Hydrodynamics of a uniform liquid-fluidized bed containing a binary mixture of particles

Maureen A. Howley, Benjamin Glasser

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

This paper examines the steady state hydrodynamics of a fluidized bed of two particle species, having different diameters and densities. Steady state mixing solutions of the volume-averaged equations of motion for the fluid and particles are sought. An expression for the fluid-particle interactive force (in the mixture) is postulated to close the continuum equations of motion using an excluded volume assumption. Solutions to the equations are found for a fluidized bed of glass beads and carbon char in water. It is shown that the solution sets not only characterize the composition and expansion behavior of the mixing states, but also provide a description of the observed phenomenon of "layer inversion". The model identifies three possible layer inversion scenarios, one of which has been observed experimentally. Comparison with experimental data suggest that the hydrodynamic mechanism of fluid-particle interaction is not fully captured with an excluded volume assumption. Thus, we show how experimental data can be used to derive functional forms for expressing the complex hydrodynamic behavior within the framework of the model.

Original languageEnglish (US)
Pages (from-to)4209-4226
Number of pages18
JournalChemical Engineering Science
Volume57
Issue number19
DOIs
StatePublished - Oct 1 2002

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Binary mixtures
Fluidized beds
Inversion layers
Hydrodynamics
Equations of motion
Fluids
Liquids
Particle interactions
Carbon
Glass
Water
Chemical analysis

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "This paper examines the steady state hydrodynamics of a fluidized bed of two particle species, having different diameters and densities. Steady state mixing solutions of the volume-averaged equations of motion for the fluid and particles are sought. An expression for the fluid-particle interactive force (in the mixture) is postulated to close the continuum equations of motion using an excluded volume assumption. Solutions to the equations are found for a fluidized bed of glass beads and carbon char in water. It is shown that the solution sets not only characterize the composition and expansion behavior of the mixing states, but also provide a description of the observed phenomenon of {"}layer inversion{"}. The model identifies three possible layer inversion scenarios, one of which has been observed experimentally. Comparison with experimental data suggest that the hydrodynamic mechanism of fluid-particle interaction is not fully captured with an excluded volume assumption. Thus, we show how experimental data can be used to derive functional forms for expressing the complex hydrodynamic behavior within the framework of the model.",
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Hydrodynamics of a uniform liquid-fluidized bed containing a binary mixture of particles. / Howley, Maureen A.; Glasser, Benjamin.

In: Chemical Engineering Science, Vol. 57, No. 19, 01.10.2002, p. 4209-4226.

Research output: Contribution to journalArticle

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