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Behavior of charring materials in simulated fire environments

Author: Eric M Suuberg; I Milosavljevic; W D Lilly; Building and Fire Research Laboratory (U.S.); Brown University. Division of Engineering.
Publisher: Gaithersburg, MD : U.S. Dept. of Commerce, National Institute of Standards and Technology, 1994.
Series: NIST-GCR-, 94-645.
Edition/Format:   Book : National government publication : English
Database:WorldCat
Summary:
The focus of this study was the behavior of thick charring solids in fire situations. Clearly one of the most important parameters governing the fire phenomenon is the rate of release of combustible volatiles into the gas phase, in which they actually burn. Over the years, fire researchers have learned how to model the processes in the gas phase, so that the rate of heat feedback to the solid surface can be  Read more...
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Details

Genre/Form: Electronic books
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Eric M Suuberg; I Milosavljevic; W D Lilly; Building and Fire Research Laboratory (U.S.); Brown University. Division of Engineering.
OCLC Number: 31299560
Notes: "January 1994."
"Issued June 1994."
Key words: cellulose; cellulosic materials; char; char depth; fire research; model studies; pyrolysis.
Description: lviii, 592 p. : ill. ; 28 cm.
Contents: Structure and properties of cellulose --
Experimental investigation on cellulose pyrolysis --
Chemical models of cellulose pyrolysis --
Mathematical modeling of bulk material pyrolysis --
Materials --
Simulated fire apparatus --
Heated wire mesh, TGA and DSC studies --
Thermal properties measurement --
Thermal properties --
Heat capacity --
Thermal diffusivity --
Thermal conductivity --
Surface emissivity --
Heat transfer coefficient --
Behavior of cellulose in a simulated fire environment --
The effect of initial sample density --
Incident heat flux effect --
Mass and temperature normalization --
Initial sample thickness effect --
"Grain" orientation effect --
The purge gas effect --
Material balance --
Products characterization --
The kinetics and thermodynamics of cellulose pyrolysis --
Char yield --
Heat effect of pyrolysis --
Kinetics of pyrolysis --
Mathematical model of infinite slab pyrolysis --
Assumptions --
Model equations and boundary conditions --
Modifications to the original model --
Model predictions --
Model sensitivity.
Series Title: NIST-GCR-, 94-645.
Responsibility: E.M. Suuberg, I. Milosavljevic, W.D. Lilly.

Abstract:

The focus of this study was the behavior of thick charring solids in fire situations. Clearly one of the most important parameters governing the fire phenomenon is the rate of release of combustible volatiles into the gas phase, in which they actually burn. Over the years, fire researchers have learned how to model the processes in the gas phase, so that the rate of heat feedback to the solid surface can be reasonably well predicted. Likewise, there exists the ability to model the heat transfer processes at the solid surface and within the solid itself Finally, there is a large literature on the laboratory-scale pyrolysis of various charring polymers. It might appear that predicting the course of the fire would involve carefully coupling these different models together. There have unfortunately not been any successful demonstrations of the ability to do this, though in broad stroke, some mode is capture the key features of the processes. This study was concerned with the possibility that the inability to come to complete closure on the charring polymer fire problem might derive from difficulties in applying laboratory scale kinetics to actual fire conditions. Specifically, we were concerned about how well small scale laboratory experiments used to derive the kinetics of pyrolysis could be used to predict the behavior of charring solids in fire situations.

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