CFD Modeling of Air Flow on Wall Deposition in Different Spray Dryer Geometries

Samaneh Keshani, Mohammad Hossein Montazeri, Wan Ramli Wan Daud, M. Mohsen Nourouzi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Wall deposition is one of the most conventional problems in the spray drying process. The operation of a spray dryer is affected by the wall deposition fluxes inside the equipment. In this study, computational fluid dynamic (CFD) simulation was used to investigate the effect of spray dryer geometry on wall deposition. A CFD model was developed for different geometries of spray dryer with a conical (case A) or a parabolic (cases B and C) bottom. The results implied that the parabolic geometry resulted in a lower deposition rate on the spray dryer walls. A comparison of results using the P-values (F-test) of the air velocity, in the conical and parabolic geometries, showed that there was a significant difference in air stability between them. The flow field in conical geometry case A was significantly more unstable, and parabolic geometry case C produced the most uniform airflow patterns. Moreover, the higher wall shear stress in case C, with lower values of the vorticity, would result in less wall deposition.

Original languageEnglish
Pages (from-to)784-795
Number of pages12
JournalDrying Technology
Volume33
Issue number7
DOIs
Publication statusPublished - 19 May 2015

Fingerprint

drying apparatus
Driers (materials)
air flow
computational fluid dynamics
sprayers
Computational fluid dynamics
Geometry
geometry
Air
Spray drying
air
Deposition rates
Vorticity
dynamic models
vorticity
shear stress
drying
Shear stress
Dynamic models
Flow fields

Keywords

  • Air flow
  • Computational fluid dynamics (CFD)
  • Cone geometry
  • Parabolic geometry
  • Spray dryer
  • Vortex
  • Vorticity
  • Wall deposition
  • Wall shear stress

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

CFD Modeling of Air Flow on Wall Deposition in Different Spray Dryer Geometries. / Keshani, Samaneh; Montazeri, Mohammad Hossein; Wan Daud, Wan Ramli; Nourouzi, M. Mohsen.

In: Drying Technology, Vol. 33, No. 7, 19.05.2015, p. 784-795.

Research output: Contribution to journalArticle

Keshani, Samaneh ; Montazeri, Mohammad Hossein ; Wan Daud, Wan Ramli ; Nourouzi, M. Mohsen. / CFD Modeling of Air Flow on Wall Deposition in Different Spray Dryer Geometries. In: Drying Technology. 2015 ; Vol. 33, No. 7. pp. 784-795.
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