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<p>Carbon anodes used in the Hall-Héroult process for aluminum production are manufactured by applying vertical vibration in the vibro-compaction stage to improve homogeneity and density. To investigate the effect of fluid viscosity on this stage, we prepared model mixtures of coke particles with glycerin–water fluids of varying viscosities, poured them into a transparent vessel, subjected them to vertical vibration, and tracked the bulk surface profile with an ultra-high-speed camera. Higher-viscosity mixtures formed bulks with larger angles of repose due to stronger cohesive forces. Consequently, after vibration, these mixtures compacted more slowly and less uniformly, requiring more time to stabilize. This resistance to compaction stems from a stronger cohesive network, created by viscous and capillary forces that resist particle movement and rearrangement. At the same time, this network helps viscous mixtures transmit vibration energy more effectively, causing the bulk surface to oscillate with larger amplitude.</p>

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Effect of interstitial fluid viscosity on the vibrational response of particle-fluid mixtures

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Amir Kafaei,
  • Louis Gosselin,
  • Houshang Alamdari,
  • Seyed Mohammad Taghavi

摘要

Carbon anodes used in the Hall-Héroult process for aluminum production are manufactured by applying vertical vibration in the vibro-compaction stage to improve homogeneity and density. To investigate the effect of fluid viscosity on this stage, we prepared model mixtures of coke particles with glycerin–water fluids of varying viscosities, poured them into a transparent vessel, subjected them to vertical vibration, and tracked the bulk surface profile with an ultra-high-speed camera. Higher-viscosity mixtures formed bulks with larger angles of repose due to stronger cohesive forces. Consequently, after vibration, these mixtures compacted more slowly and less uniformly, requiring more time to stabilize. This resistance to compaction stems from a stronger cohesive network, created by viscous and capillary forces that resist particle movement and rearrangement. At the same time, this network helps viscous mixtures transmit vibration energy more effectively, causing the bulk surface to oscillate with larger amplitude.