Minimum spouting velocity for binary mixture of particles in rectangular spouted beds

Abstract

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

Prediction of minimum spouting velocity of spouted bed by CFD‐TFM: Scale‐up

“…Some experimental data were used to evaluate the new correlation. Figure a compares u ms predicted by Equation and the experimental data from several researches . Favourable agreement is achieved in most cases, with most deviations <20% and almost all deviations within ±35%.…”

“…Figure 8a compares u ms predicted by Equation (1) and the experimental data from several researches. [2][3][4][17][18][19] Favourable agreement is achieved in most cases, with most deviations <20% and almost all deviations within AE35%. The average deviation is approximately 11.6%.…”

Prediction of minimum spouting velocity in spouted bed

“…From the Fig. 1, it can be seen that the minimum spouting velocity increases with an increasing bed height and particle diameter 7, 8. The minimum spouting velocity increases with increasing inlet nozzle diameter due to the increase in the area of hollowed central core (Fig.…”

“…2). 7 The important literature correlations for minimum spouting velocity are listed in Table 2. The present data along with literature data7–14 are used to evaluate the performance of the available correlations 1–7.…”

“…The basic and common approach for the successful design and scale‐up of spouted bed is to use empirical correlations. Even though many correlations have been published in literature for the estimation of minimum spouting velocity, most of them are restricted to a limited range of application in terms of particle diameter, inlet nozzle diameter, particle density etc.,1–7 and hence in this paper an attempt has been made to develop an empirical correlation to predict the minimum spouting velocity in terms of fundamental and operating variables.…”