Experimental Studies of Hydrodynamics and Regime Transition in Bubble Columns

Abstract

The detailed flow structures in bubble columns with and without internal draught tube have been investigated using the PIV technique. The onsets of transition due to vortex formation and different flow patterns with and without draught tube have been studied using the drift-flux model and the experimentally measured Reynolds stresses. The role of solid particles and liquid viscosity, as well as bubbling orifice configuration on the flow patterns and regime transition has also been studied and discussed. On a etudie par la technique PIV les structures d'ecoulement detaillees dans des colonnes a bulles avec et sans tube d'aspiration interne. L'apparition de la transition due a la formation de vortex et a differents profils d'ecoulement avec et sans tube d'aspiration a ete etudiee a l'aide du modele de flux d'aspiration et des contraintes de Reynolds mesurees experimentalement. On a egalement examine le role des particules solides et de la viscosite du liquide ainsi que de la configuration des orifices de bullage sur les profils d'ecoulement et la transition de regime.