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Effect of variable solubility on reactive convective dissolution
S Kabbadj1, A De Wit1, L Rongy1
1Université libre de Bruxelles (ULB), Faculté des Sciences, Nonlinear Physical Chemistry Unit, Campus de la Plaine - Boulevard du Triomphe CP231, 1050 Bruxelles, Belgium. Sylvain.Kabbadj@ulb.be.
Physical Chemistry Chemical Physics : PCCP
|December 5, 2025
Summary
Chemical reactions significantly impact solute dissolution by altering density and solubility. Understanding these effects optimizes mass transfer, crucial for applications like carbon dioxide storage.
Area of Science:
- Geochemistry
- Chemical Engineering
- Physical Chemistry
Background:
- Convective dissolution is influenced by density changes during solute dissolution.
- Chemical reactions between solutes and host phases can alter dissolution dynamics.
Purpose of the Study:
- To investigate how a reaction (A + B → C) affects convective dissolution when product C reduces solute A solubility.
- To explore conditions optimizing solute A dissolution into a host phase containing reactant B.
Main Methods:
- Theoretical study employing numerical simulations.
- Analysis of reaction-diffusion-convection (RDC) concentration distributions.
- Classification of density profiles based on key parameters.
Main Results:
- Variable solubility regimes were identified, impacting mass transfer dynamics.
- In excess reactant B, initial concentration effects on mass transfer diminished.
- Product C significantly decreasing solute A solubility led to reduced flux compared to nonreactive cases.
Conclusions:
- Reactions can either enhance or reduce solute transfer into host phases.
- Density and solubility changes driven by reactions are critical factors.
- Findings are relevant for applications such as geological carbon sequestration.
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