The Experts below are selected from a list of 108 Experts worldwide ranked by ideXlab platform
Yves Gagne - One of the best experts on this subject based on the ideXlab platform.
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Acceleration statistics of inertial particles in turbulent flow
European Physical Journal B: Condensed Matter and Complex Systems, 2008Co-Authors: Muhammad Nauman Qureshi, Christophe Baudet, Alain H. Cartellier, Yves Gagne, Unai Arrieta, Mickaël BourgoinAbstract:Turbulent Transport of Material inclusions plays an important role in many natural and industrial situations. Being able to accurately model and predict the dynamics of dispersed particles Transported by a turbulent carrier flow, remains a challenge. One critical and difficult point is to develop models which correctly describe the dynamics of particles over a wide range of sizes and densities. Our measurements show that acceleration statistics of particles dispersed in a turbulent flow do exhibit specific, and so far unpredicted, size and density effects and that they preserve an extremely robust turbulent signature with lognormal fluctuations, regardless of particles size and density. This has important consequences in terms of modeling for the turbulent Transport of dispersed inclusions.
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Turbulent Transport of Material particles: an experimental study of finite size effects.
Physical review letters, 2007Co-Authors: Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We present experimental Lagrangian statistics of finite sized, neutrally bouyant, particles Transported in an isotropic turbulent flow. The particle's diameter is varied over turbulent inertial scales. Finite size effects are shown not to be trivially related to velocity intermittency. The global shape of the particle's acceleration probability density functions is not found to depend significantly on its size while the particle's acceleration variance decreases as it becomes larger in quantitative agreement with the classical k(-7/3) scaling for the spectrum of Eulerian pressure fluctuations in the carrier flow.
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Experimental investigation of turbulent Transport of Material particles
2007Co-Authors: Muhammad Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We report measurements of Lagrangian velocity and acceleration statistics of particles Transported in a turbulent flow obtained with an acoustic Doppler velocimelly technique. We consider a homogeneous isotropic grid turbulence generated in a wind tunnel. As a first step we study isolated particles dynamics with a particular focus on the influence of particles finite size on their response to the turbulence forcing. As particles we use neutrally buoyant soap bubbles inflated with helium. The size of the particles can be adjusted from 1.5 mm to 6 mm, corresponding to inertial range scales. We show that the response time of the particles to the turbulence forcing increases with their size. We analyze our data in the frame of two times stochastic models, and show that the cut-of! time scale in the Lagrangian energy spectrum of the particles dynamics has a dependence on their diameter consistent with a lowpass .filtering of the turbulent cascade by the particles finite size.
Mickaël Bourgoin - One of the best experts on this subject based on the ideXlab platform.
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Turbulent Transport of finite sized Material particles
Journal of Physics: Conference Series, 2011Co-Authors: Mickaël Bourgoin, Nauman M. Qureshi, Christophe Baudet, Alain H. Cartellier, Cartellier GagneAbstract:Turbulent Transport of Material inclusions plays an important role in many natural and industrial situations. In the present study, we report an exhaustive experimental investigation of Lagrangian dynamics of Material particles in a turbulent air flow, over a wide range of sizes and densities. For fixed carrier flow conditions, we find that (i) velocity statistics are not affected by particles inertia ; (ii) acceleration statistics have a very robust signature, where only acceleration variance is affected by inertia ; (iii) inertial particles always have an intermittent dynamics ; (iv) intermittency signature depends on particles inertia ; (v) particles actual response time to turbulent forcing remains essentially of the order of the carrier flow dissipation time rather than any particles dependent time (as the Stokes time for instance). These observations are in contrast with usual predictions from Stokesian models for point particles.
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Acceleration statistics of inertial particles in turbulent flow
European Physical Journal B: Condensed Matter and Complex Systems, 2008Co-Authors: Muhammad Nauman Qureshi, Christophe Baudet, Alain H. Cartellier, Yves Gagne, Unai Arrieta, Mickaël BourgoinAbstract:Turbulent Transport of Material inclusions plays an important role in many natural and industrial situations. Being able to accurately model and predict the dynamics of dispersed particles Transported by a turbulent carrier flow, remains a challenge. One critical and difficult point is to develop models which correctly describe the dynamics of particles over a wide range of sizes and densities. Our measurements show that acceleration statistics of particles dispersed in a turbulent flow do exhibit specific, and so far unpredicted, size and density effects and that they preserve an extremely robust turbulent signature with lognormal fluctuations, regardless of particles size and density. This has important consequences in terms of modeling for the turbulent Transport of dispersed inclusions.
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Turbulent Transport of Material particles: an experimental study of finite size effects.
Physical review letters, 2007Co-Authors: Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We present experimental Lagrangian statistics of finite sized, neutrally bouyant, particles Transported in an isotropic turbulent flow. The particle's diameter is varied over turbulent inertial scales. Finite size effects are shown not to be trivially related to velocity intermittency. The global shape of the particle's acceleration probability density functions is not found to depend significantly on its size while the particle's acceleration variance decreases as it becomes larger in quantitative agreement with the classical k(-7/3) scaling for the spectrum of Eulerian pressure fluctuations in the carrier flow.
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Experimental investigation of turbulent Transport of Material particles
2007Co-Authors: Muhammad Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We report measurements of Lagrangian velocity and acceleration statistics of particles Transported in a turbulent flow obtained with an acoustic Doppler velocimelly technique. We consider a homogeneous isotropic grid turbulence generated in a wind tunnel. As a first step we study isolated particles dynamics with a particular focus on the influence of particles finite size on their response to the turbulence forcing. As particles we use neutrally buoyant soap bubbles inflated with helium. The size of the particles can be adjusted from 1.5 mm to 6 mm, corresponding to inertial range scales. We show that the response time of the particles to the turbulence forcing increases with their size. We analyze our data in the frame of two times stochastic models, and show that the cut-of! time scale in the Lagrangian energy spectrum of the particles dynamics has a dependence on their diameter consistent with a lowpass .filtering of the turbulent cascade by the particles finite size.
Alain H. Cartellier - One of the best experts on this subject based on the ideXlab platform.
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Turbulent Transport of finite sized Material particles
Journal of Physics: Conference Series, 2011Co-Authors: Mickaël Bourgoin, Nauman M. Qureshi, Christophe Baudet, Alain H. Cartellier, Cartellier GagneAbstract:Turbulent Transport of Material inclusions plays an important role in many natural and industrial situations. In the present study, we report an exhaustive experimental investigation of Lagrangian dynamics of Material particles in a turbulent air flow, over a wide range of sizes and densities. For fixed carrier flow conditions, we find that (i) velocity statistics are not affected by particles inertia ; (ii) acceleration statistics have a very robust signature, where only acceleration variance is affected by inertia ; (iii) inertial particles always have an intermittent dynamics ; (iv) intermittency signature depends on particles inertia ; (v) particles actual response time to turbulent forcing remains essentially of the order of the carrier flow dissipation time rather than any particles dependent time (as the Stokes time for instance). These observations are in contrast with usual predictions from Stokesian models for point particles.
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Acceleration statistics of inertial particles in turbulent flow
European Physical Journal B: Condensed Matter and Complex Systems, 2008Co-Authors: Muhammad Nauman Qureshi, Christophe Baudet, Alain H. Cartellier, Yves Gagne, Unai Arrieta, Mickaël BourgoinAbstract:Turbulent Transport of Material inclusions plays an important role in many natural and industrial situations. Being able to accurately model and predict the dynamics of dispersed particles Transported by a turbulent carrier flow, remains a challenge. One critical and difficult point is to develop models which correctly describe the dynamics of particles over a wide range of sizes and densities. Our measurements show that acceleration statistics of particles dispersed in a turbulent flow do exhibit specific, and so far unpredicted, size and density effects and that they preserve an extremely robust turbulent signature with lognormal fluctuations, regardless of particles size and density. This has important consequences in terms of modeling for the turbulent Transport of dispersed inclusions.
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Turbulent Transport of Material particles: an experimental study of finite size effects.
Physical review letters, 2007Co-Authors: Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We present experimental Lagrangian statistics of finite sized, neutrally bouyant, particles Transported in an isotropic turbulent flow. The particle's diameter is varied over turbulent inertial scales. Finite size effects are shown not to be trivially related to velocity intermittency. The global shape of the particle's acceleration probability density functions is not found to depend significantly on its size while the particle's acceleration variance decreases as it becomes larger in quantitative agreement with the classical k(-7/3) scaling for the spectrum of Eulerian pressure fluctuations in the carrier flow.
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Experimental investigation of turbulent Transport of Material particles
2007Co-Authors: Muhammad Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We report measurements of Lagrangian velocity and acceleration statistics of particles Transported in a turbulent flow obtained with an acoustic Doppler velocimelly technique. We consider a homogeneous isotropic grid turbulence generated in a wind tunnel. As a first step we study isolated particles dynamics with a particular focus on the influence of particles finite size on their response to the turbulence forcing. As particles we use neutrally buoyant soap bubbles inflated with helium. The size of the particles can be adjusted from 1.5 mm to 6 mm, corresponding to inertial range scales. We show that the response time of the particles to the turbulence forcing increases with their size. We analyze our data in the frame of two times stochastic models, and show that the cut-of! time scale in the Lagrangian energy spectrum of the particles dynamics has a dependence on their diameter consistent with a lowpass .filtering of the turbulent cascade by the particles finite size.
Christophe Baudet - One of the best experts on this subject based on the ideXlab platform.
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Turbulent Transport of finite sized Material particles
Journal of Physics: Conference Series, 2011Co-Authors: Mickaël Bourgoin, Nauman M. Qureshi, Christophe Baudet, Alain H. Cartellier, Cartellier GagneAbstract:Turbulent Transport of Material inclusions plays an important role in many natural and industrial situations. In the present study, we report an exhaustive experimental investigation of Lagrangian dynamics of Material particles in a turbulent air flow, over a wide range of sizes and densities. For fixed carrier flow conditions, we find that (i) velocity statistics are not affected by particles inertia ; (ii) acceleration statistics have a very robust signature, where only acceleration variance is affected by inertia ; (iii) inertial particles always have an intermittent dynamics ; (iv) intermittency signature depends on particles inertia ; (v) particles actual response time to turbulent forcing remains essentially of the order of the carrier flow dissipation time rather than any particles dependent time (as the Stokes time for instance). These observations are in contrast with usual predictions from Stokesian models for point particles.
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Acceleration statistics of inertial particles in turbulent flow
European Physical Journal B: Condensed Matter and Complex Systems, 2008Co-Authors: Muhammad Nauman Qureshi, Christophe Baudet, Alain H. Cartellier, Yves Gagne, Unai Arrieta, Mickaël BourgoinAbstract:Turbulent Transport of Material inclusions plays an important role in many natural and industrial situations. Being able to accurately model and predict the dynamics of dispersed particles Transported by a turbulent carrier flow, remains a challenge. One critical and difficult point is to develop models which correctly describe the dynamics of particles over a wide range of sizes and densities. Our measurements show that acceleration statistics of particles dispersed in a turbulent flow do exhibit specific, and so far unpredicted, size and density effects and that they preserve an extremely robust turbulent signature with lognormal fluctuations, regardless of particles size and density. This has important consequences in terms of modeling for the turbulent Transport of dispersed inclusions.
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Turbulent Transport of Material particles: an experimental study of finite size effects.
Physical review letters, 2007Co-Authors: Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We present experimental Lagrangian statistics of finite sized, neutrally bouyant, particles Transported in an isotropic turbulent flow. The particle's diameter is varied over turbulent inertial scales. Finite size effects are shown not to be trivially related to velocity intermittency. The global shape of the particle's acceleration probability density functions is not found to depend significantly on its size while the particle's acceleration variance decreases as it becomes larger in quantitative agreement with the classical k(-7/3) scaling for the spectrum of Eulerian pressure fluctuations in the carrier flow.
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Experimental investigation of turbulent Transport of Material particles
2007Co-Authors: Muhammad Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We report measurements of Lagrangian velocity and acceleration statistics of particles Transported in a turbulent flow obtained with an acoustic Doppler velocimelly technique. We consider a homogeneous isotropic grid turbulence generated in a wind tunnel. As a first step we study isolated particles dynamics with a particular focus on the influence of particles finite size on their response to the turbulence forcing. As particles we use neutrally buoyant soap bubbles inflated with helium. The size of the particles can be adjusted from 1.5 mm to 6 mm, corresponding to inertial range scales. We show that the response time of the particles to the turbulence forcing increases with their size. We analyze our data in the frame of two times stochastic models, and show that the cut-of! time scale in the Lagrangian energy spectrum of the particles dynamics has a dependence on their diameter consistent with a lowpass .filtering of the turbulent cascade by the particles finite size.
Nauman Qureshi - One of the best experts on this subject based on the ideXlab platform.
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Turbulent Transport of Material particles: an experimental study of finite size effects.
Physical review letters, 2007Co-Authors: Nauman Qureshi, Mickaël Bourgoin, Christophe Baudet, Alain H. Cartellier, Yves GagneAbstract:We present experimental Lagrangian statistics of finite sized, neutrally bouyant, particles Transported in an isotropic turbulent flow. The particle's diameter is varied over turbulent inertial scales. Finite size effects are shown not to be trivially related to velocity intermittency. The global shape of the particle's acceleration probability density functions is not found to depend significantly on its size while the particle's acceleration variance decreases as it becomes larger in quantitative agreement with the classical k(-7/3) scaling for the spectrum of Eulerian pressure fluctuations in the carrier flow.
