Influence of Bubble Approach Velocity on Liquid Film Drainage between a Bubble and a Spherical Particle


The flotation process strongly depends on drainage of liquid film between a bubble and a particle which might be influenced by hydrodynamic conditions in a flotation cell. This technical note investigates the influence of bubble approach velocity on the liquid drainage process between a bubble and a particle under constant conditions. It was found that the increase in bubble approach velocity results in a higher critical thickness of the wetting liquid film. The results also showed that the rupture of the films was affected more strongly by electrostatic double layer forces than hydrophobic forces. Hydrophobic forces were more pronounced at high bubble approach velocities. This work shows that hydrodynamic conditions should not be neglected when investigating liquid film drainage process.


Mining Engineering

Keywords and Phrases

Flotation; Hydrodynamics; Hydrophobicity; Liquid films; Velocity; Wetting; Approach velocities; Constant conditions; Critical thickness; Electrostatic double layer force; Film drainage process; Hydrodynamic conditions; Spherical particle; Wetting liquid films; Froth flotation; Article; Bubble; Calculation; Capillary pressure; Controlled study; Critical film thickness; Flotation; Hydrodynamics; Hydrophobicity; Material state; Mathematical computing; Particle size; Physical parameters; Surface property; Velocity; Zeta potential

International Standard Serial Number (ISSN)

0032-5910; 1873-328X

Document Type

Article - Journal

Document Version


File Type





© 2018 Elsevier, All rights reserved.

Publication Date

01 Oct 2018