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Technical Briefs

A Nonequilibrium Thermal Model for Rapid Heating and Pyrolysis of Organic Composites

[+] Author and Article Information
Jianhua Zhou, J. K. Chen, D. E. Smith

Department of Mechanical and Aerospace Engineering, University of Missouri-Columbia, Columbia, MO 65211

Yuwen Zhang1

Department of Mechanical and Aerospace Engineering, University of Missouri-Columbia, Columbia, MO 65211zhangyu@missouri.edu

1

Corresponding author.

J. Heat Transfer 130(6), 064501 (Apr 23, 2008) (4 pages) doi:10.1115/1.2897337 History: Received January 18, 2007; Revised August 16, 2007; Published April 23, 2008

A nonequilibrium thermal model is developed to predict the through-thickness transient temperature variation in organic composites subjected to intensive heating. In addition to heat conduction, the model incorporates four important mechanisms: rate-dependent pyrolysis, pyrolysis by-product outgassing, irradiance-dependent convection heat loss, and radiation heat lose. Both the shape of the gas flow channel and the gas addition velocity from the channel wall are evaluated based on the decomposition reaction rate. The through-thickness temperature transients, the continually changing gas channel, and the pressure distribution in the decomposition gas are obtained and discussed.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Physical model: (a) before heating: (b) after the commencement of heating: (c) zoom-out of a fiber-matrix element

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Figure 2

Progression of the pyrolysis front with time

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Figure 3

Spatial distribution of the temperature at different times

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Figure 4

Centerline normalized pressure distribution for different heating fluxes

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