Abstract:
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.
Registro:
| Documento: |
Conferencia
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| Título: | Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments |
| Autor: | Fraguío, M.S.; Cassanello, M.C.; Cardona, M.A.; Hojman, D.; Somacal, H. |
| Filiación: | PINMATE, Dep. Industrias, FCEyN, Universidad de Buenos Aires, Int. Güiraldes 2620, Buenos Aires, C1428BGA, Argentina
TANDAR, Comisión Nacional de Energía Atómica (CNEA), Centro Atómico Constituyentes, Buenos Aires, Argentina
ECyT, Universidad Nacional de San Martín, San Martín, Argentina
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| Palabras clave: | 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 |
| Año: | 2007
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| Página de inicio: | 327
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| Página de fin: | 333
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| Título revista: | 5th World Congress in Industrial Process Tomography
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| Título revista abreviado: | World Congr. Indust. Proc. Tomography
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| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97808531_v_n_p327_Fraguio |
Referencias:
- Bhusarapu, S., (2005) Solids Flow Mapping in Gas-Solid Risers, , .Sc. Thesis, Washington University, St. Louis, Missouri, USA
- Bhusarapu, S., Cassanello, M.C., Al-Dahhan, M., Dudukovic, M.P., Trujillo, S., O’hern, T.J., Dynamical Features of the Solid Motion in Gas-Solid Risers (2006) Int. Journal of Multiphase Flow, 33, pp. 164-181
- Boongchen, O., (2003) Experimental Investigation of Bubble Column Hydrodynamics-Effect Of Elevated Pressure And Superficial Gas Velocity, , D.Sc. Thesis, Washington University, St. Louis, Missouri, USA
- Cassanello, M., Larachi, F., Kemoun, A., Al-Dahhan, M.H., Dudukovic, M.P., Inferring liquid chaotic dynamics in bubble columns using CARPT (2001) Chem. Eng. Science, 56, pp. 6125-6134
- Chaouki, J., Larachi, F., Dudukovic, M.P., (1997) Non-Invasive Monitoring of Multiphase Flows, , (Editors), Elsevier, Amsterdam
- Degaleesan, S., (1997) Fluid Dynamic Measurements and Modeling of Liquid Mixing in Bubble Columns, , D.Sc. Thesis, Washington University, St. Louis, Missouri, USA
- Degaleesan, S., Dudukovic, M., Pan, Y., Fluid Mechanics and Transport Phenomenon. Experimental study of gas-induced liquid-flow structures in bubble columns (2001) AIChE J., 47, pp. 1913-1931
- Devanathan, N., Moslemian, D., Dudukovic, M.P., Flow mapping in bubble columns using CARPT (1990) Chem. Eng. Science, 45, pp. 2285-2291
- Devanthan, N., (1991) Investigation of Liquid Hydrodynamics in Bubble Columns via Computer-Automated Radioactive Particle Tracking (CARPT), , D.Sc. Thesis, Washington University, St. Louis, Missouri, USA
- Gupta, P., (2002) Churn-turbulent bubble columns: Experiments and modeling, , D. Sc. Thesis, Washington University, St. Louis, Missouri, USA
- Larachi, F., Kennedy, G., Chaouki, J., A γ-ray Detection System for 3D Particle Tracking in Multiphase Reactors (1994) Nucl. Intr. & Meth., A338, pp. 568-576
- Larachi, F., Cassanello, M., Chaouki, J., Guy, C., Flow structure of the Solids in a Three-Dimensional Gas-Liquid-Solid Fluidized Bed (1996) AIChE J., 42, pp. 2439-2452
- Limtrakul, S., (1996) Hydrodynamics of liquid fluidized beds and gas-liquid fluidized beds, , D.Sc. Thesis, Washington University, Saint Louis, Missouri, USA
- Mostoufi, N., Chaouki, J., Flow structure of the solids in gas-solid fluidized beds (2004) Chem. Eng. Science, 59, pp. 4217-4227
- Rados, N., (2003) Slurry bubble column hydrodynamics: Experimentation and modeling, , D.Sc., Thesis, Washington University, Saint Louis, Missouri, USA
- Rammohan, A., Kemoun, A., Al-Dahhan, M.H., Dudukovic, M.P., Larachi, F., CARPT dynamic bias studies: Evaluation of accuracy of position and velocity measurements (2001) Recents Prog. Genie Procedes, 15, p. 59. , 79, TracersandTracingMethods
- Rammohan, A., (2002) Characterization of Single and Multiphase Flows in Stirred Tank Reactors, , D.Sc. Thesis, Washington University, St. Louis, USAA4 -
Citas:
---------- APA ----------
Fraguío, M.S., Cassanello, M.C., Cardona, M.A., Hojman, D. & Somacal, H.
(2007)
. Tracer fast ascending velocities in a bubble column inferred from carpt-calibration experiments. 5th World Congress in Industrial Process Tomography, 327-333.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97808531_v_n_p327_Fraguio [ ]
---------- CHICAGO ----------
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"
. 5th World Congress in Industrial Process Tomography
(2007) : 327-333.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97808531_v_n_p327_Fraguio [ ]
---------- MLA ----------
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"
. 5th World Congress in Industrial Process Tomography, 2007, pp. 327-333.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97808531_v_n_p327_Fraguio [ ]
---------- VANCOUVER ----------
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. World Congr. Indust. Proc. Tomography. 2007:327-333.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97808531_v_n_p327_Fraguio [ ]
