X-ray tomography analysis of bubbles and slugs in a fluidized bed with inter-particle force

Jiliang Ma, Daoyin Liu, Xiaoping Chen, Cai Liang, J. Ruud van Ommen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Bubbles and slugs coexist in a fluidized bed with strong inter-particle forces. However, the effects bubbles and slugs impose over fluidizing stability, and chemical reaction efficiency are different. The present work distinguished bubbles and slugs with the aid of X-ray tomography, and the evolution of their properties with varying inter-particle force in a fluidized bed were studied. The results show that the gas-holding capacity of the emulsion phase improves as inter-particle forces initially increase. In this process, the bubble frequency decreases noticeably, and the bubble size slightly increases. Bubbles rise slower than theoretically predicted because inter-particle force reduces the particle flow. The frequency and the size of slugs increase with inter-particle forces. As forces initially increases, the slug size increases with measurement height. An opposite trend is observed when inter-particle forces continues to strengthen. Near the gas distributor, the slug rising velocity is independent of size. In contrast, large slugs have a higher velocity than small slugs near the bed surface. Finally, three slugging patterns are distinguished, and the influence they impose on particle flow is analyzed.

Original languageEnglish
Article number103835
Number of pages13
JournalInternational Journal of Multiphase Flow
Volume145
DOIs
Publication statusPublished - 2021

Keywords

  • Bubble
  • Fluidized bed
  • Inter-particle force
  • Slug
  • X-ray tomography

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