Origin and Justification of the Use of the Arrhenius Relation to Represent the Reaction Rate of the Thermal Decomposition of a Solid

Batiot, Benjamin; Rogaume, Thomas; Richard, Franck; Luche, Jocelyn; Guillaume, Éric; Torero, José L.

doi:10.3390/app11094075

Cited by 12 publications

(3 citation statements)

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“…In FDS, the pyrolysis model, and consequently the chemical kinetics involved, can be considered infinitely fast or obey an Arrhenius rate law (McGrattan et al 2022). The Arrhenius rate law defines a finite-rate reaction where the temperaturedependent reactions are characterised and based on the activation energy and Boltzmann distribution (Batiot et al 2021).…”

Section: Methodsmentioning

confidence: 99%

Parametric evaluation of heat transfer mechanisms in a WUI fire scenario

Fiorini

Craveiro

Santiago

et al. 2023

Int. J. Wildland Fire

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Background Wildland–urban interface (WUI) fires are becoming more frequent and catastrophic as they are associated with the effects of climate change, demographic pressure, human activities, abandonment of rural areas and activities promoting dangerous fuel continuity. For example, in the central regions of Portugal, Chile and California, severe direct and indirect impacts have been observed, with a catastrophic number of fatalities. Aims Mitigating and reducing the impacts of wildfires in the WUI requires understanding heat transfer mechanisms from forest fires and understanding how structures ignite is crucial to define and implement new mitigation strategies. Methods Adopting Computational Fluid Dynamics is essential to assess the WUI fire problem by simulating fire behaviour and quantifying its characteristics. In this paper, a building is exposed to several wildfire scenarios, assessing the influence of parameters such as materials, fuels, topography and meteorological conditions. Key results The investigated scenarios were developed considering validated Fire Dynamics Simulator (FDS) models of single trees on fire and the influence of governing parameters was quantified. Conclusions For the selected scenarios, the impacts on the building were assessed and compared, quantifying heat release rates, radiative heat flux and adiabatic surface temperature. Implications This research contributes to a Performance-Based Design (PBD) approach for buildings in the WUI.

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Section: Methodsmentioning

confidence: 99%

Parametric evaluation of heat transfer mechanisms in a WUI fire scenario

Fiorini

Craveiro

Santiago

et al. 2023

Int. J. Wildland Fire

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“…(3.a), when they are employed in solid-solid reactions (Galwey and Brown 2002;Galwey 2006;L'vov 2017). Batiot et al (2021) provide a thorough analysis of the nature of the Arrhenius-type form of the rate constant, using a general approach relying on fundamentals of statistical mechanics. Altogether, the idea is commonly shared that a transformation from B to C is related to the occurrence of an ( 2) PROOF activated state (complex) B ‡ that is intermediate between the other two.…”

Section: Proofmentioning

confidence: 99%

High-temperature ramsdellite–pyrolusite transformation kinetics

et al. 2021

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The two most common polymorphs of MnO 2 , ramsdellite and pyrolusite, are often found in natural association. Our starting sample is from the Mistake mine (Arizona) containing macroscopic crystals of both ramsdellite (a = 4.5131( 6), b = 9.2689(13), c = 2.8610(4) Å, V = 119.69(3) Å 3 ; S.G. Pbmn) and pyrolusite (a = 4.4030(2), c = 2.87392(16) Å, V = 55.715(5) Å 3 ; S.G. P4 2 /mnm), along with a smaller amount of "groutellite". A mixed powder was used to study the ramsdellite→pyrolusite transformation by in situ high-temperature X-ray powder diffraction. Our results reveal that this transformation is not a direct transition, but it occurs in two steps, as a function of temperature; ramsdellite transforms into an amorphous phase, which then recrystallizes into pyrolusite. Amorphization of ramsdellite and crystallization of pyrolusite kinetics were studied by the universal equation for solid-solid reactions. The two activation energies are comparable, but the pre-exponential factor of the ramsdellite amorphization is two orders of magnitude larger than pyrolusite crystallization's. As a consequence, ramsdellite→pyrolusite transformation implies the formation of an amorphous transition, due to a mismatch between the conversion rates, that reaches its maximum at around 630 K and then decreases at higher T, when pyrolusite crystallization is strongly promoted.

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“…Recent works have demonstrated the importance to consider with a detailed approach the thermal decomposition since it represents the source term of all combustion process of the solid fuels. Thus, Batiot et al [1] demonstrated that the Arrhenius relation, developed for gas combustibles, can be applied in the solid phase in order to describe the kinetics of the thermal decomposition of solid fuels. These authors also presented a critical analysis of the existing thermal degradation models to evaluate the implications of using an Arrheniustype equation to quantify mass-loss rates and gaseous fuel production for fire predictions.…”

mentioning

confidence: 99%