Two-phase Couette–Taylor flow: Arrangement of the dispersed phase and effects on the flow structures
Article dans une revue avec comité de lecture
JournalPhysics of Fluids
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 the outer cylinder is immobilized. In this experiment, the turbulent structures take place progressively. The noncondensable dispersed phase ~air! is introduced either by ventilation, generated by agitation of a free surface situated at the top of the gap between the two cylinders. The condensable dispersed phase is generated by cavitation due to a drop in pressure. Comparisons are made between the single phase flow patterns and those observed in ventilated or cavitating flow. Two particular arrangements of the dispersed phase are experimentally evident, according to the Reynolds number of the flow. For low Reynolds numbers, bubbles are trapped in the core of the Taylor cells, whereas they migrate to the outflow regions near the inner cylinder for higher Reynolds numbers. Assessment of the forces applied to the bubbles and computation of their equilibrium position can act as a base in describing the bubble capture. When bubbles are located near the wall in the outflow region, it is found that the three first instabilities are strongly influenced by the dispersed phase. The cavitating flow is also characterized by an earlier appearance of the third instability.
Fichier(s) constituant cette publication
- Article Principal
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
Coherent and turbulent process analysis effects of a longitudinal vortex on boundary layer detachment on a NACA0015 foil Article dans une revue avec comité de lecturePROTHIN, 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 Article dans une revue avec comité de lecturePROTHIN, Sébastien; BILLARD, Jean-Yves; DJERIDI, Henda (Springer Verlag (Germany), 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 ...
Thickness effect of NACA foils on hydrodynamic global parameters, boundary layer states and stall establishment Article dans une revue avec comité de lectureSARRAF, 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 ...
Communication avec acteZHANG, Jishen; GABILLET, Céline; CLEMENT, Adrien; BILLARD, Jean-Yves (2016)To investigate the effect of intermediate sized bubble injection into a turbulent boundary layer under a strong gravity effect, we measure the velocity field of two-phase flow in a horizontal cavitation tunnel with 2D ...
Article dans une revue avec comité de lectureMEHEL, Amine; GABILLET, Céline; DJERIDI, Henda (American Society of Mechanical Engineers, 2006)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 ...