Laminar mixing performances of baffling, shaft eccentricity and unsteady mixing in a cylindrical vessel

Khai Ching Ng, E. Y.K. Ng

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The laminar mixing performance in a cylindrical vessel agitated by a plate impeller is investigated. Several mixing enhancement strategies such as baffling, shaft eccentricity and angularly-oscillating impeller (unsteady mixing) are considered. The flow equations are solved numerically via a Lagrangian particle method based on the Moving Particle Semi-implicit (MPS) technique. It is observed that radial mixing is poor in an unbaffled vessel agitated by a concentric impeller undergoing steady rotation. In general, baffling has marginally improved the radial momentum exchange between the near-wall and inner fluid particles. This shortcoming can be alleviated by introducing the shaft eccentricity and the unsteady mixing procedure. In general, the unsteady mixing procedure with the smaller oscillating amplitude outperforms all the mixing enhancement strategies considered in the current study.

Original languageEnglish
Pages (from-to)960-974
Number of pages15
JournalChemical Engineering Science
Volume104
DOIs
Publication statusPublished - 18 Dec 2013

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Momentum
Fluids

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

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abstract = "The laminar mixing performance in a cylindrical vessel agitated by a plate impeller is investigated. Several mixing enhancement strategies such as baffling, shaft eccentricity and angularly-oscillating impeller (unsteady mixing) are considered. The flow equations are solved numerically via a Lagrangian particle method based on the Moving Particle Semi-implicit (MPS) technique. It is observed that radial mixing is poor in an unbaffled vessel agitated by a concentric impeller undergoing steady rotation. In general, baffling has marginally improved the radial momentum exchange between the near-wall and inner fluid particles. This shortcoming can be alleviated by introducing the shaft eccentricity and the unsteady mixing procedure. In general, the unsteady mixing procedure with the smaller oscillating amplitude outperforms all the mixing enhancement strategies considered in the current study.",
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Laminar mixing performances of baffling, shaft eccentricity and unsteady mixing in a cylindrical vessel. / Ng, Khai Ching; Ng, E. Y.K.

In: Chemical Engineering Science, Vol. 104, 18.12.2013, p. 960-974.

Research output: Contribution to journalArticle

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