorology & atmospheric sciences Flow (psychology) Péclet number engineering.material 01 natural sciences Physics::Geophysics 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake Geochemistry and Petrology 0103 physical sciences Earth and Planetary Sciences (miscellaneous) Geotechnical engineering 0105 earth and related environmental sciences Richardson number Mechanics Volumetric flow rate Forced convection Damköhler numbers Geophysics Space and Planetary Science symbols engineering Fracture (geology) |
| Zdroj: | Journal of Geophysical Research: Solid Earth. 118:2038-2048 |
| ISSN: | 2169-9313 |
| DOI: | 10.1002/jgrb.50188 |
| Popis: | [1] Alteration and dissolution resulting from reactive fluid flows in vertical fracture are investigated from numerical and laboratory experiments. Due to fluid density contrast, buoyancy effects are observed leading to significant changes in fracture geometry. Buoyant and forced convection forces act here in the same direction. The experiments were carried out at two different flow rates. When buoyancy forces are preponderant (low injection flow rate), the dissolution rate increases with the vertical distance. By contrast, for convection-dominated transport (high injection flow rate), a uniform dissolution is observed. Using numerical simulations, four dissolution regimes were identified. The fracture patterns observed strongly depend on the characteristic dimensionless numbers of the process, respectively, the Richardson, Damkohler, and Peclet numbers. The good agreement between numerical simulations and experimental results in terms of fracture patterns highlights the capability of the numerical model to describe the complex coupling between flow dynamics, buoyancy, and chemical reaction. Finally, a 3-D behavior diagram is constructed to illustrate these interactions and as a means of relating the appropriate dimensionless parameters to the morphological changes observed. |
| Databáze: | OpenAIRE |
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