- Title
- High speed video observations of alumina-coated air bubble coalescence
- Creator
- Smith, Jacqueline; Bournival, Ghislain; Tan, Sin-Ying; Webber, Grant B.; Ata, Seher; Wanless, Erica J.
- Relation
- Chemica 14: Processing Excellence; Powering Our Future. Proceedings from Chemeca 14: Processing Excellence; Powering Our Future (Perth, W.A. 28 September - 1 October, 2014) p. 691-702
- Relation
- ARC.DP120102305
- Relation
- http://www.icheme.org/chemeca2014/program/papers.aspx
- Publisher
- Engineers Australia
- Resource Type
- conference paper
- Date
- 2014
- Description
- The interactions between two particle-stabilised air bubbles in aqueous electrolyte were studied using a coalescence rig. The bubble stability and the dynamics of the coalescing bubbles were investigated in the presence of adsorbed spherical alumina particles with a d₅₀ of 24.2 µm and a density of 3.64 g/cm³. Coalescence events were recorded using high-speed video imaging for both symmetric (both bubbles coated) and asymmetric (one bubble coated) geometries. It was found that the coalescence time (the time between initial bubble-bubble contact and rupture) is directly related to the number of particles adsorbed to the bubble interface. The coalescence dynamics of the bubbles were modelled with a simple damped harmonic oscillator model. It was found that increasing bubble surface coverage by particles resulted in an increased damping coefficient. Both the bubble stability and rigidity of the alumina-air bubble system were found to be higher than previous studies using glass particles. The fraction of particles detached upon bubble coalescence confirmed that bubble coverage had no significant effect on the fraction of particles detached although this was lower than in previous studies. Physical characteristics such as particle size, dispersity, roughness and density were considered for their role in the behaviour of the particle-stabilised bubbles.
- Subject
- bubble stability; coalescence dynamics; alumina; particle detachment
- Identifier
- http://hdl.handle.net/1959.13/1293798
- Identifier
- uon:18676
- Identifier
- ISBN:9781922107381
- Language
- eng
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