Effect of particle shape and size on effective thermal conductivity of packed beds

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)

Abstract

Effective thermal conductivity (ETC) is one of the most important thermal properties of packed granular materials, and is affected significantly by particle properties. In this work, discrete element method is used to study the effect of particle shape and size on the ETC of packed beds with ellipsoidal particles. The simulated ETC results are verified by experimental data with a good agreement. It is revealed that for coarse particles, the bed ETC increases with aspect ratio of ellipsoids deviating from 1.0. But for fine particles, the effect of aspect ratio becomes less significant. Such an effect is closely related to the difference of packing structures of ellipsoids at different sizes and aspect ratios. The results also reveal that at low particle thermal conductivity, the ETC is not affected much by particle size; at high particle thermal conductivity, the ETC increases with particle size. When bed temperature increases, the ETC increases markedly. The contributions of different heat conduction paths under different conditions are also quantified.

Original languageEnglish
Pages (from-to)157-166
Number of pages10
JournalPowder Technology
Volume311
DOIs
Publication statusPublished - 15 Apr 2017

Keywords

  • Discrete element method
  • Effective thermal conductivity
  • Ellipsoids
  • Heat transfer
  • Packed beds

Cite this

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title = "Effect of particle shape and size on effective thermal conductivity of packed beds",
abstract = "Effective thermal conductivity (ETC) is one of the most important thermal properties of packed granular materials, and is affected significantly by particle properties. In this work, discrete element method is used to study the effect of particle shape and size on the ETC of packed beds with ellipsoidal particles. The simulated ETC results are verified by experimental data with a good agreement. It is revealed that for coarse particles, the bed ETC increases with aspect ratio of ellipsoids deviating from 1.0. But for fine particles, the effect of aspect ratio becomes less significant. Such an effect is closely related to the difference of packing structures of ellipsoids at different sizes and aspect ratios. The results also reveal that at low particle thermal conductivity, the ETC is not affected much by particle size; at high particle thermal conductivity, the ETC increases with particle size. When bed temperature increases, the ETC increases markedly. The contributions of different heat conduction paths under different conditions are also quantified.",
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Effect of particle shape and size on effective thermal conductivity of packed beds. / Gan, Jieqing; Zhou, Zongyan; Yu, Aibing.

In: Powder Technology, Vol. 311, 15.04.2017, p. 157-166.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Effect of particle shape and size on effective thermal conductivity of packed beds

AU - Gan, Jieqing

AU - Zhou, Zongyan

AU - Yu, Aibing

PY - 2017/4/15

Y1 - 2017/4/15

N2 - Effective thermal conductivity (ETC) is one of the most important thermal properties of packed granular materials, and is affected significantly by particle properties. In this work, discrete element method is used to study the effect of particle shape and size on the ETC of packed beds with ellipsoidal particles. The simulated ETC results are verified by experimental data with a good agreement. It is revealed that for coarse particles, the bed ETC increases with aspect ratio of ellipsoids deviating from 1.0. But for fine particles, the effect of aspect ratio becomes less significant. Such an effect is closely related to the difference of packing structures of ellipsoids at different sizes and aspect ratios. The results also reveal that at low particle thermal conductivity, the ETC is not affected much by particle size; at high particle thermal conductivity, the ETC increases with particle size. When bed temperature increases, the ETC increases markedly. The contributions of different heat conduction paths under different conditions are also quantified.

AB - Effective thermal conductivity (ETC) is one of the most important thermal properties of packed granular materials, and is affected significantly by particle properties. In this work, discrete element method is used to study the effect of particle shape and size on the ETC of packed beds with ellipsoidal particles. The simulated ETC results are verified by experimental data with a good agreement. It is revealed that for coarse particles, the bed ETC increases with aspect ratio of ellipsoids deviating from 1.0. But for fine particles, the effect of aspect ratio becomes less significant. Such an effect is closely related to the difference of packing structures of ellipsoids at different sizes and aspect ratios. The results also reveal that at low particle thermal conductivity, the ETC is not affected much by particle size; at high particle thermal conductivity, the ETC increases with particle size. When bed temperature increases, the ETC increases markedly. The contributions of different heat conduction paths under different conditions are also quantified.

KW - Discrete element method

KW - Effective thermal conductivity

KW - Ellipsoids

KW - Heat transfer

KW - Packed beds

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