Etude expérimentale des écoulements polyphasiques : phénomènes interfaciaux

Abstract : The present work was devoted to the experimental study of the multiphase flow around inclusions in both Newtonian and non-Newtonian media at respectively microscopic and mesoscopic scales, by means of the particle image velocimetry (PIV) and fast camera visualization. In viscoelastic and shear-thinning fluids, we characterized the flow around an isolated inclusion (gas or solid) by performing the measurements of velocity fields. These results were used to confirm the viscoelastic origin of the negative wake and to describe its characteristics. New coalescence scenarios between two bubbles in a bubble train were also highlighted. The deformation of a liquid-liquid interface due to the passage of an inclusion was investigated by original experiments. The results thus obtained permitted to describe the dynamics of the phenomenon and to define its dimensionless numbers in the case of a bubble, and to put into evidence interfacial instabilities in the wake of a solid inclusion. Lastly, the ring bubbles in water were studied experimentally from the formation, the rise until their fragmentation
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Mohammed Kemiha. Etude expérimentale des écoulements polyphasiques : phénomènes interfaciaux. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL033N⟩. ⟨tel-01752476⟩

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