Effect of Inventory Change in a Liquid - Solid Circulating Fluidized Bed (LSCFB)

Nirmala Gnanasundaram*, Aswin Venugopal, Y. Katragadda, Gokul Ullas

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Circulating fluidized beds (CFB) play a major role in the chemical industry especially as heterogeneous catalytic reactors. Research on hydrodynamic properties of Liquid - Solid CFBs (LSCFB) is significantly under-reported as compared to Gas - Solid CFBs (GSCFB). Steadily, prominent research is being established in fields like food industry (whey protein recovery), waste management (removal of heavy metals from radioactive wastes) and others, which use LSCFBs. In this context, it is important to have significant knowledge about the changes occurring in hydrodynamic properties like solid hold-up, rate of solid circulation etc., on changing certain critical physical properties such as inventory height. An LSCFB of height 2.95m and riser outer diameter 0.1m was chosen and the effect of inventory height on the properties was studied by taking the initial inventory heights as 15cm, 25cm and 35cm. The hydrodynamic studies concentrated on axial solid holdup, average solid holdup, solid circulation rate and slip velocity. On increasing the inventory, uniformity of axial solid holdup was confirmed along with studying holdup patterns. Solid flux was seen to follow an inverse relationship to holdup, as expected. The change in slip velocity with varying inventory was also checked, and was found to decrease with inventory. The distribution parameter, Co of the drift flux model was used to determine the extent of non-uniformity in solid distribution. Co was calculated to be less than unity in the range of 0.983-0.994, suggesting non-uniformity in solid distribution, with higher solid concentration by the walls compared to the core.

Original languageEnglish
Article number20170021
JournalChemical Product and Process Modeling
Issue number4
Publication statusPublished - 27 Nov 2017


  • axial solid holdup
  • inventory
  • slip velocity
  • solid circulation rate


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