Dispersion de solutés réactifs en milieux poreux chimiquement hétérogènes

Abstract : The aim of this investigation is to show the effect of the chemical heterogeneity of saturated porous media on the increase of reactive dispersion comparing to the classical hydrodynamic one. The experiments consist on inert and reactive tracing of chemically heterogeneous porous media at the chromatography scale. The media are physically homogeneous and are composed of two types of materials. A riatural sand representing the inert phase and sorne grains impregnated with the active phase. The chemical heterogeneity scale depends on the number of active grains into the media, the more numerous they are, the less heterogeneous the medium is. The main result is that the use of perfectly controlled systems has showed that reactive. solute dispersion into chemically heterogeneous media is different from but not independant of the hydrodynamic one. It increases linearly with the chemical heterogeneity scale. However, the effect of heterogeneity on the global reactive dispersion is independent on any kinetics. The two effects are simply added to each other. Modelling based on mixing cells in series applyed to reactive transport into heterogeneous media led to coherent results with tlte experimental ones.
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Safia Semra. Dispersion de solutés réactifs en milieux poreux chimiquement hétérogènes. Autre. Institut National Polytechnique de Lorraine, 2003. Français. ⟨NNT : 2003INPL055N⟩. ⟨tel-01749857⟩

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