Effect of frother concentration on bubble trailing vortex characteristics and particle entrainment in flotation

To investigate the effect of frother concentration on bubbles and their tail vortex zone characteristics in flotation is an important prerequisite for predicting the probability of particle coiling in the trailing vortex zone of flotation bubbles. The flow field characteristics of the bubble trailing vortex region under different sec-octyl alcohol (2-octanol) foaming agents were studied by the laboratory homemade proposed rising bubble device and particle image velocimetry system. The fluid separation behavior of the bubble surface and the trailing vortex height characteristics were analyzed. The morphological characteristics of the bubbles and the trajectory and distribution probability of the particles in the bubble wake area were observed with the high-speed camera system. The results of the research are as follows: The size of bubbles slightly decreases and the aspect ratio gradually increases with the increase of the frother concentration. The boundary layer separation angle of the bubbles gradually incr