Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments

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The numerous applications of bubble columns (BC) in diverse fields of the chemical, petrochemical, biochemical and mineral industries are well known. In addition, the ability of the Computer Automated Radioactive Particle Tracking (CARPT) technique to get features of the liquid and/or the solid moti...

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Autores principales: Fraguío, M.S., Cassanello, M.C., Cardona, M.A., Hojman, D., Somacal, H.
Formato: CONF
Materias:
Bubble columns
Radioactive particle tracking
Solid tracers
Calibration
Experiments
Fluidization
Fluidized beds
Liquids
Mineral industry
Neutron irradiation
Radioactive tracers
Radioactivity
Velocity
Calibration experiments
Computer automated radioactive particle tracking
Gas-solid risers
Heterogeneous flow
Neutron bombardments
Pneumatic system
Tracer velocity
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_97808531_v_n_p327_Fraguio
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_97808531_v_n_p327_Fraguio2023-10-03T16:42:53Z Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments Fraguío, M.S. Cassanello, M.C. Cardona, M.A. Hojman, D. Somacal, H. Bubble columns Radioactive particle tracking Solid tracers Calibration Experiments Fluidization Fluidized beds Liquids Mineral industry Neutron irradiation Radioactive tracers Radioactivity Velocity Calibration experiments Computer automated radioactive particle tracking Gas-solid risers Heterogeneous flow Neutron bombardments Pneumatic system Radioactive particle tracking Tracer velocity Bubble columns The numerous applications of bubble columns (BC) in diverse fields of the chemical, petrochemical, biochemical and mineral industries are well known. In addition, the ability of the Computer Automated Radioactive Particle Tracking (CARPT) technique to get features of the liquid and/or the solid motion in BC and slurry BC has been thoroughly demonstrated (Degaleesan et al., 2001; Devanathan et al., 1990). Furthermore, fast ascending velocities of the tracer found during the prolonged tracking periods have been associated to its motion while entrapped into the wake of passing large bubbles, pursuing the inference of information of the gas phase dynamics (Cassanello et al., 2001; Larachi et al., 1996). For other type of contactors (gas-solid risers and fluidized beds), fast tracer velocities have been related to solid clusters (Mostoufi and Chaouki, 2004; Bhusarapu et al., 2006). Therefore, present work pursues to point out, through calibration experiments, if differences between the actual tracer velocities and the velocities calculated from the reconstructed tracer positions during fast ascending/descending paths are acceptable. With this purpose, the motion of a radioactive tracer attached to a rod moving upwards/downwards, driven by a pneumatic system, is reconstructed from the combined response of eight NaI(Tl) scintillation detectors. The tracer is a PVC particle containing scandium oxide, activated by neutron bombardment to around 30 μCi. The rod is moved at different velocities in the range of 0.1 to 1 m/s and it travels 0.2 m upwards and downwards close to the column centre. A mini-pilot scale BC, 0.1m inner diameter and 1.2m high, is used with batch liquid, tap water, and flowing air at different gas velocities within the homogeneous and the heterogeneous flow regimes. Tracer positions are reconstructed every 0.03 s. Fast velocities are calculated from continuously ascending/descending paths and they are compare to the tracer velocity. © 2007, International Society for Industrial Process Tomography. All rights reserved. Fil:Fraguío, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cassanello, M.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cardona, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Hojman, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Somacal, H. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_97808531_v_n_p327_Fraguio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Bubble columns
Radioactive particle tracking
Solid tracers
Calibration
Experiments
Fluidization
Fluidized beds
Liquids
Mineral industry
Neutron irradiation
Radioactive tracers
Radioactivity
Velocity
Calibration experiments
Computer automated radioactive particle tracking
Gas-solid risers
Heterogeneous flow
Neutron bombardments
Pneumatic system
Radioactive particle tracking
Tracer velocity
Bubble columns
spellingShingle Bubble columns
Radioactive particle tracking
Solid tracers
Calibration
Experiments
Fluidization
Fluidized beds
Liquids
Mineral industry
Neutron irradiation
Radioactive tracers
Radioactivity
Velocity
Calibration experiments
Computer automated radioactive particle tracking
Gas-solid risers
Heterogeneous flow
Neutron bombardments
Pneumatic system
Radioactive particle tracking
Tracer velocity
Bubble columns
Fraguío, M.S.
Cassanello, M.C.
Cardona, M.A.
Hojman, D.
Somacal, H.
Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments
topic_facet Bubble columns
Radioactive particle tracking
Solid tracers
Calibration
Experiments
Fluidization
Fluidized beds
Liquids
Mineral industry
Neutron irradiation
Radioactive tracers
Radioactivity
Velocity
Calibration experiments
Computer automated radioactive particle tracking
Gas-solid risers
Heterogeneous flow
Neutron bombardments
Pneumatic system
Radioactive particle tracking
Tracer velocity
Bubble columns
description The numerous applications of bubble columns (BC) in diverse fields of the chemical, petrochemical, biochemical and mineral industries are well known. In addition, the ability of the Computer Automated Radioactive Particle Tracking (CARPT) technique to get features of the liquid and/or the solid motion in BC and slurry BC has been thoroughly demonstrated (Degaleesan et al., 2001; Devanathan et al., 1990). Furthermore, fast ascending velocities of the tracer found during the prolonged tracking periods have been associated to its motion while entrapped into the wake of passing large bubbles, pursuing the inference of information of the gas phase dynamics (Cassanello et al., 2001; Larachi et al., 1996). For other type of contactors (gas-solid risers and fluidized beds), fast tracer velocities have been related to solid clusters (Mostoufi and Chaouki, 2004; Bhusarapu et al., 2006). Therefore, present work pursues to point out, through calibration experiments, if differences between the actual tracer velocities and the velocities calculated from the reconstructed tracer positions during fast ascending/descending paths are acceptable. With this purpose, the motion of a radioactive tracer attached to a rod moving upwards/downwards, driven by a pneumatic system, is reconstructed from the combined response of eight NaI(Tl) scintillation detectors. The tracer is a PVC particle containing scandium oxide, activated by neutron bombardment to around 30 μCi. The rod is moved at different velocities in the range of 0.1 to 1 m/s and it travels 0.2 m upwards and downwards close to the column centre. A mini-pilot scale BC, 0.1m inner diameter and 1.2m high, is used with batch liquid, tap water, and flowing air at different gas velocities within the homogeneous and the heterogeneous flow regimes. Tracer positions are reconstructed every 0.03 s. Fast velocities are calculated from continuously ascending/descending paths and they are compare to the tracer velocity. © 2007, International Society for Industrial Process Tomography. All rights reserved.
format CONF
author Fraguío, M.S.
Cassanello, M.C.
Cardona, M.A.
Hojman, D.
Somacal, H.
author_facet Fraguío, M.S.
Cassanello, M.C.
Cardona, M.A.
Hojman, D.
Somacal, H.
author_sort Fraguío, M.S.
title Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments
title_short Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments
title_full Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments
title_fullStr Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments
title_full_unstemmed Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments
title_sort tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments
url http://hdl.handle.net/20.500.12110/paper_97808531_v_n_p327_Fraguio
work_keys_str_mv AT fraguioms tracerfastascendingvelocitiesinabubblecolumninferredfromcarptcalibrationexperiments
AT cassanellomc tracerfastascendingvelocitiesinabubblecolumninferredfromcarptcalibrationexperiments
AT cardonama tracerfastascendingvelocitiesinabubblecolumninferredfromcarptcalibrationexperiments
AT hojmand tracerfastascendingvelocitiesinabubblecolumninferredfromcarptcalibrationexperiments
AT somacalh tracerfastascendingvelocitiesinabubblecolumninferredfromcarptcalibrationexperiments
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