Use of an electric heater as an idealized firebrand to determine ignition delay time of Eucalyptus globulus leaves

Article Engineering, Civil

Cooperative spot ignition by idealized firebrands: Impact of thermal interaction in the fuel

Luqing Zhu et al.

Summary: Firebrand spotting is a significant factor in structure losses during WUI fires. Experimental and numerical studies can help understand the critical conditions for firebrand accumulation and provide guidance for reducing fire damage.

FIRE SAFETY JOURNAL (2023)

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Article Engineering, Civil

Analysis of the thermal exposure and ignition propensity of a lignocellulosic building material subjected to a controlled deposition of glowing firebrands

Jacques A. De Beer et al.

Summary: A series of experiments were conducted to investigate the ignition probability and heat release rate of firebrand piles deposited on flammable and non-flammable substrates. The results showed that the ignition probability of the substrate increased with the increase of air flow velocity and firebrand coverage density, while it decreased with further increase in air flow. The contribution of the firebrand pile to the heat release rate was found to be larger than that of the substrate.

FIRE SAFETY JOURNAL (2023)

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Article Thermodynamics

A simplified analytical model for radiation dominated ignition of solid fuels exposed to multiple non-steady heat fluxes

Roberto Parot et al.

Summary: This study proposes a general model to predict the ignition delay time of solid fuels under different fire conditions. Four different heat flux behaviors are considered, and both exact and approximate solutions are provided. The model shows good adaptability when dealing with high heat fluxes.

COMBUSTION AND FLAME (2022)

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Article Engineering, Civil

Localized heat transfer from firebrands to surfaces

Elias D. Bearinger et al.

Summary: High resolution heat flux distributions of single firebrands with different geometries were measured using IR thermography and inverse heat transfer analysis in this study. It was found that localized heat flux from a single firebrand was 2-6 times higher than previous methods of heat flux measurement. Firebrand geometry, wind speed, and wind speed orientation relative to the firebrand were identified as factors affecting the heat flux magnitude and exposure duration.

FIRE SAFETY JOURNAL (2021)

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Article Engineering, Civil

Effect of firebrand size and geometry on heating from a smoldering pile under wind

Zhenxiang Tao et al.

Summary: This study investigated the influence of firebrand size and makeup on heating from a pile to a recipient surface, finding that realistic fuels achieved higher peak heat fluxes.

FIRE SAFETY JOURNAL (2021)

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Article Engineering, Civil

Ignition of wildland fuels by idealized firebrands

J. Rivera et al.

Summary: Experiments were conducted using the Idealized-Firebrand Ignition Test (I-FIT) apparatus to simulate the ignition of forest fuel layers. The study found that the theoretical model and experimental data were consistent, providing relevant parameters for the characteristics of forest fuel layers.

FIRE SAFETY JOURNAL (2021)

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Article Thermodynamics

Thermal dynamics of deposited firebrands using phosphor thermometry

Yasin M. Abul-Huda et al.

Summary: This study investigates the thermal mechanisms governing the ignition propensity of firebrands using temperature-sensitive phosphorescence. It finds that the large difference in contact temperatures is significant for ignition, and secondary heating events can lead to peak net heat flux equivalent to 70% of the initial deposition. Additionally, the paper discusses the presence of unimodal and bimodal contact temperature distributions.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2021)

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Article Engineering, Civil