Experimental study of the effect of particle collision on bubble dynamics behavior

Abstract

Particle–bubble flows are commonly found in industrial processes such as mineral flotation, catalytic reactors, and fluidized beds. This study reports the behavior of particles colliding with adhered bubbles on surfaces, resulting in their detachment. The effects of particle diameter, particle collision velocity, and bubble height on bubble dynamics were investigated. To connect the three factors together, the Weber number of the particles was fitted with the different heights of bubbles to derive a critical detachment curve for bubbles at varying particle diameters. The results indicate that the detachment height of bubbles is inversely proportional to the collision velocity and diameter of the particles. Additionally, among these three factors, the primary force influencing the bubble detachment time is the capillary force of the particles.