Evaluation of the anisotropic radiative conductivity of a low-density carbon fiber material from realistic microscale imaging

Nima Nouri; Francesco Panerai; Kaveh A. Tagavi; Nagi N. Mansour; Alexandre Martin

doi:10.1016/j.ijheatmasstransfer.2015.12.004

Evaluation of the anisotropic radiative conductivity of a low-density carbon fiber material from realistic microscale imaging

Nima Nouri, Francesco Panerai, Kaveh A. Tagavi, Nagi N. Mansour, Alexandre Martin

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	535-539
Number of pages	5
Journal	International Journal of Heat and Mass Transfer
Volume	95
DOIs	https://doi.org/10.1016/j.ijheatmasstransfer.2015.12.004
State	Published - Apr 1 2016

Bibliographical note

Publisher Copyright:
© 2015 Elsevier Ltd. All rights reserved.

Funding

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.

Funders	Funder number
GCD
Kentucky Statewide EPSCoR
NASA Game Changing Development
National Aeronautics and Space Administration	NNX14AI97G, NNX13AN04A

Keywords

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

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10.1016/j.ijheatmasstransfer.2015.12.004

Cite this

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title = "Evaluation of the anisotropic radiative conductivity of a low-density carbon fiber material from realistic microscale imaging",

abstract = "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.",

keywords = "Effective conductivity, Porous media, Radiative conductivity, Radiative heat transfer, Thermal Protection Systems",

author = "Nima Nouri and Francesco Panerai and Tagavi, {Kaveh A.} and Mansour, {Nagi N.} and Alexandre Martin",

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T1 - Evaluation of the anisotropic radiative conductivity of a low-density carbon fiber material from realistic microscale imaging

AU - Nouri, Nima

AU - Panerai, Francesco

AU - Tagavi, Kaveh A.

AU - Mansour, Nagi N.

AU - Martin, Alexandre

PY - 2016/4/1

Y1 - 2016/4/1

N2 - 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.

AB - 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.

KW - Effective conductivity

KW - Porous media

KW - Radiative conductivity

KW - Radiative heat transfer

KW - Thermal Protection Systems

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VL - 95

SP - 535

EP - 539

JO - International Journal of Heat and Mass Transfer

JF - International Journal of Heat and Mass Transfer

ER -

Evaluation of the anisotropic radiative conductivity of a low-density carbon fiber material from realistic microscale imaging

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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