Turbulent gas‐particle flow in vertical risers

Sanjay Dasgupta, Roy Jackson, Sankaran Sundaresan

Research output: Contribution to journalArticle

138 Scopus citations

Abstract

Many experimental studies on the cross‐sectional distribution of particles in vertical risers have revealed marked segregation of particles. These flows are inherently unsteady with large fluctuations in suspension density. In this article, we have analyzed the time‐smoothed equations for the motion of dense suspensions to demonstrate the role of these fluctuations on the occurrence of segregation. It is shown that the particles will congregate in regions where the kinetic energy of fluctuations associated with the particles is small. In the context of transport of small particles such as FCC, a simplified model based on the mixture velocity can be constructed. A speculative K‐ϵ model based on this velocity is analyzed to illustrate the extent of segregation of particles afforded by unsteady fluctuations.

Original languageEnglish (US)
Pages (from-to)215-228
Number of pages14
JournalAIChE Journal
Volume40
Issue number2
DOIs
StatePublished - Feb 1994

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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