Chemically Driven Hydrodynamic Instabilities

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Experimental two dimensional cellular flames

International audienceThe propagation of very unstable cellular flames (also called self-turbulent flames) is studied experimentally in a Hele-Shaw cell. This quasi-two dimensional configuration allows for quantitative image analysis. The dynamics of the premixed flame is controlled in these conditions by the creation or merging of the cusps that appear on the front

Chemically Driven Hydrodynamic Instabilities

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Chemical abundances of Seyfert 2 AGNs, I: comparing oxygen abundances from distinct methods using SDSS

We compare the oxygen abundance (O/H) of the narrow-line regions (NLRs) of Seyfert 2 AGNs obtained through strong-line methods and from direct measurements of the electron temperature (Te-method). The aim of this study is to explore the effects of the use of distinct methods on the range of metallicity and on the mass-metallicity relation of active galactic nuclei (AGNs) at low redshifts (z<~0.4). We used the Sloan Digital Sky Survey (SDSS) and NASA/IPACExtragalactic Database (NED) to selected optical (3000Fil: Dors, Oli L.. Universidade Do Vale Do Paraiba; BrasilFil: de Freitas Rosa, Morsyleide. Universidade Do Vale Do Paraiba; BrasilFil: Amores, E. B.. Universidade Estadual de Feira de Santana; BrasilFil: Almarcha Pérez, Martha Ayelén. Instituto de Astrofísica de Andalucía - Csic; EspañaFil: Cardaci, Monica Viviana. Instituto de Astrofísica de la Plata (conicet- Universidad Nacional de la Plata); Argentina. Universidad Nacional de La Plata; ArgentinaFil: Hägele, Guillermo Federico. Universidad Nacional de La Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Armah, M.. Universidade Do Vale Do Paraiba; BrasilFil: Krabbe, A. C.. Universidade Do Vale Do Paraiba; BrasilFil: Ruiz Faúndez, Giovanni Patricio. Laboratorio Nacional de Astrofisica, Itajuba; Brasi

Experimental investigation of self-turbulent premixed flames

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Flammes libres dans des tubes

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Chemically Enhanced Convective Dissolution of CO2

International audienceConvective dissolution, one of the main mechanisms for geological storage of CO_{2}, occurs when supercritical or gas CO_{2} dissolves partially into an aqueous solution, thus triggering downward convection of the denser CO_{2}-enriched liquid. Chemical reaction in the liquid can greatly enhance the process. Here, experimental measurements of convective flow inside a cylinder filled with a sodium hydroxide (NaOH) solution show that the plume's velocity can be increased tenfold as compared to a situation with no NaOH. This tremendous effect is predicted by a model with no adjusting parameters