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ASTM Selected Technical Papers
Insulation Materials: Testing and Applications: 4th Volume
By
AO Desjarlais
AO Desjarlais
1
Oak Ridge National Laboratory
?
Oak Ridge, TN
Search for other works by this author on:
RR Zarr
RR Zarr
2
National Institute of Standards and Technology
?
Gaithersburg, MD
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ISBN-10:
0-8031-2898-3
ISBN:
978-0-8031-2898-9
No. of Pages:
427
Publisher:
ASTM International
Publication date:
2002

Thermal physical (thermal diffusivity and conductivity) and optical (attenuation, absorption and scattering) properties of alumina fiber insulation materials were measured. The measurements of apparent thermophysical properties are based on the method of heating of plate specimens at a constant rate. The determination of the conductive and the radiative components of apparent properties is based on the combined radiative-conductive heat transfer theory (RCHT) and the measurement of optical properties.

The significant influence of the heat radiation component on the apparent thermal physical properties is demonstrated. Other heat transfer mechanisms that affect the apparent thermal conductivity are also analyzed. Limitations of standard methods for measurement of apparent thermal physical properties of semitransparent fiber materials, including anisotropic materials, are discussed.

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