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Papers by Dominique Legendre

Research paper thumbnail of Reversal of the lift and the torque acting on an oblate spheroidal bubble in a linear shear flow.European

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Research paper thumbnail of Détermination de la fréquence de collision entre bulles et particules dans les procédés de flottation

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Research paper thumbnail of Numerical and experimental studies of bubbles dispersion and bubbles induced drag modulation in a Taylor Vortex flow

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Research paper thumbnail of Effects of turbulence on a single spherical bubble

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Research paper thumbnail of Interactions between a turbulent flow and a spherical bubble

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Research paper thumbnail of Simulation d'ecoulements diphasiques incompressibles à bulles et à gouttes

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Research paper thumbnail of Approche numérique du procédé de broyage

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Research paper thumbnail of The interaction between two spherical bubbles rising side by side in a viscous liquid

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Research paper thumbnail of Numerical approach of grinding process in a stirred media mill

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Research paper thumbnail of The relation between the force experienced by a drop and that experienced by a solid sphere in the low-but-finite Reynolds number regime

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Research paper thumbnail of Particle Dispersion and Preferential Concentration Dependance on Turbulent Reynolds Number from Direct and Large Eddy Simulations of Isotropic Homogeneous Turbulence

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Research paper thumbnail of Etude numérique du mouvement de gouttes en canal chicané

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Research paper thumbnail of Two-phase flow modeling of breaking waves without interface reconstruction

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Research paper thumbnail of Bouncing drops in water

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Research paper thumbnail of Motion and shape of long bubbles in small tube at low Re-number

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Research paper thumbnail of On the collision between small solid particules and spherical bubbles

The capture of solid particles by bubbles is present in many processes in mining industries, wate... more The capture of solid particles by bubbles is present in many processes in mining industries, water purification. An overall efficiency is usually defined as the ratio between the number of particles captured by a bubble and the number of particles located in the volume swept by the bubble. The aim of this work is to consider the collision event and more precisely the effect of the bubble contamination on the collision efficiency. For this purpose, this study focuses on the collision mechanism between a spherical bubble and small particles when particles are small enough to follow the streamlines of the flow generated by the bubble motion. This situation corresponds to the one classically encountered in a lot of flotation processes. This study is based on Direct Numerical Simulation (DNS) and analytical justifications. Numerical results are obtained for a wide range of bubble Reynolds numbers (based on bubble diameter db) and for different angles of contamination. The collision effic...

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Research paper thumbnail of Interaction between two spherical bubbles rising in a liquid

The main goal of the present study is to provide a complete description of the interaction betwee... more The main goal of the present study is to provide a complete description of the interaction between two bubbles for moderate bubble Reynolds number (20

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Research paper thumbnail of Liquid velocity fluctuations induced by large-Reynolds-number rising bubbles

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Research paper thumbnail of Fluctuations de la vitesse du liquide dans un nuage de bulles homogène

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Research paper thumbnail of The motion of a clean bubble confined between two vertical walls

In nature, as well as in many engineering applications, the effects of confining walls on bubbly ... more In nature, as well as in many engineering applications, the effects of confining walls on bubbly flows play an important role. Problems of practical interest where this situation occurs are such as underground water wells and naturally fractured oil reservoirs. Most fundamental studies do not include the effects of walls. The confinement effect on the drag over a bubble was investigated both experimentally and numerically. The experiments were performed with non polar liquids such that the bubble surface could be considered clean. Single bubble experiments and numerical simulations were performed for different Reynolds numbers and dimensionless distances between walls. It was found that the effect of confinement is very strong: the drag can be as much as two times that of a free rising bubble. The comparison between the simulations, performed with the JADIM code, showed good agreement with the experimental results. Both numerical and experimental drag coeficients were found to depen...

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Research paper thumbnail of Reversal of the lift and the torque acting on an oblate spheroidal bubble in a linear shear flow.European

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Research paper thumbnail of Détermination de la fréquence de collision entre bulles et particules dans les procédés de flottation

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Numerical and experimental studies of bubbles dispersion and bubbles induced drag modulation in a Taylor Vortex flow

ABSTRACT

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Research paper thumbnail of Effects of turbulence on a single spherical bubble

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Research paper thumbnail of Interactions between a turbulent flow and a spherical bubble

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Research paper thumbnail of Simulation d'ecoulements diphasiques incompressibles à bulles et à gouttes

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Research paper thumbnail of Approche numérique du procédé de broyage

ABSTRACT

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Research paper thumbnail of The interaction between two spherical bubbles rising side by side in a viscous liquid

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Research paper thumbnail of Numerical approach of grinding process in a stirred media mill

ABSTRACT

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Research paper thumbnail of The relation between the force experienced by a drop and that experienced by a solid sphere in the low-but-finite Reynolds number regime

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Research paper thumbnail of Particle Dispersion and Preferential Concentration Dependance on Turbulent Reynolds Number from Direct and Large Eddy Simulations of Isotropic Homogeneous Turbulence

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Research paper thumbnail of Etude numérique du mouvement de gouttes en canal chicané

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Research paper thumbnail of Two-phase flow modeling of breaking waves without interface reconstruction

ABSTRACT

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Research paper thumbnail of Bouncing drops in water

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Research paper thumbnail of Motion and shape of long bubbles in small tube at low Re-number

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Research paper thumbnail of On the collision between small solid particules and spherical bubbles

The capture of solid particles by bubbles is present in many processes in mining industries, wate... more The capture of solid particles by bubbles is present in many processes in mining industries, water purification. An overall efficiency is usually defined as the ratio between the number of particles captured by a bubble and the number of particles located in the volume swept by the bubble. The aim of this work is to consider the collision event and more precisely the effect of the bubble contamination on the collision efficiency. For this purpose, this study focuses on the collision mechanism between a spherical bubble and small particles when particles are small enough to follow the streamlines of the flow generated by the bubble motion. This situation corresponds to the one classically encountered in a lot of flotation processes. This study is based on Direct Numerical Simulation (DNS) and analytical justifications. Numerical results are obtained for a wide range of bubble Reynolds numbers (based on bubble diameter db) and for different angles of contamination. The collision effic...

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Research paper thumbnail of Interaction between two spherical bubbles rising in a liquid

The main goal of the present study is to provide a complete description of the interaction betwee... more The main goal of the present study is to provide a complete description of the interaction between two bubbles for moderate bubble Reynolds number (20

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Research paper thumbnail of Liquid velocity fluctuations induced by large-Reynolds-number rising bubbles

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Research paper thumbnail of Fluctuations de la vitesse du liquide dans un nuage de bulles homogène

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Research paper thumbnail of The motion of a clean bubble confined between two vertical walls

In nature, as well as in many engineering applications, the effects of confining walls on bubbly ... more In nature, as well as in many engineering applications, the effects of confining walls on bubbly flows play an important role. Problems of practical interest where this situation occurs are such as underground water wells and naturally fractured oil reservoirs. Most fundamental studies do not include the effects of walls. The confinement effect on the drag over a bubble was investigated both experimentally and numerically. The experiments were performed with non polar liquids such that the bubble surface could be considered clean. Single bubble experiments and numerical simulations were performed for different Reynolds numbers and dimensionless distances between walls. It was found that the effect of confinement is very strong: the drag can be as much as two times that of a free rising bubble. The comparison between the simulations, performed with the JADIM code, showed good agreement with the experimental results. Both numerical and experimental drag coeficients were found to depen...

Bookmarks Related papers MentionsView impact

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