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Updated: Jul 3, 2025
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
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Buoyancy-Driven Dissolution Instability in a Horizontal Hele-Shaw Cell.
Kai Li1,2, Ran Hu1,2, Ting Wang3
1State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 15, 2024
Summary
Mineral dissolution in rock fractures becomes unstable due to buoyancy-driven convection. This study reveals a critical thickness for concentration boundary layers, predicting when this instability occurs in geological formations.
Area of Science:
- Geochemistry and Hydrogeology
- Pore-Scale Reactive Transport
Background:
- Mineral dissolution in rock fractures is key to geological processes.
- Buoyancy-driven convection can cause dissolution instability, but pore-scale mechanisms are unclear.
- Experimental challenges limit understanding of flow and concentration fields.
Purpose of the Study:
- To investigate pore-scale mechanisms of dissolution instability driven by buoyancy-driven convection.
- To analyze dissolution in a radial horizontal geometry using simulations and theory.
- To develop a predictive model for dissolution instability onset.
Main Methods:
- Developed and validated a pore-scale modeling approach including gravitational effects.
- Employed 3D pore-scale numerical simulations to study flow-dissolution dynamics.
- Conducted theoretical analysis of concentration boundary layers and timescale interactions.
Main Results:
- Identified a critical length criterion for the onset of buoyancy-driven dissolution instability.
- Distinguished between confined and semi-infinite domain unstable regimes.
- Demonstrated instability arises from a gravitationally unstable critical thickness of the concentration boundary layer.
Conclusions:
- Established a theoretical model, validated by simulations and experiments, to predict dissolution instability.
- Enhanced understanding of buoyancy-driven dissolution instability in radial horizontal flow.
- Provided insights relevant to karst hydrology and geological CO2 storage integrity.
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