The radiative heat transfer inside a low-density carbon fiber insulator is analyzed using a three-dimensional direct simulation model. A robust procedure is presented for the numerical calculation of the geometric configuration factor to compute the radiative energy exchange processes among the small discretized surface areas of the fibrous material. The methodology is applied to a polygonal mesh of a fibrous insulator obtained from three-dimensional microscale imaging of the real material. The anisotropic values of the radiative conductivity are calculated for that geometry. The results yield both directional and thermal dependence of the radiative conductivity. The combined value of radiative and solid conductivity are compared to experimental data available in the literature, and show excellent agreement.
|Number of pages||5|
|Journal||International Journal of Heat and Mass Transfer|
|State||Published - Apr 1 2016|
Bibliographical noteFunding Information:
The authors gratefully acknowledge the support of B. Plaster regarding this work. Financial support was provided by Kentucky EPSCoR and NASA RA Award NNX13AN04A and NASA Award NNX14AI97G. Part of this work was also performed under the Entry System Modeling Project (M.J. Wright program manager) of the NASA Game Changing Development (GCD) Program. Finally, the authors are also indebted to T. Cochell for pointing out the published experimental data, K. Bensassi and A. Munafo for providing helpful comments, and J.F. Wenk for a very helpful conversation on principal axis.
© 2015 Elsevier Ltd. All rights reserved.
- Effective conductivity
- Porous media
- Radiative conductivity
- Radiative heat transfer
- Thermal Protection Systems
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes