Convective Mixing Induced by Acid-Base Reactions

C. Almarcha, P.M.J. Trevelyan, Y. R’Honi, Y. De Decker, K. Eckert, A. De Wit

Research output: Contribution to journalArticlepeer-review


When two miscible solutions, each containing a reactive species, are put in contact in the gravity field, local variations in the density due to the reaction can induce convective motion and mixing. We characterize here both experimentally and theoretically such buoyancy-driven instabilities induced by the neutralization of a strong acid by a strong base in aqueous solutions. The diverse patterns obtained are shown to depend on the type of reactants used and on their relative concentrations. They have their origin in a combination of classical hydrodynamic instabilities including differential diffusion of the solutes involved while temperature effects only play a marginal role.
Original languageEnglish
Pages (from-to)9739 - 9744
Number of pages5
JournalJournal of Physical Chemistry B
Issue number32
Publication statusPublished - 11 Jul 2011


  • reaction-diffusion-convection
  • buoyancy instabilities
  • porous media


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