Etude expérimentale du mouvement de bulles en essaim : application à la simulation numérique de colonnes à bulles

Abstract : Both experimental and numerical studies have been performed in aIder to highlight the influence of the bubbles density on the drag law. Important results concerning the relative velocity of bubbles in a swarm have been obtained thanks to laser Doppler velocimetry and optical probe measurements in a pure water / air bubble column. ln particular, it has been shawn that the relative velocity decreases with the local void fraction up to a critical value of 15 % and increases beyond. These evolutions result from a competition between various phenomena, such as turbulence, hindrance and wake acceleration effects. Based on these conclusions, a drag correlation was obtained and tested in a Computational Fluid Dynamics (CFD) code. The significance of the drag law formulation has been demonstrated, especially for the correct description of the transition between the flow regimes of a bubble column and for the accurate prediction of the liquid velocity profiles measured
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Marie Simonnet. Etude expérimentale du mouvement de bulles en essaim : application à la simulation numérique de colonnes à bulles. Autre. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL066N⟩. ⟨tel-01752499⟩

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