Analysis and estimation/prediction of the disk stack centrifuge separation performance–Scaling from benchtop fixed rotor type to disk stack centrifuges

Mengyan Yang, Xiaolin Liu, John A. Howell, Hui Cheng

Research output: Contribution to journalArticle

Abstract

A mathematical model is proposed to calculate the total separation effectiveness in terms of GT for a disk stack centrifuge taking account of the variation of the centrifugal force with a position in the disk. In practice, the centrifuge ability/force is often referred as Relative Centrifugal Force (RCF) or G number, which is a multiple of the centrifugal acceleration over the gravitational acceleration. As the radial velocity varies it is important to integrate the relative centrifuge force, here in terms of the G number along the path taking account of the change in velocity. The separation effectiveness, GT is defined as an integrated product of local G number, G(x) and local residential time (dt), where dt is the time taken for the bulk fluid to traverse a distance from r to r+ dr. The GT value calculated for a disk type centrifuge can be compared with the GT value of others and compared with a bench top fixed rotor centrifuge. An industrial centrifuge would be expected to be able to deliver similar separation performance to a pilot or a lab scale one, if operated at the same/similar value of GT. This would allow the performance of a full-scale clarifier to be predicted. This model is, in essence, a simple alternative to the Sigma concept.

Original languageEnglish
JournalSeparation Science and Technology (Philadelphia)
Early online date1 Jul 2019
DOIs
Publication statusE-pub ahead of print - 1 Jul 2019

Keywords

  • Centrifuge
  • separation scaling

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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