Frother Effects on Single Bubble Motion in a Water Column

Abstract

AbstractThere is much discrepancy between experimental data and existing theoretical models for the rise velocities of bubbles in water, due to the difficulties in quantifying the effect of surface-active chemicals on bubbles. The study presented here utilizes the changes in the thickness of the virtual liquid film on a bubble to explain the effect of frother addition on bubble ascent. A contamination factor, C c, which depends on the type and concentration of a frother is introduced. It was found that the model established in this study agrees well with experimental data from the literature, and from direct measurements in a cylindrical water column. The results indicate that the variation in the rising velocity of bubbles in the presence of surfactants, can be conveniently expressed in terms of the changes in the contamination factor of the aqueous solution. Resume Il existe des differences importantes entre les donnees experimentales et les resultats obtenus a partir de modeles theoriques decrivants le...