Mean and Turbulent Particle Velocity in the Fully Developed Region of a Three‐Phase Fluidized Bed

A thorough experimental description of the time-averaged solids flow in the fully developed region of a cylindrical gas-liquid-solid fluidized bed was provided by using a noninvasive radioactive particle tracking technique (RPT). The 3-D local instantaneous velocity components (radial, axial, azimuthal) of a single radioactive solid tracer, having properties identical to those of the solids in the bed, were measured noninvasively over extended time periods to establish the radial distributions in the fully developed region of axial and radial particle mean and turbulent velocities, shear stress, and axial and radial eddy diffusion coefficients. Glass beads and polyvinyl chloride particles of various shapes and sizes were water-fluidized singly or as binary mixtures in a 100 mm ID Plexiglas column over air and water superficial velocity ranges that spanned the dispersed bubble, coalesced bubble, and transitional flow regimes.

[1]  Liang-Shih Fan,et al.  Flow structure in a three‐dimensional bubble column and three‐phase fluidized bed , 1994 .

[2]  J. Chaouki,et al.  Flow structure of the solids in a three-dimensional liquid fluidized bed , 1997 .

[3]  Jamal Chaouki,et al.  Experimental characterization of the solid phase chaotic dynamics in three-phase fluidization , 1995 .

[4]  Milorad P. Dudukovic,et al.  Multiphase Reactors: Models and Experimental Verification , 1991 .

[5]  S. Morooka,et al.  RECIRCULATING TURBULENT FLOW OF LIQUID IN GAS-LIQUID-SOLID FLUIDIZED BED , 1982 .

[6]  Milorad P. Dudukovic,et al.  A Two-Compartment Convective-Diffusion Model for Slurry Bubble Column Reactors† , 1997 .

[7]  J. Chaouki,et al.  A γ-ray detection system for 3-D particle tracking in multiphase reactors , 1994 .

[8]  M. Duduković,et al.  Flow mapping in bubble columns using CARPT , 1990 .

[9]  J. R. Reese,et al.  Particle image velocimetry: Application for the characterization of the flow structure in three phase fluidized beds , 1997 .

[10]  Faïçal Larachi,et al.  Non-invasive monitoring of multiphase flows , 1997 .

[11]  M. P. Duduković,et al.  Liquid backmixing in bubble columns via computer-automated radioactive particle tracking (CARPT) , 1993 .

[12]  Milorad P. Dudukovic,et al.  Radioactive particle tracking technique for investigation of phase recirculation and turbulence in multiphase systems , 1992 .

[13]  EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF SOLIDS MIXING IN A GAS FLUIDIZED BED , 1989 .

[14]  Jamal Chaouki,et al.  Flow structure of the solids in a 3‐D gas–liquid–solid fluidized bed , 1996 .