CFD modeling and analysis of the multiphase flow and performance of dense medium cyclones

Shibo Kuang, Zheng Qi, Aibing Yu, Andrew Vince, Geoffrey D Barnett, Peter J Barnett

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A computational fluid dynamics (CFD) model is proposed to describe the multiphase flow in a dense-medium cyclone (DMC). In this model, the volume of fluid (VOF) multiphase model is first used to determine the initial shape and position of the air core, and then the so called mixture model is employed to describe the flows of the medium, coal particles and air, where the turbulence is described by the Reynolds stress model. The validity of the proposed approach is verified by the reasonably good agreement between the measured and calculated results in terms of separation efficiency. On this base, this model is used to quantify the effects of the ratios of spigot to vortex finder diameters (U:O) and medium to coal (M:C) on performance. The results are shown to be generally comparable to those reported in the literature. It reveals that when vortex finder or spigot diameter is varied at the same U:O ratio, the offset and medium split nearly remain the same, however, the coal feed rate and Ep are different under the conditions considered. It is also shown that the fish-hook phenomenon is observed when spigot diameter is equal to or slightly larger than vortex finder diameter, and a normal operation becomes less stable with decreasing U:O ratio. The key phenomena predicted are explained by the calculated inner flows.
Original languageEnglish
Pages (from-to)43-54
Number of pages12
JournalMinerals Engineering
Volume62
DOIs
Publication statusPublished - Jul 2014
Externally publishedYes

Keywords

  • Dense medium cyclone
  • Multiphase flow
  • Separation
  • Modeling and simulation
  • Coal preparation

Cite this

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title = "CFD modeling and analysis of the multiphase flow and performance of dense medium cyclones",
abstract = "A computational fluid dynamics (CFD) model is proposed to describe the multiphase flow in a dense-medium cyclone (DMC). In this model, the volume of fluid (VOF) multiphase model is first used to determine the initial shape and position of the air core, and then the so called mixture model is employed to describe the flows of the medium, coal particles and air, where the turbulence is described by the Reynolds stress model. The validity of the proposed approach is verified by the reasonably good agreement between the measured and calculated results in terms of separation efficiency. On this base, this model is used to quantify the effects of the ratios of spigot to vortex finder diameters (U:O) and medium to coal (M:C) on performance. The results are shown to be generally comparable to those reported in the literature. It reveals that when vortex finder or spigot diameter is varied at the same U:O ratio, the offset and medium split nearly remain the same, however, the coal feed rate and Ep are different under the conditions considered. It is also shown that the fish-hook phenomenon is observed when spigot diameter is equal to or slightly larger than vortex finder diameter, and a normal operation becomes less stable with decreasing U:O ratio. The key phenomena predicted are explained by the calculated inner flows.",
keywords = "Dense medium cyclone, Multiphase flow, Separation, Modeling and simulation, Coal preparation",
author = "Shibo Kuang and Zheng Qi and Aibing Yu and Andrew Vince and Barnett, {Geoffrey D} and Barnett, {Peter J}",
year = "2014",
month = "7",
doi = "10.1016/j.mineng.2013.10.012",
language = "English",
volume = "62",
pages = "43--54",
journal = "Minerals Engineering",
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}

CFD modeling and analysis of the multiphase flow and performance of dense medium cyclones. / Kuang, Shibo; Qi, Zheng; Yu, Aibing; Vince, Andrew; Barnett, Geoffrey D; Barnett, Peter J.

In: Minerals Engineering, Vol. 62, 07.2014, p. 43-54.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - CFD modeling and analysis of the multiphase flow and performance of dense medium cyclones

AU - Kuang, Shibo

AU - Qi, Zheng

AU - Yu, Aibing

AU - Vince, Andrew

AU - Barnett, Geoffrey D

AU - Barnett, Peter J

PY - 2014/7

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N2 - A computational fluid dynamics (CFD) model is proposed to describe the multiphase flow in a dense-medium cyclone (DMC). In this model, the volume of fluid (VOF) multiphase model is first used to determine the initial shape and position of the air core, and then the so called mixture model is employed to describe the flows of the medium, coal particles and air, where the turbulence is described by the Reynolds stress model. The validity of the proposed approach is verified by the reasonably good agreement between the measured and calculated results in terms of separation efficiency. On this base, this model is used to quantify the effects of the ratios of spigot to vortex finder diameters (U:O) and medium to coal (M:C) on performance. The results are shown to be generally comparable to those reported in the literature. It reveals that when vortex finder or spigot diameter is varied at the same U:O ratio, the offset and medium split nearly remain the same, however, the coal feed rate and Ep are different under the conditions considered. It is also shown that the fish-hook phenomenon is observed when spigot diameter is equal to or slightly larger than vortex finder diameter, and a normal operation becomes less stable with decreasing U:O ratio. The key phenomena predicted are explained by the calculated inner flows.

AB - A computational fluid dynamics (CFD) model is proposed to describe the multiphase flow in a dense-medium cyclone (DMC). In this model, the volume of fluid (VOF) multiphase model is first used to determine the initial shape and position of the air core, and then the so called mixture model is employed to describe the flows of the medium, coal particles and air, where the turbulence is described by the Reynolds stress model. The validity of the proposed approach is verified by the reasonably good agreement between the measured and calculated results in terms of separation efficiency. On this base, this model is used to quantify the effects of the ratios of spigot to vortex finder diameters (U:O) and medium to coal (M:C) on performance. The results are shown to be generally comparable to those reported in the literature. It reveals that when vortex finder or spigot diameter is varied at the same U:O ratio, the offset and medium split nearly remain the same, however, the coal feed rate and Ep are different under the conditions considered. It is also shown that the fish-hook phenomenon is observed when spigot diameter is equal to or slightly larger than vortex finder diameter, and a normal operation becomes less stable with decreasing U:O ratio. The key phenomena predicted are explained by the calculated inner flows.

KW - Dense medium cyclone

KW - Multiphase flow

KW - Separation

KW - Modeling and simulation

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