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Phénomènes électrocinétiques et transport multiphasique en milieux poreux

Abstract : The electrokinetic coefficient is simulated in a large range of salinities using the Lattice Boltzmann method in a 2-D channel. The effect of permittivity and viscosity is discussed. The validity of the Helmholtz Smoluchowski equation using strong zeta potentials is assessed. A model of bulk fluid conductivity is derived, taking into account the local variations of conductivity which have a significant impact in the presence of polyvalent counterions. Extended to unsaturated conditions, the model shows that the electrical charge density associated to the air-water interface is a key component. The coefficient shows a non monotonous behaviour, with an enhancement compared to the saturated state. The magnitude of this enhancement depends on the dynamic state of the bubbles, moving or entrapped. The multiphase transport aspect is associated to a numerical study of the influence of the sample geometry on the measurement of the capillary pressure / saturation relationships used in hydrology.
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Submitted on : Friday, June 16, 2017 - 11:46:21 AM
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  • HAL Id : tel-01540366, version 1



Eve-Agnès Fiorentino. Phénomènes électrocinétiques et transport multiphasique en milieux poreux. Géophysique [physics.geo-ph]. Université de Strasbourg, 2016. Français. ⟨NNT : 2016STRAH008⟩. ⟨tel-01540366⟩



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