The effects of the continuous and dispersed phase velocity and particle size on the axial dispersion of the continuous phase have been determined in two (liquid-liquid) and three (liquid-liquid-solid) phase fluidized beds. In a cocurrent liquid-liquid flow system, the axial dispersion coefficient increases with both the dispersed and continuous phase velocities. In three phase fluidized beds, the coefficient increases with dispersed phase velocity but it decreases with the particle size. Also the coefficient exhibits a maximum value with an increase in the continuous phase velocity at the lower dispersed phase velocities, but it increases with the continuous phase velocity at higher dispersed phase velocities. The axial dispersion coefficients in terms of Peclet number have been correlated in terms of the ratio of fluid velocities and the ratio of the particle size to column diameter, based on the isotropic turbulence theory.Les effets de la vitesse des phases dispersCe et continue et de la taille des particules sur la dispersion axiale de la phase continue, sont dktermines dans des lits fluidises diphasiques (liquide-liquide) et triphasiques (liquide-liquidesolides). Dans un s y s t h e d'ecoulement liquide-liquide 2 cocourant, le coefficient de dispersion axiale augmente avec les vitesses des deux phases dispersee et continue. Dans les lits fluidises triphasiques, le coefficient augmente avec la vitesse de phase dispersee mais diminue avec la taille des particules. De mCme, le coefficient montre une valeur maximale avec une augmentation de la vitesse de phase continue aux vitesses de phase disperskes les plus basses, mais celui-ci augmente avec la vitesse de phase continue ii des vitesses de phase dispersCe plus ClevCes. Les coefficients de dispersion axiale en terrnes du nombre de Peclet ont Ct C corrClCs a partir des vitesses de fluide et du rapport entre la taille des particules et le diamktre de la colonne en utilisant la thCorie de turbulence isotrope.Keywords: cocurrent liquid-liquid upflow, liquid-liquid-solid fluidization, axial dispersion.iquid-liquid-solid three-phase fluidized bed operation can 216
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