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Related Experiment Video

Updated: Nov 19, 2025

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

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Published on: June 1, 2016

Thermal Model for Timber Fire Exposure with Moving Boundary.

Stanislav Šulc¹, Vít Šmilauer¹, František Wald²

¹Faculty of Civil Engineering, Department of Mechanics, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic.

Materials (Basel, Switzerland)

|February 3, 2021

Summary

This study introduces a new heat transport model for timber fires. It accounts for charring and burnout, improving accuracy in predicting timber

Keywords:

adiabatic surface temperature advancing front burnout charring rate model moving boundary condition timber

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Area of Science:

Engineering
Materials Science
Fire Safety Engineering

Background:

Timber's response to fire involves charring, cracking, and burnout, affecting thermal load distribution.
Existing models often use initial geometry, overestimating char insulation and underestimating burnout.

Purpose of the Study:

To present an advanced heat transport model for timber fires.
To incorporate a moving boundary condition, element deactivation, and internal heat source.

Main Methods:

Developed a heat transport model with a moving boundary condition.
Included a criterion for finite element deactivation.
Incorporated an internal heat source.

Main Results:

The moving boundary condition significantly impacts models after ~10 minutes of fire exposure.
The model accurately predicts a constant charring rate, aligning with experimental observations.

Conclusions:

The proposed model enhances the accuracy of predicting timber behavior under fire conditions.
Accounting for geometric changes (moving boundary) is crucial for realistic fire resistance analysis.