Thermal and calorimetric investigations of some vegetative fuels

IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Fire and Materials Pub Date : 2024-05-05 DOI:10.1002/fam.3211
Khalid Moinuddin, Malavika Arun, Alex Filkov, Paul Joseph, Maurice Guerrieri
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Abstract

Bushfires pose a significant threat to numerous countries, often causing vast property damages and loss of lives. Efforts to combat and manage these fires heavily rely on predicting the fires' rate of spread and intensity. A significant component of these predictions involves understanding the thermophysical characteristics of vegetative fuels. The accuracy of predictive models (especially physical models) also depends on obtaining precise thermophysical and combustion parameters. This research aims to provide a comprehensive set of thermal degradation and combustion parameters for surface and near-surface fuel samples collected during prescribed fire experiment conducted in April 2022 in Little Desert National Park, Victoria, Australia. Firstly, fuel properties like fuel height, moisture content, bulk density, fuel load and heat of combustion were meticulously characterized for both surface and near-surface samples. Then activation energies for degradation reactions were determined using the Flynn–Wall–Ozawa method and for the determination of pre-exponential factors, in most cases these reactions closely aligned with a Second order model. This was followed by determination of other parameters such as heat of reaction, specific heat and conductivity. It was found that the density, activation energy and heat of combustion did not vary significantly across the six samples under question. The comprehensive set of obtained parameters will likely help to facilitate better predictions in fire propagation modelling.

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一些植物燃料的热学和热量测定研究
丛林大火对许多国家构成了重大威胁,经常造成巨大的财产损失和人员伤亡。扑灭和管理这些火灾的努力在很大程度上依赖于对火灾蔓延速度和强度的预测。这些预测的一个重要组成部分是了解植被燃料的热物理特性。预测模型(尤其是物理模型)的准确性也取决于能否获得精确的热物理和燃烧参数。本研究旨在为 2022 年 4 月在澳大利亚维多利亚州小沙漠国家公园进行的处方火实验中采集的地表和近地表燃料样本提供一套全面的热降解和燃烧参数。首先,对地表和近地表样本的燃料特性,如燃料高度、含水量、体积密度、燃料负荷和燃烧热进行了细致的表征。然后使用 Flynn-Wall-Ozawa 方法确定降解反应的活化能,并确定前指数因子,在大多数情况下,这些反应与二阶模型密切相关。随后确定了其他参数,如反应热、比热和电导率。结果发现,六种样品的密度、活化能和燃烧热变化不大。所获得的一整套参数可能有助于更好地预测火灾传播模型。
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来源期刊
Fire and Materials
Fire and Materials 工程技术-材料科学:综合
CiteScore
4.60
自引率
5.30%
发文量
72
审稿时长
3 months
期刊介绍: Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals. Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.
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