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240216s2024 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.3c03219
|2 doi
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|a eng
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|a Li, Kai
|e verfasserin
|4 aut
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|a Buoyancy-Driven Dissolution Instability in a Horizontal Hele-Shaw Cell
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|c 2024
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|a Text
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|a ƒaComputermedien
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|a Date Revised 27.02.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The dissolution of minerals within rock fractures is fundamental to many geological processes. Previous research on fracture dissolution has highlighted the significant role of buoyancy-driven convection leading to dissolution instability. Yet, the pore-scale mechanisms underlying this instability are poorly understood primarily due to the challenges in experimentally determining flow velocity and concentration fields. Here, we integrate pore-scale simulations with theoretical analysis to delve into the dissolution instability prompted by buoyancy-driven convection in a radial horizontal geometry. Initially, we develop a pore-scale modeling approach incorporating gravitational effects, subsequently validating it through experiments. We then employ pore-scale numerical simulations to elucidate the 3D intricacies of flow-dissolution dynamics. Our findings reveal that a simple criterion can delineate the condition for the onset of buoyancy-driven dissolution instability. If the characteristic length falls below a critical threshold, dissolution remains stable. Conversely, exceeding this threshold leads to two distinct regimes: the unstable regime of the confined domain affected by the initial aperture and the unstable regime of the semi-infinite domain independent of the initial aperture where the instability is no longer influenced by the lower boundary. We demonstrate that the pore-scale mechanism for this instability is due to the concentration boundary layer attaining a gravitationally unstable critical thickness. Through theoretical analysis of this layer and the time scales of diffusion and advection, we establish a theoretical model to predict where the dissolution instability occurs. This model aligns closely with our numerical simulations and experimental data across diverse conditions. Our work improves the understanding of buoyancy-driven dissolution instability in radial horizontal geometry. It is also of practical significance in understanding cavity formation in karst hydrology and preventing leaks in geological CO2 storage
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|a Journal Article
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|a Hu, Ran
|e verfasserin
|4 aut
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|a Wang, Ting
|e verfasserin
|4 aut
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|a Yang, Zhibing
|e verfasserin
|4 aut
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|a Chen, Yi-Feng
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 40(2024), 8 vom: 27. Feb., Seite 4186-4197
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|g volume:40
|g year:2024
|g number:8
|g day:27
|g month:02
|g pages:4186-4197
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|u http://dx.doi.org/10.1021/acs.langmuir.3c03219
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