par Negrojevic, Luka 
;Comolli, Alessandro ;Brau, Fabian ;De Wit, Anne
Référence Physical Review Research, 6, L042044
Publication Publié, 2024-11-20
;Comolli, Alessandro ;Brau, Fabian ;De Wit, Anne Référence Physical Review Research, 6, L042044
Publication Publié, 2024-11-20
Article révisé par les pairs
| Résumé : | Autocatalytic reaction-diffusion fronts are localized reaction zones propagating at a constant speed with a constant width. We show both theoretically and experimentally that, if the reactant Y of the autocatalytic reaction is injected radially at a constant flow rate in a sea of the autocatalytic species X, a stationary front can be maintained at a fixed position that scales linearly with the flow rate. When this reaction front is about to reach a stationary state, a second outward traveling front emerges to adapt the outer concentration of the autocatalytic species to the stoichiometry ratio between X and Y. Simple analytical solutions to the reaction-diffusion-advection equations governing the dynamics are computed for both fronts. The analytical predictions for the stationary front position and moving front dynamics as a function of injection flow rate, reactant concentration, and gap of the quasi-two-dimensional reactor agree well with experimental results obtained with the autocatalytic chlorite-tetrathionate reaction. |
