Situating the high-density circulating fluidized bed

John R. Grace, Allan S. Issangya, Dingrong Bai, Hsiaotao Bi, Jingxu Zhu

Research output: Journal PublicationArticlepeer-review

160 Citations (Scopus)


Gas-solid flow in high-density circulating fluidized-bed risers differs significantly from that in conventional flow regimes, including fast fluidization and pneumatic conveying. It is shown that when there is no downward flux at the wall at high suspension densities, and hence no core/annulus structure, the flow corresponds to a dense suspension up-flow regime. This flow regime is explained, and its key properties given. A lower boundary is also proposed for this new flow regime based on available data.

Original languageEnglish
Pages (from-to)2108-2116
Number of pages9
JournalAICHE Journal
Issue number10
Publication statusPublished - Oct 1999
Externally publishedYes

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • General Chemical Engineering


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