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Origin and justification of the use of the arrhenius relation to represent the reaction rate of the thermal decomposition of a solid

Batiot, B; Rogaume, T; Richard, F; Luche, J; Collin, A; Guillaume, E; Torero, JL; (2021) Origin and justification of the use of the arrhenius relation to represent the reaction rate of the thermal decomposition of a solid. Applied Sciences , 11 (9) , Article 4075. 10.3390/app11094075. Green open access

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Abstract

Degradation models are commonly used to describe the generation of combustible gases when predicting fire behavior. A model may include many sub-models, such as heat and mass transfer models, pyrolysis models or mechanical models. The pyrolysis sub-models require the definition of a decomposition mechanism and the associated reaction rates. Arrhenius-type equations are commonly used to quantify the reaction rates. Arrhenius-type equations allow the representation of chemical decomposition as a function of temperature. This representation of the reaction rate originated from the study of gas-phase reactions, but it has been extrapolated to liquid and solid decomposition. Its extension to solid degradation needs to be justified because using an Arrhenius-type formulation implies important simplifications that are potentially questionable. This study describes these simplifications and their potential consequences when it comes to the quantification of solid-phase reaction rates. Furthermore, a critical analysis of the existing thermal degradation models is presented to evaluate the implications of using an Arrhenius-type equation to quantify mass-loss rates and gaseous fuel production for fire predictions.

Type: Article
Title: Origin and justification of the use of the arrhenius relation to represent the reaction rate of the thermal decomposition of a solid
Open access status: An open access version is available from UCL Discovery
DOI: 10.3390/app11094075
Publisher version: http://dx.doi.org/10.3390/app11094075
Language: English
Additional information: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Arrhenius; solid kinetics; thermal degradation; modeling
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10128482
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