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Étude locale et expérimentale des 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 (both PIV and µ-PIV) and fast camera visualization. Bubbles and drops were experimentally studied starting from their formation, the rising and up to their coalescence and fragmentation. Bubble formation in micro-mixers was also investigated and characterized by measuring the liquid velocity fields. Different parameters, such as the shear rate, the geometry of the micro-mixer, the flow rates or the physical properties were tested to develop correlations of power-law kind. The deformation of a liquid-liquid interface due to the passage of an inclusion was investigated by original experiments in order to observe and describe the dynamics of the phenomenon, to define the reliable dimensionless numbers and also to highlight several interfacial instabilities. The Weissenberg effect was also studied at different scales in various non-Newtonian fluids in comparison with Newtonian fluids to understand the amplification phenomena under the combining effects of instability and normal forces. Finally, the flow around an isolated solid inclusion was characterized by performing the measurements of velocity fields in viscoelastic and shear-thinning fluids. These results were used to confirm the viscoelastic origin of the negative wake behind the solid sphere and to model its characteristics
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Submitted on : Thursday, March 29, 2018 - 2:04:14 PM
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  • HAL Id : tel-01753004, version 1



Nicolas Dietrich. Étude locale et expérimentale des phénomènes interfaciaux. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL078N⟩. ⟨tel-01753004⟩



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