Gas–solid flow in a diffuser: Effect of inter-particle and particle–wall collisions

Santosh Kumar Senapati, Sukanta K. Dash

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

This article investigates the role of the specularity coefficient (φ, the extent of the energy dissipation due to particle–wall collisions), inter-particle restitution coefficient (epp, the extent of the energy dissipation due to inter-particle collisions), and four combinations of these variables on the hydrodynamics, and the pressure recovery of the dilute gas–solid suspension in a diffuser. The investigation applies the two-fluid modeling approach along with the kinetic theory of the granular flow. The present investigation's findings indicate that an increase in φ or a reduction in epp reduces the pressure recovery by weakening the reverse momentum transfer phenomenon, which is recognized as the primary means for the pressure recovery. Besides, in a gas–solid flow system, a higher φ or smaller epp enhances the particles’ trapping in the recirculation zone. The recirculation zone's strength and size increase as φ increases or epp reduces. Moreover, an increase in the wall–particle and inter-particle interactions strengthens the sidewise displacement of the particles. The effect of the wall–particle and inter-particle interactions are insignificant for extremely small solid loading.

Original languageEnglish
Pages (from-to)187-200
Number of pages14
JournalParticuology
Volume57
DOIs
Publication statusPublished - 08-2021

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)

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