The minimum fluidization velocity of beds has been determined experimentally in beds of 0.089 m and 0.29 m diameters, respectively. The particles studied had sizes ranging from 100 μm to 1 mm in diameter, and densities from 1128 to 11400 kg/m3. Three distributors were used in the experimental scheme, each perforated by holes of 0.8 mm in diameter but with varying hole densities, as well as a porous plate. It was found that the minimum fluidization velocity was affected by both the diameter and distributor used. The effect of vertical tubular inserts on the minimum fluidization velocity was investigated in the 0.29 m diameter bed. The experimental data in the large bed, using four distributors, were parameterized within experimental error.

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Minimum spouting velocity data are reported for seven mixtures of polystyrene, spouted with air in three rectangular spouted beds of square cross sectional areas, using nozzles of five sizes. Correlations for minimum spouting velocity in cylindrical columns were investigated for this geometry. A new dimensionless correlation for predicting the minimum spouting velocity is developed.Des donnees de vitesse de jaillissement minimale sont presentees pour sept melanges de polystyrene injectes par de I'air dans trois lits jaillissants rectangulaires a regions transversales munis d'orifices de cinq tailles differentes. Des correlations pour la vitesse de jaillissement minimale dans des colonnes cylindriques sont etudiees pour cette geometrie. Une nouvelle correlation adimensionnelle est etablie pour la prediction de la vitesse de jaillissement minimale.Keywords: rectangular spouted beds, minimum spouting velocity, mixed particle size.pouting of a mixture of particles is becoming a common 132