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Title: Smoldering and flaming of disc wood particles under external radiation : autoignition and size effect
Authors: Wang, S
Ding, P
Lin, S 
Gong, J
Huang, X 
Issue Date: Jul-2021
Source: Frontiers in mechanical engineering, July 2021, v. 7, 686638
Abstract: Wildfires are global issues that cause severe damages to the society and environment. Wood particles and firebrands are the most common fuels in wildfires, but the size effect on the flaming and smoldering ignitions as well as the subsequent burning behavior is still poorly understood. In this work, a well-controlled experiment was performed to investigate smoldering and flaming ignitions of stationary disc-shaped wood particles with different diameters (25–60 mm) and thicknesses (15–25 mm) under varying radiant heat flux. The ignition difficulty, in terms of the minimum heat flux, increases from smoldering ignition to piloted flaming ignition and then to flaming autoignition. As the sample thickness increases, the minimum heat flux, ignition temperature, and burning duration for flaming autoignition all increase, while the peak burning flux decreases, but they are insensitive to the sample diameter. During ignition and burning processes, the disc particle is deformed due to the interaction between chemical reactions and thermomechanical stresses, especially for smoldering. The characteristic thickness of the smoldering front on wood is also found to be 10–15 mm. This study sheds light on the size effect on the ignition of wood particles by wildfire radiation and helps understand the interaction between flaming and smoldering wildfires.
Keywords: Disc particles
Firebrands
Ignition limit
Minimum radiation
Smoldering fire
Publisher: Frontiers Research Foundation
Journal: Frontiers in mechanical engineering 
EISSN: 2297-3079
DOI: 10.3389/fmech.2021.686638
Rights: © 2021 Wang, Ding, Lin, Gong and Huang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (https://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
The following publication Wang S, Ding P, Lin S, Gong J and Huang X (2021) Smoldering and Flaming of Disc Wood Particles Under External Radiation: Autoignition and Size Effect. Front. Mech. Eng 7:686638 is available at https://doi.org/10.3389/fmech.2021.686638
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