Dominique Legendre - Academia.edu (original) (raw)
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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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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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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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ABSTRACT
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ABSTRACT
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ABSTRACT
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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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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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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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