Contribution expérimentale à l'amélioration des modèles de transition de régime en écoulement diphasique horizontal.

Abstract : Several horizontal water-air two-phase adiabatic flows (dispersed bubbly flows and intermittent flows)and their axial evolutions have been studied in the METERO experiment which is consisted of ahorizontal circular test section with an internal diameter of 100 mm. Different measurement techniqueshave been improved and utilized to measure the flow characteristics in order to bring a localdescription and axial evolution of the flows. The responsible physical mechanisms of the flow regimesand their transitions, particularly the competition between turbulent force and buoyancy force havebeen explained. The differences between dispersed bubbly flows and intermittent flows have beenhighlighted and the physical process at the origin of these differences has been explained. Two newdimensionless flow regime maps have been proposed: the first one brings an improvement to therepresentation of Taitel & Dukler (1976) and proposes new transition criteria. The second novel maptakes into account the effects of turbulent and buoyancy forces and the void fraction.
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Onur Can Ozturk. Contribution expérimentale à l'amélioration des modèles de transition de régime en écoulement diphasique horizontal.. Mécanique des fluides [physics.class-ph]. Université Grenoble Alpes, 2013. Français. ⟨NNT : 2013GRENI113⟩. ⟨tel-02145707⟩

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