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Article
Three Dimensional Radiative Heat Transfer Model for the Evaluation of the Anisotropic Effective Conductivity of Fibrous Materials
International Journal of Heat and Mass Transfer (2015)
  • Nima Nouri, University of Kentucky
  • Alexandre Martin, University of Kentucky
Abstract

The effective radiative conductivity of fibrous material is an important part of the evaluation of the thermal performance of fibrous insulators. To better evaluate this material property, a three-dimensional direct simulation model which calculates the effective radiative conductivity of fibrous material is proposed. The simplified model assumes that the fibers are in a cylindrical shape and does not require identically-sized fibers or a symmetric configuration. Using a geometry with properties resembling those of a fibrous insulator, a numerical calculation of the geometric configuration factor is carried out. The results show the dependency of thermal conductivity on temperature as well as the orientation of the fibers. The calculated conductivity values are also used in the continuum heat equation, and the results are compared to the ones obtained using the direct simulation approach, showing a good agreement.

Keywords
  • Fibrous geometry,
  • Anisotropic conductivity,
  • Effective conductivity,
  • Radiative heat transfer,
  • Ablation
Publication Date
April, 2015
Citation Information
Nima Nouri and Alexandre Martin. "Three Dimensional Radiative Heat Transfer Model for the Evaluation of the Anisotropic Effective Conductivity of Fibrous Materials" International Journal of Heat and Mass Transfer Vol. 83 (2015)
Available at: http://works.bepress.com/alexandre_martin/28/