CFD study of local crystal growth rate in a continuous suspension crystallizer

Yuko Mori*, Zuoliang Sha, Marjatta Louhi-Kultanen, Juha Kallas

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

The objective of the present work is to determine the local crystal growth rate in an imperfectly mixed suspension crystallizer. Experiments were carried out in pure potassium sulphate-water solution. The steady-state Crystal Size Distributions (CSDs) were measured at four different heights of the crystallizer using an in-situ particle image analyzer. Experimentally obtained CSD was used to determine the overall growth rate. Then, Computational Fluid Dynamics (CFD) was used to calculate the Particle Size Distributions (PSDs) of the same kind of suspension which was used in the experiments. The computational study was focused to simulate the mass transfer coefficient between particles and solution, and supersaturation, These quantities were determined from hydrodynamics of suspension in a crystallizer. The multi-fluid model was applied to describe suspension flow in the crystallizer. One continuous phase (water) and six dispersed phases, which were taken to be particles in six size classes, were used to approximate PSD. The crystal growth rate model was based on the diffusion process and was implemented into a CFD environment. The local growth rates were calculated from the slip velocity or from energy dissipation rate at the local temperature and supersaturation.

Original languageEnglish
Pages (from-to)1178-1187
Number of pages10
JournalJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume35
Issue number11
DOIs
Publication statusPublished - Nov 2002
MoE publication typeA1 Journal article-refereed

Keywords

  • CFD
  • Crystal growth rate
  • Crystal size distribution
  • Mass transfer
  • Suspension crystallization

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