CFD simulations of gas-solid flow in an industrial-scale circulating fluidized bed furnace using subgrid-scale drag models

Srujal Shah (Corresponding Author), Kari Myöhänen, Sirpa Kallio, Timo Hyppänen

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

Abstract

Mesoscale flow structures such as clusters and streamers of particles are characteristic features of gas-solid flow in fluidized beds. Numerical simulations of gas-solid flows for industrial-scale fluidized beds are often performed using the Eulerian description of phases. An accurate prediction of this type of flow structure using the Eulerian modeling approach requires a sufficiently fine mesh resolution. Because of the long computational time required when using fine meshes, simulations of industrial-sized units are usually conducted using coarse meshes, which cannot resolve the mesoscale flow structures. This leads to an overestimation of the gas-solid drag force and a false prediction of the flow field. For these cases, a correction must be formulated for the gas-solid drag. We have simulated a large-scale circulating fluidized bed furnace using different gas-solid drag models and compared the model results with measurements.
Original languageEnglish
Pages (from-to)66-75
JournalParticuology
Volume18
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Fluidized bed furnaces
Flow of solids
Drag
Computational fluid dynamics
Gases
Flow structure
Fluidized beds
Flow fields
Computer simulation

Keywords

  • circulating fluidized bed
  • computational fluid dynamics
  • two-fluid model
  • drag correlation
  • modeling

Cite this

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title = "CFD simulations of gas-solid flow in an industrial-scale circulating fluidized bed furnace using subgrid-scale drag models",
abstract = "Mesoscale flow structures such as clusters and streamers of particles are characteristic features of gas-solid flow in fluidized beds. Numerical simulations of gas-solid flows for industrial-scale fluidized beds are often performed using the Eulerian description of phases. An accurate prediction of this type of flow structure using the Eulerian modeling approach requires a sufficiently fine mesh resolution. Because of the long computational time required when using fine meshes, simulations of industrial-sized units are usually conducted using coarse meshes, which cannot resolve the mesoscale flow structures. This leads to an overestimation of the gas-solid drag force and a false prediction of the flow field. For these cases, a correction must be formulated for the gas-solid drag. We have simulated a large-scale circulating fluidized bed furnace using different gas-solid drag models and compared the model results with measurements.",
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CFD simulations of gas-solid flow in an industrial-scale circulating fluidized bed furnace using subgrid-scale drag models. / Shah, Srujal (Corresponding Author); Myöhänen, Kari; Kallio, Sirpa; Hyppänen, Timo.

In: Particuology, Vol. 18, 2015, p. 66-75.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - CFD simulations of gas-solid flow in an industrial-scale circulating fluidized bed furnace using subgrid-scale drag models

AU - Shah, Srujal

AU - Myöhänen, Kari

AU - Kallio, Sirpa

AU - Hyppänen, Timo

PY - 2015

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AB - Mesoscale flow structures such as clusters and streamers of particles are characteristic features of gas-solid flow in fluidized beds. Numerical simulations of gas-solid flows for industrial-scale fluidized beds are often performed using the Eulerian description of phases. An accurate prediction of this type of flow structure using the Eulerian modeling approach requires a sufficiently fine mesh resolution. Because of the long computational time required when using fine meshes, simulations of industrial-sized units are usually conducted using coarse meshes, which cannot resolve the mesoscale flow structures. This leads to an overestimation of the gas-solid drag force and a false prediction of the flow field. For these cases, a correction must be formulated for the gas-solid drag. We have simulated a large-scale circulating fluidized bed furnace using different gas-solid drag models and compared the model results with measurements.

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KW - computational fluid dynamics

KW - two-fluid model

KW - drag correlation

KW - modeling

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