Suspension pattern and rising height of sedimentary particles with low concentration in a mechanically stirred vessel

Yuichiro Tokura, Keita Miyagawa, Md Azhar Uddin, Yoshiei Kato

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, the effects of impeller rotation speed, off-bottom clearance, blade angle, types of solid and liquid, etc., on the suspension pattern of sedimentary particles and particle rise height in liquid were investigated with a hemispherical vessel without baffles under low particle concentration. The transition conditions of suspension pattern between regimes I and II, and regimes II and III, were observed visually, and their non-dimensional equations were expressed with an acceptable correlation by varying the above operation factors a great deal. Here, regime I is stagnation of particles on a vessel bottom, II is partial suspension, and III is complete suspension in liquid. The non-dimensional equation of the maximum particle rise height was also successfully obtained. The combination of the non-dimensional equations of transition and maximum particle rise height permitted us to determine the adequate solid/liquid mixing operation conditions without collision of particles with device parts.

Original languageEnglish
JournalCanadian Journal of Chemical Engineering
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • mechanical stirring
  • PIV
  • sedimentary particle
  • solid/liquid mixing
  • suspension

ASJC Scopus subject areas

  • Chemical Engineering(all)

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