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Un modèle de cinétique d'évolution de populations de bulles dans un fluide à seuil

Abstract : The context of this study is to predict the swelling of bitumen drums in which radioactive salts are mixed (60 wt % of bitumen and 40 wt% of salts). Radioactivity generates uniform volume production of hydrogen by radiolysis of bitumen chains. The creation of gas occurs on very large time scales (more than a hundred years), hence the need to provide model in order to predict the swelling. It has been shown that bitumen is a yield stress fluid. Therefore this work proposes to study the influence of a continuous gas generation and a yield stress on the kinetic evolution of a bubble population. Usually, when a gas is dissolved beyond its solubility limit without yield stress or gas creation, one observes a nucleation-growth-ripening scenario (growth of large bubbles to the detriment of small ones). It selects a distribution of large bubbles over long times, independently of the initial distribution of nuclei. Our work shows that in some cases the gas creation competes with the ripening kinetics and the yield stress can make the bubble population bimodal during its evolution.
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Submitted on : Friday, January 23, 2015 - 4:22:47 PM
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  • HAL Id : hal-01108915, version 1

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Rudy Valette, Antoine Marchal, Bruno Vergnes, Arnaud Poulesquen. Un modèle de cinétique d'évolution de populations de bulles dans un fluide à seuil. Rhéologie, Groupe français de rhéologie, 2014, 26, pp.9 - 13. ⟨hal-01108915⟩

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