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http://hdl.handle.net/10985/11324
Quantitative visualization of swirl and cloud bubbles in Taylor–Couette flow
VAN RUYMBEKE, Bruno; MURAI, Yuichi; TASAKA, Yuji; OISHI, Yoshihiko; GABILLET, Céline; COLIN, Catherine; LATRACHE, Noureddine
We develop a novel method to study the gas phase features in a bubbly Taylor–Couette flow when bubbles are arranged as elevated toroidal strings. The flow is recorded in the front view plane with a highspeed camera for a Reynolds number of 1500 and a global void fraction of 0.14 %. An image processing algorithm is developed to discriminate bubbles accumulated in clouds near the inner cylinder (cloud bubbles) from bubbles trapped in the bulk flow by vortices (swirl bubbles). The analysis of the preferential positions, azimuthal velocities, and equivalent void fraction of clouds and swirl bubbles separately provides a new insight into the dynamics of the bubble’s entrapment.
Fri, 01 Jan 2016 00:00:00 GMThttp://hdl.handle.net/10985/113242016-01-01T00:00:00ZVAN RUYMBEKE, BrunoMURAI, YuichiTASAKA, YujiOISHI, YoshihikoGABILLET, CélineCOLIN, CatherineLATRACHE, NoureddineWe develop a novel method to study the gas phase features in a bubbly Taylor–Couette flow when bubbles are arranged as elevated toroidal strings. The flow is recorded in the front view plane with a highspeed camera for a Reynolds number of 1500 and a global void fraction of 0.14 %. An image processing algorithm is developed to discriminate bubbles accumulated in clouds near the inner cylinder (cloud bubbles) from bubbles trapped in the bulk flow by vortices (swirl bubbles). The analysis of the preferential positions, azimuthal velocities, and equivalent void fraction of clouds and swirl bubbles separately provides a new insight into the dynamics of the bubble’s entrapment.Experimental investigation of bubble induced modifications of a turbulent boundary layer
http://hdl.handle.net/10985/11325
Experimental investigation of bubble induced modifications of a turbulent boundary layer; Caractérisation expérimentale de l’effet de l’injection de bulles dans une couche limite turbulente
ZHANG, Jishen; GABILLET, Céline; CLEMENT, Adrien; BILLARD, Jean-Yves
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 Particle Tracking Velocimetry in vertical plane perpendicular to the upper wall and 1D Laser Doppler Velocimetry technique for longitudinal velocity component. In this study, we focus on an horizontal boundary layer where the Reynolds number, based on the thickness of momentum and external velocity is Re 3976. The air injection panel is located at the upper wall of the tunnel’s test section and it allows to cover the injection of a large range of bubble sizes (from 40 to 300 viscous lengths) as well as varying the void fraction between 0.01% and 0.11%. The results reveal that two flow regimes exist: with the increase of the global air injection, a longitudinal speed deficit is observed in the log zone altogether with a longitudinal speed increase in the sub-viscous layer and a Reynolds stress drop. This is in agreement with a phenomena of aspiration caused by the bubble buoyancy. Beyond a critical bubble size, wake bubbles are found in the flow and contribute to a drop in viscous friction and in turbulent shear stress in the near wall region, this phenomenon could be associated to a blowing effect.; Cette étude a pour objectif de caractériser expérimentalement les effets de l’injection de bulles de tailles intermédiaire (millimétriques), soumises à un fort effet de gravité, sur un écoulement de couche limite turbulente. La configuration expérimentale est celle d’une couche limite horizontale en développement pour un nombre de Reynolds caractéristique, basé sur l’épaisseur de quantité de mouvement et la vitesse externe, Re= 3976. Le système d’injection d’air localisé sur la paroi supérieure du tunnel a permis de faire varier la taille des bulles dans une large gamme (de 40 à 300 longueurs visqueuses), et de faire varier le taux de vide moyen entre 0.01% et 0.11%. Nous avons mesuré la vitesse du liquide dans la zone interne de la couche par Vélocimétrie par Images de Particules en 2D, pour les composantes de vitesse dans le plan vertical et Vélocimétrie par effet Doppler en 1D pour la composante longitudinale. Les résultats montrent l’existence de deux régimes d’écoulement. Avec l’augmentation du débit global d’air injecté, un déficit de vitesse longitudinale se manifeste dans la zone logarithmique, associé à un excès de vitesse longitudinale dans la sous couche visqueuse et une diminution des tensions de Reynolds. Ceci est en accord avec un phénomène d’aspiration dû à la flottabilité induite par les bulles. Au-delà d’une certaine taille de bulles, des bulles de sillage sont présentes dans l’écoulement, contribuant ainsi à une diminution tant du frottement visqueux que du frottement turbulent en très proche paroi, associé à un effet de soufflage.
Fri, 01 Jan 2016 00:00:00 GMThttp://hdl.handle.net/10985/113252016-01-01T00:00:00ZZHANG, JishenGABILLET, CélineCLEMENT, AdrienBILLARD, Jean-YvesTo 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 Particle Tracking Velocimetry in vertical plane perpendicular to the upper wall and 1D Laser Doppler Velocimetry technique for longitudinal velocity component. In this study, we focus on an horizontal boundary layer where the Reynolds number, based on the thickness of momentum and external velocity is Re 3976. The air injection panel is located at the upper wall of the tunnel’s test section and it allows to cover the injection of a large range of bubble sizes (from 40 to 300 viscous lengths) as well as varying the void fraction between 0.01% and 0.11%. The results reveal that two flow regimes exist: with the increase of the global air injection, a longitudinal speed deficit is observed in the log zone altogether with a longitudinal speed increase in the sub-viscous layer and a Reynolds stress drop. This is in agreement with a phenomena of aspiration caused by the bubble buoyancy. Beyond a critical bubble size, wake bubbles are found in the flow and contribute to a drop in viscous friction and in turbulent shear stress in the near wall region, this phenomenon could be associated to a blowing effect.
Cette étude a pour objectif de caractériser expérimentalement les effets de l’injection de bulles de tailles intermédiaire (millimétriques), soumises à un fort effet de gravité, sur un écoulement de couche limite turbulente. La configuration expérimentale est celle d’une couche limite horizontale en développement pour un nombre de Reynolds caractéristique, basé sur l’épaisseur de quantité de mouvement et la vitesse externe, Re= 3976. Le système d’injection d’air localisé sur la paroi supérieure du tunnel a permis de faire varier la taille des bulles dans une large gamme (de 40 à 300 longueurs visqueuses), et de faire varier le taux de vide moyen entre 0.01% et 0.11%. Nous avons mesuré la vitesse du liquide dans la zone interne de la couche par Vélocimétrie par Images de Particules en 2D, pour les composantes de vitesse dans le plan vertical et Vélocimétrie par effet Doppler en 1D pour la composante longitudinale. Les résultats montrent l’existence de deux régimes d’écoulement. Avec l’augmentation du débit global d’air injecté, un déficit de vitesse longitudinale se manifeste dans la zone logarithmique, associé à un excès de vitesse longitudinale dans la sous couche visqueuse et une diminution des tensions de Reynolds. Ceci est en accord avec un phénomène d’aspiration dû à la flottabilité induite par les bulles. Au-delà d’une certaine taille de bulles, des bulles de sillage sont présentes dans l’écoulement, contribuant ainsi à une diminution tant du frottement visqueux que du frottement turbulent en très proche paroi, associé à un effet de soufflage.Experimental Study of the Flow in a Compact Heat Exchanger Channel with Embossed-type Vortex Generators
http://hdl.handle.net/10985/9495
Experimental Study of the Flow in a Compact Heat Exchanger Channel with Embossed-type Vortex Generators
DUPONT, Frédéric; GABILLET, Céline; BOT, Patrick
The isothermal flow in a model channel of plate-fin heat exchanger with periodically arranged embossed-like vortex generators is investigated. Velocity measurements are performed by LDA in the transitional regime (Reynolds number from 1000 up to 5000). Strong longitudinal vortices are observed downstream of each vortex generator. The vortex roll-up process is highlighted by the evolution of the velocity vector field in the cross section of the flow. The modifications of the vortex characteristics after successively encountered generators are investigated. This work shows most of the flow features which are known to produce heat transfer enhancement, and shows that these smooth shaped vortex generators are very promising for enhanced heat exchangers.
Wed, 01 Jan 2003 00:00:00 GMThttp://hdl.handle.net/10985/94952003-01-01T00:00:00ZDUPONT, FrédéricGABILLET, CélineBOT, PatrickThe isothermal flow in a model channel of plate-fin heat exchanger with periodically arranged embossed-like vortex generators is investigated. Velocity measurements are performed by LDA in the transitional regime (Reynolds number from 1000 up to 5000). Strong longitudinal vortices are observed downstream of each vortex generator. The vortex roll-up process is highlighted by the evolution of the velocity vector field in the cross section of the flow. The modifications of the vortex characteristics after successively encountered generators are investigated. This work shows most of the flow features which are known to produce heat transfer enhancement, and shows that these smooth shaped vortex generators are very promising for enhanced heat exchangers.Bubble effect on the structures of weakly turbulent couette taylor flow
http://hdl.handle.net/10985/10307
Bubble effect on the structures of weakly turbulent couette taylor flow
MEHEL, Amine; GABILLET, Céline; DJERIDI, Henda
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.
Sun, 01 Jan 2006 00:00:00 GMThttp://hdl.handle.net/10985/103072006-01-01T00:00:00ZMEHEL, AmineGABILLET, CélineDJERIDI, HendaIn 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.Numerical study of hydrodynamic impact on bubbly water
http://hdl.handle.net/10985/9438
Numerical study of hydrodynamic impact on bubbly water
ELHIMER, Mehdi; EL MALKI ALAOUI, Aboulghit; CROCI, Kilian; GABILLET, Céline; JACQUES, Nicolas
The phenomenon of slamming on a bubbly liquid has many occurrences in marine and costal engineering. However, experimental or numerical data on the effect of the presence of gas bubbles within the liquid on the impact loads are scarce and the related physical mechanisms are poorly understood. The aim of the present paper is to study numerically the relationship between the void volume fraction and the impact loads. For that purpose, numerical simulations of the impact of a cone on bubbly water have been performed using the finite element code ABAQUS/Explicit. The present results show the diminution of the impact loads with the increase of the void fraction. This effect appears to be related to the high compressibility of the liquid-gas mixture.
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/10985/94382015-01-01T00:00:00ZELHIMER, MehdiEL MALKI ALAOUI, AboulghitCROCI, KilianGABILLET, CélineJACQUES, NicolasThe phenomenon of slamming on a bubbly liquid has many occurrences in marine and costal engineering. However, experimental or numerical data on the effect of the presence of gas bubbles within the liquid on the impact loads are scarce and the related physical mechanisms are poorly understood. The aim of the present paper is to study numerically the relationship between the void volume fraction and the impact loads. For that purpose, numerical simulations of the impact of a cone on bubbly water have been performed using the finite element code ABAQUS/Explicit. The present results show the diminution of the impact loads with the increase of the void fraction. This effect appears to be related to the high compressibility of the liquid-gas mixture.Mitigation of underwater explosion effects by bubble curtains : experiments and modelling
http://hdl.handle.net/10985/8696
Mitigation of underwater explosion effects by bubble curtains : experiments and modelling
CROCI, Kilian; ARRIGONI, Michel; BOYCE, P; GABILLET, Céline; GRANDJEAN, Hervé; JACQUES, Nicolas; KERAMPRAN, Steven
Mine fields and UneXploded Ordnances (UXO) become a danger regarding maritime activities. Since UXOs are strongly affected by marine corrosion after decades, they cannot be handled safely. A safe solution to get rid of them would be to explode them in their locations. However, this method generates noise pollution and damaging shock waves. Mitigation of shocks and noises is made possible by the use of a bubble curtain set around the explosive charge. Physical aspects of shock propagation in bubbly flows have been the subject of numerous investigations in the past decades and theoretical models of aerated liquids now reproduce main shock features with acceptable accuracy in the case of a uniform distribution of bubbles of the same size. However, the bubble distribution obtained by air blown in a porous pipe is far to be monodisperse. So the modeling of the interaction of a shock wave with a polydisperse medium still remains a challenge. In the present study, the transmission of a shock wave propagating through a bubble curtain is investigated experimentally on a water filled tank. A microporous pipe, connected to a compressed air supply system and a flowmeter, is placed on the floor in the tank. A dual-tip fiber optical probe is used to measure the gas fraction distribution, bubble rising velocity and bubble size distribution in the curtain. A calibrated shock wave is generated by plate impact, upstream of the bubble curtain, and recorded downstream with a hydrophone. The mitigation of the pressure peak by the bubbly medium is evidenced by recorded pressure signals with and without bubble curtain. Experimental gas fraction profiles and bubble size distributions, measured in the bubble curtains, are finally used as input parameters in the numerical model developed by Grandjean et al. (2011). This numerical model enables prediction of shock wave mitigation and allows calibrating a suitable bubble curtain.
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/10985/86962014-01-01T00:00:00ZCROCI, KilianARRIGONI, MichelBOYCE, PGABILLET, CélineGRANDJEAN, HervéJACQUES, NicolasKERAMPRAN, StevenMine fields and UneXploded Ordnances (UXO) become a danger regarding maritime activities. Since UXOs are strongly affected by marine corrosion after decades, they cannot be handled safely. A safe solution to get rid of them would be to explode them in their locations. However, this method generates noise pollution and damaging shock waves. Mitigation of shocks and noises is made possible by the use of a bubble curtain set around the explosive charge. Physical aspects of shock propagation in bubbly flows have been the subject of numerous investigations in the past decades and theoretical models of aerated liquids now reproduce main shock features with acceptable accuracy in the case of a uniform distribution of bubbles of the same size. However, the bubble distribution obtained by air blown in a porous pipe is far to be monodisperse. So the modeling of the interaction of a shock wave with a polydisperse medium still remains a challenge. In the present study, the transmission of a shock wave propagating through a bubble curtain is investigated experimentally on a water filled tank. A microporous pipe, connected to a compressed air supply system and a flowmeter, is placed on the floor in the tank. A dual-tip fiber optical probe is used to measure the gas fraction distribution, bubble rising velocity and bubble size distribution in the curtain. A calibrated shock wave is generated by plate impact, upstream of the bubble curtain, and recorded downstream with a hydrophone. The mitigation of the pressure peak by the bubbly medium is evidenced by recorded pressure signals with and without bubble curtain. Experimental gas fraction profiles and bubble size distributions, measured in the bubble curtains, are finally used as input parameters in the numerical model developed by Grandjean et al. (2011). This numerical model enables prediction of shock wave mitigation and allows calibrating a suitable bubble curtain.Analysis of the flow pattern modifications in a bubbly Couette-Taylor flow
http://hdl.handle.net/10985/10301
Analysis of the flow pattern modifications in a bubbly Couette-Taylor flow
MEHEL, Amine; GABILLET, Céline; DJERIDI, Henda
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 location and local void fractions both in the vortices cores and in the near wall regions directly influence the axial wavelength. Bubbles trapped in the vortices tend to increase the vorticity and reduce the axial diffusivity. Bubbles near the wall contribute to “shear induced” turbulence depending on the void fraction gradient near the wall and the bubble size.
Mon, 01 Jan 2007 00:00:00 GMThttp://hdl.handle.net/10985/103012007-01-01T00:00:00ZMEHEL, AmineGABILLET, CélineDJERIDI, HendaThe 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 location and local void fractions both in the vortices cores and in the near wall regions directly influence the axial wavelength. Bubbles trapped in the vortices tend to increase the vorticity and reduce the axial diffusivity. Bubbles near the wall contribute to “shear induced” turbulence depending on the void fraction gradient near the wall and the bubble size.Numerical simulations of drag modulation by microbubbles in a turbulent Taylor-Couette flow
http://hdl.handle.net/10985/8695
Numerical simulations of drag modulation by microbubbles in a turbulent Taylor-Couette flow
CHOUIPPE, Agathe; CLIMENT, Eric; LEGENDRE, Dominique; GABILLET, Céline
The aim of our study is to investigate numerically the interaction between a dispersed phase composed of microbubbles and a turbulent Taylor-Couette flow (flow within the gap between two cylinders). We use the Euler-Lagrange approach based on Direct Numerical Simulation of the continuous phase flow equations and a Lagrangian tracking for the dispersed phase. Each bubble trajectory is calculated by integrating the force balance equation accounting for buoyancy, drag, added-mass, pressure gradient, and the lift forces. The numerical method has been adapted in order to take into account the feed-back effect of the dispersed bubbles on the carrying flow. Our approach is based on local volume average of the two-phase Navier-Stokes equations. Local and temporal variations of the bubble concentration and momentum source terms are accounted for in mass and momentum balance equations. A number of reference cases have been tested to validate the modelling approach and its numerical implementation. Then, our previous study of bubble dispersion has been extended to two-way coupling simulations of turbulent Taylor-Couette flows (only inner cylinder is rotating). Modulation of the drag will be discussed for different geometries, Reynolds numbers and bubble sizes. The results show that near-wall turbulent structures are modified by the presence of bubbles.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/10985/86952013-01-01T00:00:00ZCHOUIPPE, AgatheCLIMENT, EricLEGENDRE, DominiqueGABILLET, CélineThe aim of our study is to investigate numerically the interaction between a dispersed phase composed of microbubbles and a turbulent Taylor-Couette flow (flow within the gap between two cylinders). We use the Euler-Lagrange approach based on Direct Numerical Simulation of the continuous phase flow equations and a Lagrangian tracking for the dispersed phase. Each bubble trajectory is calculated by integrating the force balance equation accounting for buoyancy, drag, added-mass, pressure gradient, and the lift forces. The numerical method has been adapted in order to take into account the feed-back effect of the dispersed bubbles on the carrying flow. Our approach is based on local volume average of the two-phase Navier-Stokes equations. Local and temporal variations of the bubble concentration and momentum source terms are accounted for in mass and momentum balance equations. A number of reference cases have been tested to validate the modelling approach and its numerical implementation. Then, our previous study of bubble dispersion has been extended to two-way coupling simulations of turbulent Taylor-Couette flows (only inner cylinder is rotating). Modulation of the drag will be discussed for different geometries, Reynolds numbers and bubble sizes. The results show that near-wall turbulent structures are modified by the presence of bubbles.Time Resolved Two Dimensional X-Ray Densitometry of a Two Phase Flow Downstream of a Ventilated Cavity
http://hdl.handle.net/10985/8674
Time Resolved Two Dimensional X-Ray Densitometry of a Two Phase Flow Downstream of a Ventilated Cavity
MAKIHARJU, Simo A; GABILLET, Céline; PAIK, Bu-Geun; CHANG, Natasha A; PERLIN, Marc; CECCIO, Steven L
To measure the void fraction distribution in gas-liquid flows, a two-dimensional x-ray densitometry system was developed. This system is capable of acquiring a two-dimensional projection with a 225 cm2 area of measurement through 21 cm of water. The images can be acquired at rates on the order of 1 kHz. Common sources of error in x-ray imaging, such as x-ray scatter, image distortion, veiling glare, and beam hardening were considered, and mitigated. The measured average void fraction was compared success fully to that of a phantom target and found to be within 1%. To evaluate the performance of the new system, the flow in and downstream of a ventilated nominally two-dimensional partial cavity was investigated and compared to measurements from dual tip fiber optical probes and high speed video. The measurements were found to have satisfactory agreement for void fractions above 5% of the selected void fraction measurement range.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/10985/86742013-01-01T00:00:00ZMAKIHARJU, Simo AGABILLET, CélinePAIK, Bu-GeunCHANG, Natasha APERLIN, MarcCECCIO, Steven LTo measure the void fraction distribution in gas-liquid flows, a two-dimensional x-ray densitometry system was developed. This system is capable of acquiring a two-dimensional projection with a 225 cm2 area of measurement through 21 cm of water. The images can be acquired at rates on the order of 1 kHz. Common sources of error in x-ray imaging, such as x-ray scatter, image distortion, veiling glare, and beam hardening were considered, and mitigated. The measured average void fraction was compared success fully to that of a phantom target and found to be within 1%. To evaluate the performance of the new system, the flow in and downstream of a ventilated nominally two-dimensional partial cavity was investigated and compared to measurements from dual tip fiber optical probes and high speed video. The measurements were found to have satisfactory agreement for void fractions above 5% of the selected void fraction measurement range.Two-phase Couette–Taylor flow: Arrangement of the dispersed phase and effects on the flow structures
http://hdl.handle.net/10985/10302
Two-phase Couette–Taylor flow: Arrangement of the dispersed phase and effects on the flow structures
DJERIDI, Henda; GABILLET, Céline; BILLARD, Jean-Yves
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.
Thu, 01 Jan 2004 00:00:00 GMThttp://hdl.handle.net/10985/103022004-01-01T00:00:00ZDJERIDI, HendaGABILLET, CélineBILLARD, Jean-YvesThis 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.