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Etude de la dynamique des bulles infinies : application à l'étude de la vidange et du remplissage de réservoir

Abstract : The object of this thesis is a theoretical and experimental study of .lling and draining process of tanks. The .rst part deals with the experimental study of the draining of vertical tubes of di.erent cross sections by long bubbles. Several scaling laws for the dynamic of this bubble are found : in the high-Reynolds number domain, the perimeter of the normal cross section is shown to be the relevant lenght for bubble dynamic. In the low-Reynolds number range, the relevant square lenght is the area of the normal cross section. Theoretically, a local approach, based on the structure of the .ow at the stagnation point does account for the behaviors observed. The second part is dedicated to the study of .lling and draining time to reach the equilibrium state. We show experimentally that long bubble dynamic is the relevant phenomenon for this two con.gurations. Periodic emission of bubbles which occurs during .lling and draining process is studied in the third part. In case of draining process, the importance of the compressibility of the air pocket in the tank is shown : this phenomenon is similar to the "Gluglug" of a draining bottle. In the .lling case, Physical laws describing periodic emission of bubbles shows signi.cant di.erences exist between the two con.gurations.
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Submitted on : Wednesday, February 22, 2006 - 11:15:50 AM
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Pierre Héraud. Etude de la dynamique des bulles infinies : application à l'étude de la vidange et du remplissage de réservoir. Dynamique des Fluides [physics.flu-dyn]. Université de Provence - Aix-Marseille I, 2002. Français. ⟨tel-00011664⟩

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