Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization

An experimental study of the solid phase dynamics in a three-phase fluidized bed reactor using heavy and light particles is carried out. A radioactive particle tracking technique is employed to obtain extended time series of the tracer path. The tracer has the same properties as the rest of the part...

Descripción completa

Detalles Bibliográficos
Autores principales: Cassanello, M., Larachi, F., Marie, M.-N., Guy, C., Chaouki, J.
Formato: JOUR
Materias:
Dynamics
Fluidization
Three-Phase
Axial flow
Chaos theory
Chemical reactors
Flow of solids
Fluidized beds
Particle beam tracking
Radioactive tracers
Time series analysis
Trace analysis
Transition flow
Turbulence
Fluidized bed reactors
Solid phase dynamics
Three phase fluidization
Tracer path
Fluid dynamics
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08885885_v34_n9_p2971_Cassanello
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08885885_v34_n9_p2971_Cassanello
record_format dspace
spelling todo:paper_08885885_v34_n9_p2971_Cassanello2023-10-03T15:41:02Z Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization Cassanello, M. Larachi, F. Marie, M.-N. Guy, C. Chaouki, J. Dynamics Fluidization Three-Phase Axial flow Chaos theory Chemical reactors Flow of solids Fluidization Fluidized beds Particle beam tracking Radioactive tracers Time series analysis Trace analysis Transition flow Turbulence Fluidized bed reactors Solid phase dynamics Three phase fluidization Tracer path Fluid dynamics An experimental study of the solid phase dynamics in a three-phase fluidized bed reactor using heavy and light particles is carried out. A radioactive particle tracking technique is employed to obtain extended time series of the tracer path. The tracer has the same properties as the rest of the particles in the bed. A rescaled range analysis is applied to time series of the fluctuating velocities to investigate the features of solid phase turbulence. It is found that turbulence is anisotropic. In the axial direction, the correlations between the fluctuating velocities are persistent in time, indicating a superdispersive axial dispersion of the solids. Hence a constant axial dispersion coefficient, which is traditionally used in these reactors to represent the solid phase turbulence, only constitutes a lumped parameter hardly extrapolable to different operating conditions, different systems, and different geometries. The tracer path is also analyzed according to the theory of deterministic chaos. It is found that the solids motion is chaotic. An increase in the gas flow rate increases the values of the parameters that quantify the chaotic behavior of the solids motion. This analysis is found to constitute a promising tool to determine flow regime transitions. © 1995, American Chemical Society. All rights reserved. Fil:Cassanello, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08885885_v34_n9_p2971_Cassanello
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Dynamics
Fluidization
Three-Phase
Axial flow
Chaos theory
Chemical reactors
Flow of solids
Fluidization
Fluidized beds
Particle beam tracking
Radioactive tracers
Time series analysis
Trace analysis
Transition flow
Turbulence
Fluidized bed reactors
Solid phase dynamics
Three phase fluidization
Tracer path
Fluid dynamics
spellingShingle Dynamics
Fluidization
Three-Phase
Axial flow
Chaos theory
Chemical reactors
Flow of solids
Fluidization
Fluidized beds
Particle beam tracking
Radioactive tracers
Time series analysis
Trace analysis
Transition flow
Turbulence
Fluidized bed reactors
Solid phase dynamics
Three phase fluidization
Tracer path
Fluid dynamics
Cassanello, M.
Larachi, F.
Marie, M.-N.
Guy, C.
Chaouki, J.
Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization
topic_facet Dynamics
Fluidization
Three-Phase
Axial flow
Chaos theory
Chemical reactors
Flow of solids
Fluidization
Fluidized beds
Particle beam tracking
Radioactive tracers
Time series analysis
Trace analysis
Transition flow
Turbulence
Fluidized bed reactors
Solid phase dynamics
Three phase fluidization
Tracer path
Fluid dynamics
description An experimental study of the solid phase dynamics in a three-phase fluidized bed reactor using heavy and light particles is carried out. A radioactive particle tracking technique is employed to obtain extended time series of the tracer path. The tracer has the same properties as the rest of the particles in the bed. A rescaled range analysis is applied to time series of the fluctuating velocities to investigate the features of solid phase turbulence. It is found that turbulence is anisotropic. In the axial direction, the correlations between the fluctuating velocities are persistent in time, indicating a superdispersive axial dispersion of the solids. Hence a constant axial dispersion coefficient, which is traditionally used in these reactors to represent the solid phase turbulence, only constitutes a lumped parameter hardly extrapolable to different operating conditions, different systems, and different geometries. The tracer path is also analyzed according to the theory of deterministic chaos. It is found that the solids motion is chaotic. An increase in the gas flow rate increases the values of the parameters that quantify the chaotic behavior of the solids motion. This analysis is found to constitute a promising tool to determine flow regime transitions. © 1995, American Chemical Society. All rights reserved.
format JOUR
author Cassanello, M.
Larachi, F.
Marie, M.-N.
Guy, C.
Chaouki, J.
author_facet Cassanello, M.
Larachi, F.
Marie, M.-N.
Guy, C.
Chaouki, J.
author_sort Cassanello, M.
title Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization
title_short Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization
title_full Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization
title_fullStr Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization
title_full_unstemmed Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization
title_sort experimental characterization of the solid phase chaotic dynamics in three-phase fluidization
url http://hdl.handle.net/20.500.12110/paper_08885885_v34_n9_p2971_Cassanello
work_keys_str_mv AT cassanellom experimentalcharacterizationofthesolidphasechaoticdynamicsinthreephasefluidization
AT larachif experimentalcharacterizationofthesolidphasechaoticdynamicsinthreephasefluidization
AT mariemn experimentalcharacterizationofthesolidphasechaoticdynamicsinthreephasefluidization
AT guyc experimentalcharacterizationofthesolidphasechaoticdynamicsinthreephasefluidization
AT chaoukij experimentalcharacterizationofthesolidphasechaoticdynamicsinthreephasefluidization
_version_ 1807318827039457280

Ejemplares similares