Jump to main content
Jump to site search

Issue 44, 2015
Previous Article Next Article

Chemical control of dissolution-driven convection in partially miscible systems: theoretical classification

Author affiliations

Abstract

Dissolution-driven convection occurs in the host phase of a partially miscible system when a buoyantly unstable density stratification develops upon dissolution. Reactions can impact such convection by changing the composition and thus the density of the host phase. Here we study the influence of A + B → C reactions on such convective dissolution when A is the dissolving species and B a reactant initially in solution in the host phase. We perform a linear stability analysis of related reaction-diffusion density profiles to compare the growth rate of the instability in the reactive case to its non reactive counterpart when all species diffuse at the same rate. We classify the stabilizing or destabilizing influence of reactions on the buoyancy-driven convection in a parameter space spanned by the solutal Rayleigh numbers RA,B,C of chemical species A, B, C and by the ratio β of initial concentrations of the reactants. For RA > 0, the non reactive dissolution of A in the host phase is buoyantly unstable. In that case, we show that the reaction is enhancing convection provided C is sufficiently denser than B. Increasing the ratio β of initial reactant concentrations increases the effect of chemistry but does not significantly impact the stabilizing/destabilizing classification. When the non reactive case is buoyantly stable (RA ≤ 0), reactions can create in time an unstable density stratification and trigger convection if RC > RB. Our theoretical approach allows classifying previous results in a unifying picture and developing strategies for the chemical control of convective dissolution.

Graphical abstract: Chemical control of dissolution-driven convection in partially miscible systems: theoretical classification

Back to tab navigation

Publication details

The article was received on 28 May 2015, accepted on 27 Aug 2015 and first published on 27 Aug 2015


Article type: Paper
DOI: 10.1039/C5CP03082J
Author version
available:
Download author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 29814-29823
  •   Request permissions

    Chemical control of dissolution-driven convection in partially miscible systems: theoretical classification

    V. Loodts, L. Rongy and A. De Wit, Phys. Chem. Chem. Phys., 2015, 17, 29814
    DOI: 10.1039/C5CP03082J

Search articles by author

Spotlight

Advertisements