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Studies on Liquid—Gas and Three-Phase Fluidized Beds with Pulsating Air Flows

Authors

  • Christopher G. J. Baker,

    Corresponding author
    1. Department of Chemical Engineering, Kuwait University, P.O. Box 5969 Safat, 13060 Kuwait
    • Department of Chemical Engineering, Kuwait University, P.O. Box 5969 Safat, 13060 Kuwait
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  • Thari S. T. Al-Rashidi,

    1. Department of Chemical Engineering, Kuwait University, P.O. Box 5969 Safat, 13060 Kuwait
    Current affiliation:
    1. Kuwait National Petroleum Co., Mina Al-Ahmadi Refinery, P.O. Box 10252, Shuaiba, 65453 Kuwait
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  • Abdul R. Khan

    1. Department of Chemical Engineering, Kuwait University, P.O. Box 5969 Safat, 13060 Kuwait
    Current affiliation:
    1. Department of Chemical and Petroleum Engineering, United Arab Emirates University, P.O. Box 17555, Al-Ain, United Arab Emirates
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Abstract

The effects of air-flow pulsation and water and air flowrates on the hydrodynamics of liquid—gas and three-phase fluidized beds containing 3-mm glass beads have been studied in a 90-mm i.d. column. Under steady-flow conditions, both types of bed contained a relatively large number of small bubbles. With a pulsing air flow, however, a smaller number of much larger bubbles or slugs were formed. This was attributed to different mechanisms of bubble formation at the distributor. Variations in phase holdup were explained in terms of the effects of the operating parameters on the bubble characteristics.

Abstract

On a étudié dans une colonne de 90 mm de diamètre intérieur les effets de la pulsation air-écoulement et des débits d'eau et d'air sur l' hydrodynamique de lits fluidisés gaz—liquide et triphasiques contenant des billes de verre de 3 mm. Dans des conditions d'écoulement en régime permanent, les deux types de lit contenaient un nombre relativement important de petites bulles. Toutefois, avec un écoulement à air pulsé, il s 'est formé un moins grand nombre de bulles de très grande dimension ou de bouchons. Ceci est imputable aux différents mécanismes de formation des bulles au niveau du distributeur. Les variations dans la rétention des phases sont expliquées par les effets des paramètres opératoires sur les caractéristiques des bulles.

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