Highly swirling transient flows in spray dryers and consequent effect on modeling of particle deposition

M. W. Woo, L. M. Che, Wan Ramli Wan Daud, A. S. Mujumdar, X. D. Chen

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Cotton turf and hotwire measurements were used to experimentally assess the highly swirling flow characteristics in a spray dryer fitted with a rotary disc atomizer. The numerical simulation captured key features of the flow field. Analysis revealed that rapid rotation of an atomizing disc tends to centrifugally split the central inlet jet. The flow field exhibited significant long time-scale transient behaviour. However, this centrifugally split jet resulted in a balanced upward recirculation region in the chamber as expected by the jet-feedback mechanism. Detailed analysis using a 'transient air-steady particle' approach revealed that this approach is applicable for such highly swirling transient flows as well. However, caution should be exercised when interpreting the deposition results, particularly in regions of low particle velocities. This is anticipated be an important consideration in future attempts to simulate the predominantly transient flows in spray dryers.

Original languageEnglish
Pages (from-to)336-345
Number of pages10
JournalChemical Engineering Research and Design
Volume90
Issue number3
DOIs
Publication statusPublished - Mar 2012

Fingerprint

Flow fields
Swirling flow
Atomizers
Cotton
Feedback
Computer simulation
Air

Keywords

  • CFD
  • Particle deposition
  • Rotating disc
  • Spray dryer
  • Transient air flow

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Highly swirling transient flows in spray dryers and consequent effect on modeling of particle deposition. / Woo, M. W.; Che, L. M.; Wan Daud, Wan Ramli; Mujumdar, A. S.; Chen, X. D.

In: Chemical Engineering Research and Design, Vol. 90, No. 3, 03.2012, p. 336-345.

Research output: Contribution to journalArticle

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