Bubble effect on the structures of weakly turbulent couette taylor flow
TypeArticles dans des revues avec comité de lecture
In industrial applications, rotating flows have been recognized to enhance mixing and transfer properties. Moreover, bubbly flows are also used to improve transfers. Therefore, it is interesting to study the effects of the dispersed phase on the structure of a Couette Taylor flow. Experiments are conducted for the quasi-periodic (Ta=780) and the weakly turbulent (Ta=1000) flow regimes. Bubbles (0.035 times as small as the gap) are generated by agitation of the upper free surface (ventilated flow). Larger bubbles (0.15 times as small as the gap) are generated by injection at the bottom of the apparatus and by applying a pressure drop (gaseous-cavitating flow). Void fraction, bubble size and velocity, as well as axial and azimuthal velocity components of the liquid are investigated. The bubble location in the gap clearly depends on the bubble size. For alpha>0.1%, there is evidence of bubble induced modifications of axial transfers and wall shear stress, the observed trends being different according to the bubble location in the gap.
Files in this item
Showing items related by title, author, creator and subject.
MEHEL, Amine; GABILLET, Céline; DJERIDI, Henda (2007)The aim of this Brief Communication is to discuss the bubble effect on the Couette-Taylor flow patterns in the transition from laminar to turbulent flow, especially in the weakly turbulent regime. It is shown that bubble ...
Two-phase Couette–Taylor flow: Arrangement of the dispersed phase and effects on the flow structures DJERIDI, Henda; GABILLET, Céline; BILLARD, Jean-Yves (AIP, 2004)This study investigates the mutual interactions between a continuous and a dispersed phase~noncondensable or condensable! in the well-known Couette–Taylor flow between two concentric cylinders at low Reynolds numbers, where ...
Thickness effect of NACA foils on hydrodynamic global parameters, boundary layer states and stall establishment SARRAF, Christophe; DJERIDI, Henda; PROTHIN, Sébastien; BILLARD, Jean-Yves (Elsevier, 2010)The present study investigates experimentally the hydrodynamic behavior of 2D NACA (15, 25, 35%) symmetric hydrofoils at Reynolds number 0.5 106 . A particular attention is paid on the hysteretic behavior at static stall ...
Coherent and turbulent process analysis effects of a longitudinal vortex on boundary layer detachment on a NACA0015 foil PROTHIN, Sébastien; DJERIDI, Henda; BILLARD, Jean-Yves (Elsevier, 2013)In this paper, the influence of a single tip vortex on boundary layer detachment is studied. This study offers a preliminary approach in order to better understand the interaction between a propeller hub vortex and the ...
Image processing using proper orthogonal and dynamic mode decompositions for the study of cavitation developing on a NACA0015 foil PROTHIN, Sébastien; BILLARD, Jean-Yves; DJERIDI, Henda (Springer, 2016)The purpose of the present study is to get a better understanding of the hydrodynamic instabilities of sheet cavities which develop along solid walls. The main objective is to highlight the spatial and temporal behavior ...