Expériences d'écoulement de fluides à seuil en milieu poreux comme nouvelle méthode de porosimétrie

Abstract : Current experimental methods used to determine pore size distributions (PSD)of porous media present several drawbacks such as toxicity of the employed fluids (e.g., mercury porosimetry). The theoretical basis of a new method to obtain the PSD by injecting yield stress fluids through porous media and measuring the flow rate Q at several pressure gradients ∇P was proposed in the literature. On the basis of these theoretical considerations,an intuitive approach to obtain PSD from Q(∇P) is presented in this work. It relies on considering the extra increment of Q when ∇P is increased, as a consequence of the pores of smaller radius newly incorporated to the flow. This procedure is first tested and validated on numerically generated experiments. Then, it is applied to exploit data coming from laboratory experiments and the obtained PSDs are compared to those deduced by mercury porosimetry and micro tomography.
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Submitted on : Friday, September 26, 2014 - 2:57:12 PM
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Antonio Rodriguez de Castro. Expériences d'écoulement de fluides à seuil en milieu poreux comme nouvelle méthode de porosimétrie. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2014. Français. ⟨NNT : 2014ENAM0021⟩. ⟨pastel-01068908⟩

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