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SUMMARY:Influence of chemical reactions on buoyancy-driven fingering in po
 rous media - Professor Anne de Wit\, Université Libre de Bruxelles
DTSTART:20140116T113000Z
DTEND:20140116T123000Z
UID:TALK49872@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:We investigate both experimentally and theoretically the influ
 ence of chemical reactions on the properties of buoyancy-driven convective
  fingering arising when two miscible or partially miscible liquids are put
  in contact in the gravity field in a porous medium or Hele-Shaw cell. We 
 show that\, in the case of miscible liquids\, a chemical reaction can brea
 k the symmetry of the fingering patterns as fingers can develop on one sid
 e of the contact line only and not both up and downwards as in the non rea
 ctive situation. In some cases\, the dynamical in-situ generation of the p
 roduct of the reaction can even lead to the co-existence of different conv
 ective modes. The experiments are performed using an aqueous solution of a
 n acid put in contact in a Hele-Shaw cell with a miscible aqueous solution
  of a base. The numerical simulations are made on the basis of a reaction-
 diffusion-convection model coupling Darcy’s law to the evolution equatio
 ns of the concentrations of the various chemicals involved. Good agreement
  between experimental results and theory is obtained. In the case of parti
 ally miscible liquids\, we show that chemical reactions are also able to c
 ontrol the fingering pattern. 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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