Analysis of Effective Thermal Properties of Thermall Thick Materials

Published

July 1, 2003

Author(s)

Frederick W. Mowrer

Abstract

The standard methods used to derive effective thermal properties of thermally thick materials based on bench-scale radiant exposure tests are reviewed and analyzed. These methods are compared with numerical calculations for the same boundary conditions. These comparisons show that the standard analytical methods for predicting surface temperature histories are not accurate because they either ignore heat losses from the surface or do not adequately treat the highly nonlinear reradiative surface heat loss term. A method is presented for determining more accurate values for the thermal inertia based on effective values for this term published widely in the literature. It is found that actual thermal inertias tend to be lower by about a factor of 1.3 to 2.7 when compared with reported effective values for a wide range of conditions. This can have a significant effect on flame spread predictions for models that rely on accurate values for the thermal inertia.

Citation

Grant/Contract Reports (NISTGCR) - 03-855

Report Number

03-855

NIST Pub Series

Grant/Contract Reports (NISTGCR)

Pub Type

NIST Pubs

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Keywords

thermal properties, ignition, thermial inertia

Citation

Mowrer, F. (2003), Analysis of Effective Thermal Properties of Thermall Thick Materials, Grant/Contract Reports (NISTGCR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916639 (Accessed October 30, 2025)