- Title
- Effect of surfactant concentration and surface loading on the dynamics of a rising particle-laden bubble
- Creator
- Wang, Ai; Banks, Edwin; Evans, Geoffrey; Mitra, Subhasish
- Relation
- ARC.CE200100009 http://purl.org/au-research/grants/arc/CE200100009
- Relation
- Chemical Engineering Science Vol. 288, no. 119812
- Publisher Link
- http://dx.doi.org/10.1016/j.ces.2024.119812
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2024
- Description
- Selective separation of both inorganic and organic particles by flotation process involving air bubbles has wide application areas which critically depends on the particle laden bubble rise velocity. In this study, the rising behaviour of particle-laden bubbles (particle diameter dp ∼ 114 μm, bubble diameter dB = 2.88 ± 0.07 mm) at various surfactant concentrations (Sodium Dodecyl Sulphate, 0 % − 25 % cmc) was investigated. Bubble velocity, aspect ratio and bubble surface loading (BSL) parameters were quantified by high-speed imaging. A regime map was proposed to determine the effect of particles and surfactant on the observed bubble surface mobility condition. Also, an unsteady-state mathematical model based on force balance approach with appropriate drag correction factor was developed to predict the rise velocity of a particle-laden bubble. The model produced reasonable agreement with the experiment specifically in the high surfactant concentration cases where the bubble shape became nearly spherical.
- Subject
- flotation; bubble rise velocity; drag coefficient; bubble surface loading (BSL); surfactant; bubble-particle aggregates
- Identifier
- http://hdl.handle.net/1959.13/1497538
- Identifier
- uon:54389
- Identifier
- ISSN:0009-2509
- Language
- eng
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