Determining key variables of the kinetic theory of granular flow using DWS

V. Zivkovic, K. Berry, D. H. Glass, M. J. Biggs

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The granular temperature, pressure and viscosity are three key variables that underpin the kinetic theory of granular flows while they are also playing an increasing role in other contexts such as modelling heat transfer, segregation, erosion, attrition and aggregation in various granular processing technologies. The scarcity of experimental measurements of these quantities is a significant barrier to exploitation of these theories and models. Diffusing wave spectroscopy (DWS) is now a well-established technique for measurement of granular temperature in dense granular systems. Using a liquid-fluidized bed as a test-case, we demonstrate here that DWS can be used to obtain the granular temperature and, via kinetic theory of granular flow expressions for the granular pressure and viscosity. The determined granular temperature and pressure variation with solids fraction compares well with theoretical results of others. The analysis also shows that the granular viscosity estimates obtained from the various kinetic theory models available vary significantly, particularly qualitatively at the low coefficients of restitution thought typical of liquid fluidized beds.

Original languageEnglish
Title of host publicationPowders and Grains 2013
Subtitle of host publicationProceedings of the 7th International Conference on Micromechanics of Granular Media
PublisherAIP Publishing
Pages1266-1269
Number of pages4
ISBN (Print)9780735411661
DOIs
Publication statusPublished - 2013
Event7th International Conference on Micromechanics of Granular Media: Powders and Grains 2013 - Sydney, NSW, Australia
Duration: 8 Jul 201312 Jul 2013

Publication series

NameAIP Conference Proceedings
Volume1542
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference7th International Conference on Micromechanics of Granular Media: Powders and Grains 2013
CountryAustralia
CitySydney, NSW
Period8/07/1312/07/13

Keywords

  • Diffusing Wave Spectroscopy
  • Granular pressure
  • Granular temperature
  • Granular viscosity
  • Kinetic theory

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Zivkovic, V., Berry, K., Glass, D. H., & Biggs, M. J. (2013). Determining key variables of the kinetic theory of granular flow using DWS. In Powders and Grains 2013: Proceedings of the 7th International Conference on Micromechanics of Granular Media (pp. 1266-1269). (AIP Conference Proceedings; Vol. 1542). AIP Publishing. https://doi.org/10.1063/1.4812169