期刊
ADVANCES IN WATER RESOURCES
卷 34, 期 3, 页码 327-339出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.advwatres.2010.12.012
关键词
Density-driven natural convection; CO2; Porous media; Mass transfer; Heterogeneity
The efficiency of mixing in density-driven natural-convection is largely governed by the aquifer permeability, which is heterogeneous in practice. The character (fingering, stable mixing or channeling) of flow-driven mixing processes depends primarily on the permeability heterogeneity character of the aquifer, i.e., on its degree of permeability variance (Dykstra-Parsons coefficient) and the correlation length. Here we follow the ideas of Waggoner et al. (1992) [13] to identify different flow regimes of a density-driven natural convection flow by numerical simulation. Heterogeneous fields are generated with the spectral method of Shinozuka and Jan (1972)[13], because the method allows the use of power-law variograms. In this paper, we extended the classification of Waggoner et al. (1992) [13] for the natural convection phenomenon, which can be used as a tool in selecting optimal fields with maximum transfer rates of CO2 into water. We observe from our simulations that the rate of mass transfer of CO2 into water is higher for heterogeneous media. (C) 2010 Elsevier Ltd. All rights reserved.
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