Experiments have been carried out with jet mixers to study the solid suspension characteristics. The jet velocities required for solid suspension in 0.5 and 1 m ID tanks were measured experimentally. The nozzle diameter was varied from 0.0156 to 0.05 m. The nozzle clearance from the tank bottom was varied from 0.1 to 0.9 m. Tap water and sand of average sizes 100, 300, and 500 µm were used. The solid loading was varied from 1 to 5% (wt.). The effect of nozzle angle was also studied. A semi-empirical model has been developed to predict the jet velocity needed to achieve a certain degree of suspension.

Abstract

Des expériences ont été réalisées avec des mélangeurs à jets afin d'étudier les caractéristiques des suspensions de solides. Les vitesses de jet requises pour la suspension de solides dans des réservoirs de 0,5 et 1 m de diamètre intérieur ont été mesurées expérimentalement. On a fait varier le diamètre de l'orifice entre 0,0156 et 0,05 m. L'espace entre l'orifice et le fond du réservoir varie entre 0,1 et 0,9 m. De l'eau du robinet et des grains de sable de tailles moyennes de 100, 300 et 500 µm ont été utilisés. On a fait varier la charge de solides de 1 à 5% (en poids). L'effet de l'angle de l'orifice a également été étudié. On a mis au point un modèle semi-empirique pour prédire la vitesse de jet requise pour atteindre un certain degré de suspension.

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Volume83, Issue5

October 2005

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