Stress-dependent thermal conductivity evolution of granular materials

Jinhyun Choo, Jung Hwoon Lee, Jangguen Lee, Young Seok Kim, Tae Sup Yun

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

2 Citations (Scopus)

Abstract

Thermal conduction in granular materials is mainly dominated by volumetric fraction of constituents, minerals that consist of grains, grain size distribution, and fine contents. Even though widely used empirical and semi-empirical correlations for thermal conductivity of granular materials capture these governing factors, the effect of applied stress appears overlooked and is rarely incorporated into the thermal estimation. This study presents the stress-dependent thermal conductivity evolution of granular materials using the discrete element method (DEM) in conjunction with the 3D thermal network model. A series of loading (loading, unloading, and reloading) is applied under isotropic stress and K0 conditions for the numerically synthesized assemblies whose grain size distribution varies. Results highlights that not only the effective thermal conductivity increases nonlinearly with stress and but also its incremental ratio varies with the stress in the direction through which heat flow takes place. The nonlinear anisotropic increase and engineering implications of stress-dependent thermal conduction are discussed.

Original languageEnglish
Title of host publicationGeoCongress 2012
Subtitle of host publicationState of the Art and Practice in Geotechnical Engineering
Pages4486-4494
Number of pages9
Edition225 GSP
DOIs
Publication statusPublished - 2012 Dec 1
EventGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering - Oakland, CA, United States
Duration: 2012 Mar 252012 Mar 29

Publication series

NameGeotechnical Special Publication
Number225 GSP
ISSN (Print)0895-0563

Other

OtherGeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
CountryUnited States
CityOakland, CA
Period12/3/2512/3/29

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Choo, J., Lee, J. H., Lee, J., Kim, Y. S., & Yun, T. S. (2012). Stress-dependent thermal conductivity evolution of granular materials. In GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering (225 GSP ed., pp. 4486-4494). (Geotechnical Special Publication; No. 225 GSP). https://doi.org/10.1061/9780784412121.461