Foam drainage in the presence of solid particles

Wang, J. and Nguyen, A. V. (2016) Foam drainage in the presence of solid particles. Soft Matter, 12 12: 3004-3012. doi:10.1039/c6sm00028b

Author Wang, J.
Nguyen, A. V.
Title Foam drainage in the presence of solid particles
Journal name Soft Matter   Check publisher's open access policy
ISSN 1744-683X
Publication date 2016-02
Year available 2016
Sub-type Article (original research)
DOI 10.1039/c6sm00028b
Open Access Status Not Open Access
Volume 12
Issue 12
Start page 3004
End page 3012
Total pages 9
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Collection year 2017
Language eng
Formatted abstract
We conducted forced drainage experiments to study the liquid flow within the foams stabilized by a cationic surfactant (CTAB) in the presence of partially hydrophobic silica particles. The results show that the presence of solid particles, even when present in small amounts (0.0932 g L−1 foam), can significantly decrease the foam permeability. The scaling behaviour (power law) between the drainage velocity and the imposed flow rate indicates that the presence of solid particles in the foams triggers a transition of the foam drainage regime from a node-dominated regime to a Plateau border-dominated regime. We applied two foam drainage equations for aqueous foams to simulate the experimental data and interpret the transition. The simulation results show that the presence of solid particles in the foams increases the rigidity of the interfaces and the viscous losses in the channels (the Plateau borders) of the foams, and decreases the foam permeability. We also generalize the theory for the effects of unattached hydrophilic particles on foam drainage by considering the effects of hydrophobicity and concentration of solid particles on the confinement of foam networks. This study explores liquid drainage in three-phase foams and is relevant to the field of hydrophobic particle separation by froth flotation, in which the wash water is commonly applied to the froth layer to improve the product grade.
Keyword Through aqueous foams
Liquid flow
Granular suspensions
Interfacial layers
Forced drainage
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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