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Mécanismes et dynamiques d’interactions entre grains et liquide : du matériau granulaire sec au mélange saturé

Abstract : Granular materials are ubiquitous, both in nature and in industry or in our daily life. Blending grains and liquid is a basic operation at the origin of many industrial processes. Nevertheless, the understanding and the modeling of the mechanisms of exchanges of liquid and grains, implied in the mixing process, remain largely unknown. In this PhD, we propose to investigate the mechanisms of interactions between a granular material containing a variable quantity of liquid and flowing dry grains. Depending on the amount of liquid, the wet granular phase can be eroded by the granular flow, or flowing grains can be captured by granular accretion or the liquid can be transported from the wet to the dry phase by impregnation. First, we focus on the mechanisms and the dynamics of granular accretion observed after the impact of a dilute granular jet on a wet granular substrate. We highlight the role of liquid interfaces on the growth dynamics and the sources of energy dissipations implied in the capture. Then, using an experiment of accretion with a dense and shear granular flow, we study the influence of the flow properties on the dynamics of capture and we propose a general accretion law. The rotating drum configuration with an isolated aggregate in a granular flow allows us to extend our investigation with the situation of unsaturated granular materials growing by accretion before being eroded. In the second part of the PhD, we study the impregnation in a dense granular jet penetrating into a liquid bath. By modeling the grains intrusion as the impregnation of a porous medium, we highlight the link between the shape of the front profile and the immersion speed. We also characterize the influence of the physico-chemical properties of the grains. This work constitutes a first step in the understanding of local phenomena implied in granular blending processes and the transition from dry to wet granular media.
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Guillaume Saingier. Mécanismes et dynamiques d’interactions entre grains et liquide : du matériau granulaire sec au mélange saturé. Physique [physics]. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS230⟩. ⟨tel-02481102v2⟩

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