Aggregation in mixing tanks - the role of inter-particle forces

Jee Wen Lim, J. J. Derksen* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We study aggregation of equally-sized spherical particles under mildly turbulent flow conditions (Reynolds numbers in the range 4000–8000) in a mixing tank through numerical simulation. The dynamics of the liquid flow is solved in terms of the volume-averaged Navier-Stokes equations by an extended lattice-Boltzmann method on a fixed uniform cubic grid. The particle dynamics is updated through applying Newton's second law to each particle. The simulations include a two-parameter model for the attractive force between the particles that causes aggregation. The dynamics of solids and liquid are two-way coupled through a mapping procedure. An overall solids volume fraction of 10% has been investigated. The level of aggregation of particles in the mixing tank mainly depends on the strength of the attractive force and on the impeller-based Reynolds number, not so much on the distance over which the aggregative force is active. A higher Reynolds number leads to less aggregation.

Original languageEnglish
Pages (from-to)278-287
Number of pages10
JournalChemical Engineering Research & Design
Volume152
Early online date16 Oct 2019
DOIs
Publication statusPublished - 1 Dec 2019

Keywords

  • Solids suspension
  • turbulent flow
  • lattice-Boltzmann method
  • aggregation
  • two-way coupling
  • EulerianLagrangian simulation
  • Aggregation
  • Turbulent flow
  • Eulerian–Lagrangian simulation
  • Lattice-Boltzmann method
  • Two-way coupling

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)

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