Simulations of solid-liquid mass transfer in fixed and fluidized beds

J. J. Derksen*

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Solid-to-liquid mass transfer as a result of liquid flow through static and dynamic assemblies of mono-sized solid spheres has been simulated. The three-dimensional, transient simulations fully resolve the flow of liquid in the interstitial space between the spheres by means of a lattice-Boltzmann scheme. For the mass transfer process, a finite volume method on Coupled Overlapping Domains (CODs) is used. Spherical grids around the particles allow for resolving the thin scalar concentration boundary layers that are the result of high Schmidt numbers (Sc up to 1000). The spherical grids - one for each sphere - are coupled to an outer cubic grid. Particle-based Reynolds numbers are in the range 1-10; solids volume fractions are 0.15-0.40. The results demonstrate the validity of the COD approach for multi-particle systems, and provide insight in the dependencies of the Sherwood number on the solid-liquid system characteristics. It is shown that for moderate solid-over-liquid density ratios, fluidized particle assemblies have lower Sherwood numbers than fixed beds. (C) 2014 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)233-244
Number of pages12
JournalChemical Engineering Journal
Volume255
Early online date23 Jun 2014
DOIs
Publication statusPublished - 1 Nov 2014

Keywords

  • mass transfer
  • multiphase flow
  • fixed beds
  • liquid-solid fluidization
  • suspensions
  • Lattice-Boltzmann method
  • Lattice-Boltzmann simulations
  • hyperbolic conservation-laws
  • high-resolution schemes
  • isotropic turbulence
  • dense suspensions
  • single sphere
  • particle
  • flow
  • fluctuations
  • monodisperse

Cite this

Simulations of solid-liquid mass transfer in fixed and fluidized beds. / Derksen, J. J.

In: Chemical Engineering Journal, Vol. 255, 01.11.2014, p. 233-244.

Research output: Contribution to journalArticle

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AB - Solid-to-liquid mass transfer as a result of liquid flow through static and dynamic assemblies of mono-sized solid spheres has been simulated. The three-dimensional, transient simulations fully resolve the flow of liquid in the interstitial space between the spheres by means of a lattice-Boltzmann scheme. For the mass transfer process, a finite volume method on Coupled Overlapping Domains (CODs) is used. Spherical grids around the particles allow for resolving the thin scalar concentration boundary layers that are the result of high Schmidt numbers (Sc up to 1000). The spherical grids - one for each sphere - are coupled to an outer cubic grid. Particle-based Reynolds numbers are in the range 1-10; solids volume fractions are 0.15-0.40. The results demonstrate the validity of the COD approach for multi-particle systems, and provide insight in the dependencies of the Sherwood number on the solid-liquid system characteristics. It is shown that for moderate solid-over-liquid density ratios, fluidized particle assemblies have lower Sherwood numbers than fixed beds. (C) 2014 Elsevier B.V. All rights reserved.

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