Elutriation and agglomerate size distribution in a silica nanoparticle vibro-fluidized bed

Zhen Feng, Daoyin Liu*, Wangle Zhang, Hao Feng, J. Ruud van Ommen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Fluidization of nanoparticle agglomerates is a promising technique to process nanoparticles. However, possible elutriation of small agglomerates may cause significant loss of bed material. To obtain the elutriation behavior under stable operation, in this study the elutriation fraction of silica nanoparticle agglomerates is measured in a vibro-fluidized bed, which is operated for several hours. Among conditions with different fluidizing gas velocities, Ug, and vibration strength, Λ, the lowest elutriation fraction measured is around 5% after 7-hour fluidization. The elutriation fraction increases significantly with Ug, while varies slightly with Λ. To help elucidating the elutriation behavior, the agglomerates at three different locations (bed surface, splash zone, and bed outlet) are sampled and their size distributions are determined. The elutriation rate constant is found to be much smaller than the literature results for ordinary particles, and the reasons are discussed in detail. Finally, an empirical correlation considering size distribution is proposed to fit the elutriation rate constant for the conditions in this study.

Original languageEnglish
Article number134654
Number of pages12
JournalChemical Engineering Journal
Volume434
DOIs
Publication statusPublished - 2022

Keywords

  • Agglomerate size distribution
  • Elutriation
  • Elutriation rate constant
  • Fluidization
  • Nanoparticle agglomerate

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