Publicou 18 edições por ano
ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561
Indexed in
THREE-DIMENSIONAL FINGERING STRUCTURE ASSOCIATED WITH GRAVITATIONALLY UNSTABLE MIXING OF MISCIBLE FLUIDS IN POROUS MEDIA
RESUMO
In the geological carbon dioxide (CO2) capture storage (CCS), the dissolution of CO2 into brine formation increases the storage security against potential leakage due to buoyancy. The density-driven natural convection between the brine and CO2 solution plays an important role in the process of dissolution in geological formations. We visualized convective mixing of miscible fluids due to the density difference in a packed bed of particles by means of an X-ray computer tomography scanning a system where the lower light layer is four times thicker than the upper dense layer. On the interface, the fingering structure associated with the Rayleigh-Taylor instability is formed. For a packed bed with particles of equal diameter, the structure of the formed fingers tends to be fine and the number density of the fingers increases with the Rayleigh number Ra. However, even for fine particles, although Ra is low, a fine fingering structure is formed. The fingers that merge with neighboring fingers to form a continuous structure extend with time and coalesce with the neighboring fingers, thereby increasing their diameter and reducing their number density. The mechanical dispersion has a strong impact on the broadening of the finger diameters and the merging process with neighboring fingers. The Sherwood number, a dimension-less measure of convective flux, is correlated with Ra with a power of 0.86. The Sherwood number for the three-dimensional Rayleigh-Taylor instability is a few times higher than those evaluated for the Rayleigh-Benard convection.
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Nasir Muhammad, Yamaguchi Ryuhei, She Yun, Patmonoaji Anindityo, Mahardika Mohammad Azis, Wang Weicen, Li Zijing, Matsushita Shintaro, Suekane Tetsuya, Hydrodynamic Fingering Induced by Gel Film Formation in Miscible Fluid Systems: An Experimental and Mathematical Study, Applied Sciences, 12, 10, 2022. Crossref