Kafaei, Amir, Gosselin, Louis, Alamdari, Houshang Darvishi et Taghavi, Seyed Mohammad.
2025.
« Fluid viscosity effects on carbon anode vibro-compaction ».
In Proceedings of the CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025)
Coll. « Progress in Canadian Mechanical Engineering », vol. 8.
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Résumé
Carbon anodes, commonly made by vibro-compaction of anode paste, are an important part of the electrolytic reaction in aluminum production. The overall behavior of anode paste during vibro-compaction is greatly influenced by the properties of coke aggregates and the rheological characteristics of pitch, particularly its viscosity. To simulate this process and investigate the effect of fluid viscosity, we use mixtures of coke particles (80% by volume) combined with a fluid (20% by volume) consisting of glycerin and water. The glycerin-to-fluid volume fraction is varied across four ratios: 70%, 80%, 90%, and 100%. The reason for using a mixture of glycerin and water as a representative fluid is that its viscosity at room temperature resembles the viscosity of the binder matrix (a mixture of coal tar pitch and fine coke particles) at high temperatures in the vibra-compaction stage, as determined through dimensional analysis. Using ultra-high-speed imaging at 3,000 frames per second, we track the representative materials’ dynamics when poured into a transparent vessel and subjected to vertical vibration at 60 Hz frequency and 0.4 mm amplitude. Then, we analyze the effect of glycerine-to-water volume fraction on the bulk average height and height uniformity. Our results show that the vibration activates the void-filling mechanism, minimizes the voids between the particles, and compacts the bulk material through time. In addition, the compaction rate and final degree of uniformity are affected by the glycerin-to-fluid volume fraction. Specifically, mixtures with a lower glycerin-to-fluid volume fraction, indicating a lower viscosity, showed faster compaction and achieved a more uniform final surface profile. The reason is that the lower viscosity of water compared to glycerin reduces interparticle forces and facilitates particle rearrangement during vibration. Our findings contribute to a deeper understanding of vibro-compaction and have potential implications for various vibration-based industrial processes, including those in the pharmaceutical, food processing, and sediment transport. Furthermore, the experimental setup and image analysis techniques developed in this study can be used to investigate the effect of other parameters, such as particle size and vibration frequency, on the vibration-induced dynamics of granular materials.
| Type de document: | Compte rendu de conférence |
|---|---|
| Éditeurs: | Éditeurs ORCID Hof, Lucas A. NON SPÉCIFIÉ Di Labbio, Giuseppe NON SPÉCIFIÉ Tahan, Antoine NON SPÉCIFIÉ Sanjosé, Marlène NON SPÉCIFIÉ Lalonde, Sébastien NON SPÉCIFIÉ Demarquette, Nicole R. NON SPÉCIFIÉ |
| Date de dépôt: | 18 déc. 2025 15:12 |
| Dernière modification: | 18 déc. 2025 15:12 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32431 |
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