Hydrodynamics of an inverse liquid–solid circulating conventional fluidized bed

Tian Nan, Jesse Zhu

Research output: Journal PublicationArticlepeer-review

4 Citations (Scopus)


An inverse liquid–solid circulating conventional fluidized bed (I-CCFB) is realized by injecting particles from the top of a conventional liquid–solid fluidized bed (0.076 m ID and 5.4 m height) that is operated in a newly developed circulating conventional fluidization regime located between the conventional and circulating fluidization regimes. The I-CCFB can achieve a higher solids holdup compared to both conventional and circulating liquid–solid fluidized beds. A new parameter, the bed intensification factor, is defined to quantify the increased solids holdup observed with external solids circulation. The Richardson–Zaki equation is shown to be applicable to the I-CCFB regime and can be used to correlate the slip velocity and solids holdup, both of which increase with the solids circulation rate. A new flow regime map is presented, including the I-CCFB and a variety of other liquid–solid fluidized beds.

Original languageEnglish
Article numbere17593
JournalAICHE Journal
Issue number4
Publication statusPublished - Apr 2022
Externally publishedYes


  • circulating conventional fluidized bed
  • inverse fluidization
  • liquid–solid fluidization
  • slip velocity
  • solids holdup

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • General Chemical Engineering


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