Wall effects on space averaged two-fluid model equations for simulations of gas-solid flows in risers

S. Shah (Corresponding Author), J. Ritvanen, T. Hyppänen, Sirpa Kallio

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

For the study of gas–solid flows in a circulating fluidized bed (CFB) riser, the model based on the Eulerian description of phases is widely used. Such a description requires the usage of a fine mesh and a short time step in the numerical simulations. Due to the constraint of long calculation times with fine meshes, it becomes practical to simulate the gas–solid flow in a CFB riser with coarse meshes. This work is the continuation of formulating the subgrid-scale models for the space averaged two-fluid model equations which can be used in coarse mesh simulations of gas–solid flows in risers. In this study, the vertical component of the drag force and the convective term are analyzed and their dependence on the averaging size and solid volume fraction with the distance from the wall is presented.
Original languageEnglish
Pages (from-to)206-215
Number of pages10
JournalChemical Engineering Science
Volume89
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Flow of solids
Gases
Fluidized beds
Fluids
Drag
Volume fraction
Computer simulation

Keywords

  • Circulating fluidized bed
  • Computational fluid dynamics
  • Space averaging
  • Subgrid-scale models
  • Two-fluid model
  • Wall effects

Cite this

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title = "Wall effects on space averaged two-fluid model equations for simulations of gas-solid flows in risers",
abstract = "For the study of gas–solid flows in a circulating fluidized bed (CFB) riser, the model based on the Eulerian description of phases is widely used. Such a description requires the usage of a fine mesh and a short time step in the numerical simulations. Due to the constraint of long calculation times with fine meshes, it becomes practical to simulate the gas–solid flow in a CFB riser with coarse meshes. This work is the continuation of formulating the subgrid-scale models for the space averaged two-fluid model equations which can be used in coarse mesh simulations of gas–solid flows in risers. In this study, the vertical component of the drag force and the convective term are analyzed and their dependence on the averaging size and solid volume fraction with the distance from the wall is presented.",
keywords = "Circulating fluidized bed, Computational fluid dynamics, Space averaging, Subgrid-scale models, Two-fluid model, Wall effects",
author = "S. Shah and J. Ritvanen and T. Hypp{\"a}nen and Sirpa Kallio",
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language = "English",
volume = "89",
pages = "206--215",
journal = "Chemical Engineering Science",
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Wall effects on space averaged two-fluid model equations for simulations of gas-solid flows in risers. / Shah, S. (Corresponding Author); Ritvanen, J.; Hyppänen, T.; Kallio, Sirpa.

In: Chemical Engineering Science, Vol. 89, 2013, p. 206-215.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Wall effects on space averaged two-fluid model equations for simulations of gas-solid flows in risers

AU - Shah, S.

AU - Ritvanen, J.

AU - Hyppänen, T.

AU - Kallio, Sirpa

PY - 2013

Y1 - 2013

N2 - For the study of gas–solid flows in a circulating fluidized bed (CFB) riser, the model based on the Eulerian description of phases is widely used. Such a description requires the usage of a fine mesh and a short time step in the numerical simulations. Due to the constraint of long calculation times with fine meshes, it becomes practical to simulate the gas–solid flow in a CFB riser with coarse meshes. This work is the continuation of formulating the subgrid-scale models for the space averaged two-fluid model equations which can be used in coarse mesh simulations of gas–solid flows in risers. In this study, the vertical component of the drag force and the convective term are analyzed and their dependence on the averaging size and solid volume fraction with the distance from the wall is presented.

AB - For the study of gas–solid flows in a circulating fluidized bed (CFB) riser, the model based on the Eulerian description of phases is widely used. Such a description requires the usage of a fine mesh and a short time step in the numerical simulations. Due to the constraint of long calculation times with fine meshes, it becomes practical to simulate the gas–solid flow in a CFB riser with coarse meshes. This work is the continuation of formulating the subgrid-scale models for the space averaged two-fluid model equations which can be used in coarse mesh simulations of gas–solid flows in risers. In this study, the vertical component of the drag force and the convective term are analyzed and their dependence on the averaging size and solid volume fraction with the distance from the wall is presented.

KW - Circulating fluidized bed

KW - Computational fluid dynamics

KW - Space averaging

KW - Subgrid-scale models

KW - Two-fluid model

KW - Wall effects

U2 - 10.1016/j.ces.2012.11.020

DO - 10.1016/j.ces.2012.11.020

M3 - Article

VL - 89

SP - 206

EP - 215

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

ER -