Artículo
Larachi, F.; Cassanello, M.; Chaouki, J.; Guy, C. "Flow Structure of the Solids in a 3-D Gas-Liquid-Solid Fluidized Bed" (1996) AIChE Journal. 42(9):2439-2452
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Abstract:
Local and macroscopic solids flow structure and kinematics in a 3-D gas-liquid-solid fluidized bed were studied using a noninvasive radioactiue-particle tracking (RPT) technique. Based on the multisite detection of γ radiations emitted from a single radiolabeled tracer particle freely moving in the fluidized bed, RPT permitted to obtain fast sampling of 3-D trajectories of the tracer, whose physical properties were similar to those of the solids inventory. These trajectories showed the detailed motion sequences of the solid particles as entrained in the bubble wakes, fluctuating randomly or sinking deterministically in the liquid-solid emulsion. Based on measurements done in the vortical-spiral flow regime, the dynamic solids flow structure inside a three-phase fluidized bed can be viewed as a three-zone core-annulus-annulus structure; (1) a central fast-bubble flow region with the particles swirling upward; (2) a vortical flow region around the velocity inversion point with the particles momentarily captured in emulsion vortices; and (3) a relatively bubble-free descending flow region where the particles spiral down between the velocity inversion point and vessel walls. Our solids flow structure of dense fluidized beds are similar to the flow structure of liquid and/or solid in lean fluidized beds (observed through laser sheeting imaging). Measured distributions of local ensemble-averaged particle velocities and turbulence intensities were consistent with the existence of a toroidal recirculatory solids flow pattern in the bed. Measured mean circumferential ensemble-averaged radial velocity was essentially zero throughout most of the bed. The solids flow turbulence field was nonisotropic, as radial turbulence intensities were generally lower than longitudinal turbulence intensities.
Registro:
| Documento: | Artículo |
| Título: | Flow Structure of the Solids in a 3-D Gas-Liquid-Solid Fluidized Bed |
| Autor: | Larachi, F.; Cassanello, M.; Chaouki, J.; Guy, C. |
| Filiación: | Dept. of Chemical Engineering, École Polytechnique, Montréal, Que. H3C 3A7, Canada Dept. of Chemical Engineering, Laval University, Sainte-Foy, Que. G1K 7P4, Canada PINMATE, Dept. de Industries, 1428 Ciudad Universitaria, Buenos Aires, Argentina |
| Palabras clave: | Bubbles (in fluids); Fluidized beds; Gamma rays; Kinematics; Physical properties; Radioactive tracers; Three dimensional; Trajectories; Turbulence; Velocity measurement; Vortex flow; Wakes; Bubble wakes; Flow structure; Particle velocities; Radioactive particle tracking; Turbulence intensities; Flow of solids; flow; fluidized beds |
| Año: | 1996 |
| Volumen: | 42 |
| Número: | 9 |
| Página de inicio: | 2439 |
| Página de fin: | 2452 |
| DOI: | http://dx.doi.org/10.1002/aic.690420905 |
| Título revista: | AIChE Journal |
| Título revista abreviado: | AIChE J. |
| ISSN: | 00011541 |
| CODEN: | AICEA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00011541_v42_n9_p2439_Larachi |
Referencias:
- Cassanello, M., Larachi, F., Marie, M.-N., Guy, C., Chaouki, J., Experimental Characterization of the Solid Phase Chaotic Dynamics in Three-Phase Fluidization (1995) Ind. Eng. Chem. Res., 34, p. 2979
- Cassanello, M., Larachi, F., Guy, C., Chaouki, J., Solids Mixing in Gas-Liquid-Solid Fluidized Beds: Experiments and Modeling (1996) Chem. Eng. Sci., 51, p. 2011
- Chen, R.C., Fan, L.-S., Particle Image Velocimelry for Characterizing the Flow Structure in Three-Dimensional Gas-Liquid-Solid Fluidized Beds (1992) Chem. Eng. Sci., 47, p. 3615
- Chen, R.C., Reese, J., Fan, L.S., Flow Structure in a Three-dimensional Bubble Column and Three-phase Fluidized Bed (1994) AIChE J., 40, p. 1093
- Chen, Z., Zheng, C., Feng, Y., Hofmann, H., Modeling of Three-Phase Fluidized Beds Based on Local Bubble Characteristics Measurements (1995) Chem. Eng. Sci., 50, p. 231
- Devanathan, N., Moslemian, D., Dudukovič, M.P., Flow Mapping in Bubble Columns using CARPT (1990) Chem. Eng. Sci., 45, p. 2285
- Dudukovič, M.P., Devanathan, N., Holub, R., Multiphase Reactors: Models and Experimental Verification (1991) Rev. Inst. Fr. Pétr., 46, p. 439
- Dudukovič, M.P., Devanathan, N., Bubble Column Reactors: Some Recent Developments (1993) Chemical Reactor Technology for Environmentally Safe Reactors and Products, p. 353. , NATO ASI Ser. E: Appl. Sciences, H. I. de Lasa, G. Dou and A. Ravella, eds
- Fan, L.-S., (1989) Gas-Liquid-Solid Fluidization Engineering, , Butterworth Series in Chemical Engineering, Stoneham, MA
- Fan, L.-S., Tzeng, J.W., Bi, H.T., Flow Structure in a Two-Dimensional Bubble Column and Three-Phase Fluidized Bed (1992) Fluidization, 3, p. 399. , O. E. Potter and D. J. Nicklin, eds., Engineering Foundation, New York
- Franz, K., Börner, T., Kantorek, H.J., Buchholz, R., Flow Structure in Bubble Columns (1984) Ger. Chem. Eng., 7, p. 365
- Godfroy, L., Larachi, F., Kennedy, G., Grandjean, B.P.A., Chaouki, J., On-Line Flow Visualization in Multiphase Reactors using Neural Networks (1995) Appl. Radiat. Isot.
- Gross, R.W., Kuhlman, J.M., Three-Component Velocity Measurements in a Turbulent Recirculating Bubble-Driven Liquid Flow (1992) Int. J. Multiphase Flow, 18, p. 413
- Hills, J.H., Radial Non-Uniformity of Velocity and Voidage in a Bubble Column (1974) Trans. Ind. Chem. Eng., 52, p. 1
- Kitano, K., Fan, L.-S., Near-Wake Structure of a Single Gas Bubble in a Two-Dimensional Liquid-Solid Fluidized Bed: Solids Holdup (1988) Chem. Eng. Sci, 43, p. 1355
- Kreischer, B.K., Moritomi, H., Fan, L.-S., Wake Solids Holdup Characteristics behind a Single Bubble in a Three-Dimensional Liquid-Solid Fluidized Bed (1990) Int. J. Multiphase Flow, 16, p. 187
- Larachi, F., Kennedy, G., Chaouki, J., A γ-Ray Detection System for 3-D Particle Tracking in Multiphase Reactors (1994) Nucl. Instr. Meth., A338, p. 568
- Larachi, F., Cassanello, M., Marie, M.-N., Chaouki, J., Guy, C., Solids Circulation Patterns in Three-Phase Fluidized Beds Containing Binary Mixtures of Particles as Inferred from RPT (1995) Trans. Ind. Chem. Eng., 73, p. 263
- Lin, J.S., Chen, M.M., Chao, B.T., A Novel Radioactive Particle Tracking Facility for Measurement of Solids Motion in Gas Fluidized Beds (1985) AIChE J., 31, p. 465
- Matsuura, A., Fan, L.-S., Distribution of Bubble Properties in a Gas-Liquid-Solid Fluidized Bed (1984) AIChE J., 30, p. 894
- Miyahara, T., Tsuchiya, K., Fan, L.-S., Mechanism of Particle Entrainment in a Gas-Liquid-Solid Fluidized Bed (1989) AIChE J., 35, p. 1195
- Miyahara, T., Tsuchiya, K., Fan, L.-S., Effect of Turbulent Wake on Bubble-Bubble Interaction in a Gas-Liquid-Solid Fluidized Bed (1991) Chem. Eng. Sci., 46, p. 2368
- Moslemian, D., Chen, M.M., Chao, B.T., Experimental and Numerical Investigations of Solids Mixing in a Gas-Solid Fluidized Bed (1989) Particulate Sci. Technol., 7, p. 335
- Moslemian, D., Devanathan, N., Dudukovi, M.P., Radioactive Particle Tracking for Investigation of Phase Recirculation and Turbulence in Multiphase Systems (1992) Rev. Sci. Instrum., 63, p. 4361
- Reese, J., Fan, L.-S., Transient Flow Structure in the Entrance Region of a Bubble Column using Particle Image Velocimetry (1994) Chem. Eng. Sci., 49, p. 5623
- Sokolichin, A., Eigenberger, G., Gas-Liquid Flow in Bubble Columns and Loop Reactors: Part I. Detailed Modelling and Numerical Simulation (1994) Chem. Eng. Sci., 49, p. 5735
- Tsuchiya, K., Fan, L.-S., Near-Wake Structure of a Single Gas Bubble in a Two-Dimensional Liquid-Solid Fluidized Bed: Vortex Shedding and Wake Size Variation (1988) Chem. Eng. Sci., 43, p. 1167
- Tsuchiya, K., Song, G.H., Tank, W.T., Fan, L.-S., Particle Drift Induced by a Bubble in a Liquid-Solid Fluidized Bed with Low-Density Particles (1992) AIChE J., 38, p. 1847
- Tzeng, J.W., Chen, R.C., Fan, L.-S., Visualization of Flow Characteristics in a 2-D Bubble Column and Three-Phase Fluidized Bed (1993) AIChE J., 39, p. 733
- Yang, Y.B., Devanathan, N., Dudukovi, M.P., Liquid Backmixing in Bubble Columns via Computer Automated Particle Tracking (CARPT) (1992) Chem. Eng. Sci., 47, p. 2859
- (1993) Exp. Fluids, 16, p. 1
- Yu, Y.H., Kim, S.D., Bubble Characteristics in the Radial Direction of Three-Phase Fluidized Beds (1988) AIChE J., 34, p. 2069
Citas:
---------- APA ----------
Larachi, F., Cassanello, M., Chaouki, J. & Guy, C. (1996) . Flow Structure of the Solids in a 3-D Gas-Liquid-Solid Fluidized Bed. AIChE Journal, 42(9), 2439-2452.http://dx.doi.org/10.1002/aic.690420905
---------- CHICAGO ----------
Larachi, F., Cassanello, M., Chaouki, J., Guy, C. "Flow Structure of the Solids in a 3-D Gas-Liquid-Solid Fluidized Bed" . AIChE Journal 42, no. 9 (1996) : 2439-2452.http://dx.doi.org/10.1002/aic.690420905
---------- MLA ----------
Larachi, F., Cassanello, M., Chaouki, J., Guy, C. "Flow Structure of the Solids in a 3-D Gas-Liquid-Solid Fluidized Bed" . AIChE Journal, vol. 42, no. 9, 1996, pp. 2439-2452.http://dx.doi.org/10.1002/aic.690420905
---------- VANCOUVER ----------
Larachi, F., Cassanello, M., Chaouki, J., Guy, C. Flow Structure of the Solids in a 3-D Gas-Liquid-Solid Fluidized Bed. AIChE J. 1996;42(9):2439-2452.http://dx.doi.org/10.1002/aic.690420905
