Experimental and numerical study of pseudo-2D circulating fluidized beds

Adam Klimanek (Corresponding Author), Wojciech Adamczyk, Sirpa Kallio, Pawel Kozolub, Gabriel Wecel, Andrzej Szlek

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

We present experimental investigations and numerical simulations of a pseudo-2D riser. Experiments were performed for various airflow rates, particle types/diameters, and particle size distributions. Pressure distributions along the wall of the riser were measured. Additional measurements from a smaller pseudo-2D riser (Kallio et al., 2009; Shah et al., 2012) were used to analyze horizontal solids volume fraction profiles. The experimental data were compared with simulation results carried out using an Euler-Euler approach. A mesh sensitivity study was conducted for numerical simulations and effects associated with simplifying real 3D geometry to a 2D model were examined. In addition, the effect of using an algebraic equation to represent the granular temperature versus a full partial differential equation also was examined for numerical simulations. Results showed small but significant near-wall sensitivity of the flow variables to mesh size. Substantial differences in mean pressure, solids distribution, and solid velocities were obtained, when 2D and 3D simulation results were compared. Finally, applying the simplified granular temperature equation for turbulent fluidization and for dilute-phase transport can lead to incorrect predictions in models.
Original languageEnglish
Pages (from-to)48-59
JournalParticuology
Volume29
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

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Fluidized beds
Computer simulation
Fluidization
Pressure distribution
Particle size analysis
Particles (particulate matter)
Partial differential equations
Volume fraction
Temperature
Geometry
Experiments

Keywords

  • circulating fluidized bed
  • Euler-Euler approach
  • gas-solid flow
  • kinetic theory of granular flow
  • particle size distribution
  • 2D vs 3D

Cite this

Klimanek, Adam ; Adamczyk, Wojciech ; Kallio, Sirpa ; Kozolub, Pawel ; Wecel, Gabriel ; Szlek, Andrzej. / Experimental and numerical study of pseudo-2D circulating fluidized beds. In: Particuology. 2016 ; Vol. 29. pp. 48-59.
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abstract = "We present experimental investigations and numerical simulations of a pseudo-2D riser. Experiments were performed for various airflow rates, particle types/diameters, and particle size distributions. Pressure distributions along the wall of the riser were measured. Additional measurements from a smaller pseudo-2D riser (Kallio et al., 2009; Shah et al., 2012) were used to analyze horizontal solids volume fraction profiles. The experimental data were compared with simulation results carried out using an Euler-Euler approach. A mesh sensitivity study was conducted for numerical simulations and effects associated with simplifying real 3D geometry to a 2D model were examined. In addition, the effect of using an algebraic equation to represent the granular temperature versus a full partial differential equation also was examined for numerical simulations. Results showed small but significant near-wall sensitivity of the flow variables to mesh size. Substantial differences in mean pressure, solids distribution, and solid velocities were obtained, when 2D and 3D simulation results were compared. Finally, applying the simplified granular temperature equation for turbulent fluidization and for dilute-phase transport can lead to incorrect predictions in models.",
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Experimental and numerical study of pseudo-2D circulating fluidized beds. / Klimanek, Adam (Corresponding Author); Adamczyk, Wojciech; Kallio, Sirpa; Kozolub, Pawel; Wecel, Gabriel; Szlek, Andrzej.

In: Particuology, Vol. 29, 2016, p. 48-59.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Experimental and numerical study of pseudo-2D circulating fluidized beds

AU - Klimanek, Adam

AU - Adamczyk, Wojciech

AU - Kallio, Sirpa

AU - Kozolub, Pawel

AU - Wecel, Gabriel

AU - Szlek, Andrzej

PY - 2016

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N2 - We present experimental investigations and numerical simulations of a pseudo-2D riser. Experiments were performed for various airflow rates, particle types/diameters, and particle size distributions. Pressure distributions along the wall of the riser were measured. Additional measurements from a smaller pseudo-2D riser (Kallio et al., 2009; Shah et al., 2012) were used to analyze horizontal solids volume fraction profiles. The experimental data were compared with simulation results carried out using an Euler-Euler approach. A mesh sensitivity study was conducted for numerical simulations and effects associated with simplifying real 3D geometry to a 2D model were examined. In addition, the effect of using an algebraic equation to represent the granular temperature versus a full partial differential equation also was examined for numerical simulations. Results showed small but significant near-wall sensitivity of the flow variables to mesh size. Substantial differences in mean pressure, solids distribution, and solid velocities were obtained, when 2D and 3D simulation results were compared. Finally, applying the simplified granular temperature equation for turbulent fluidization and for dilute-phase transport can lead to incorrect predictions in models.

AB - We present experimental investigations and numerical simulations of a pseudo-2D riser. Experiments were performed for various airflow rates, particle types/diameters, and particle size distributions. Pressure distributions along the wall of the riser were measured. Additional measurements from a smaller pseudo-2D riser (Kallio et al., 2009; Shah et al., 2012) were used to analyze horizontal solids volume fraction profiles. The experimental data were compared with simulation results carried out using an Euler-Euler approach. A mesh sensitivity study was conducted for numerical simulations and effects associated with simplifying real 3D geometry to a 2D model were examined. In addition, the effect of using an algebraic equation to represent the granular temperature versus a full partial differential equation also was examined for numerical simulations. Results showed small but significant near-wall sensitivity of the flow variables to mesh size. Substantial differences in mean pressure, solids distribution, and solid velocities were obtained, when 2D and 3D simulation results were compared. Finally, applying the simplified granular temperature equation for turbulent fluidization and for dilute-phase transport can lead to incorrect predictions in models.

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KW - gas-solid flow

KW - kinetic theory of granular flow

KW - particle size distribution

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