Experimental and numerical study of the effect of sample orientation on the pyrolysis and ignition of wood slabs exposed to radiation

Yang, Lizhong; Wang, Yafei; Zhou, Xiaodong; Dai, Jing; Deng, Zhihua

doi:10.1177/0734904111429272

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…Babrauskas 1 concluded that ignition times for the vertical orientation are longer than for the upward orientation. Similar results were also reported by Shields et al 2 However, an opposite result was obtained by Yang et al 3 He used the parallel silicon–carbide rods as radiation source, but found ignition times for vertical orientation are somewhat shorter. Shields et al 2 reported that the ignition times for the downward orientation are about three times longer than those for upward orientation by using the ISO 5657 apparatus.…”

Section: Introductionsupporting

confidence: 84%

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Effects of sample orientation on pyrolysis and piloted ignition of wood

Chen

Zhou

et al. 2014

Journal of Fire Sciences

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In this work, the pyrolysis and piloted ignition behavior of thermally thick paulownia wood brick for different orientations has been experimentally investigated, by using the conical heater. Three typical orientations were adopted, that is, upward, downward, and vertical cases with the incident heat flux ranging from 12 to 39 kW/m 2 . A numerical approach was used to test the effect of heat convection and radiation blockage on pyrolysis. The ignition time was observed to be strongly dependent on orientation. In detail, the shortest ignition time turns to be for downward orientation, but longest ignition time for vertical orientation. Total mass loss at ignition is weakly dependent on orientation. Meanwhile, critical mass flux increases with external heat flux rising and varies somewhat with orientation.

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Section: Introductionsupporting

confidence: 84%

“…Besides, the radiation blockage for the upward case is noticed to be greater than the vertical case. 3 This is because of the fact that for the vertical case, the pyrolysis gas flow upward along the surface, leading to smaller radiation attenuation than the upward case.…”

Section: Surface Temperaturementioning

confidence: 99%

Effects of sample orientation on pyrolysis and piloted ignition of wood

Chen

Zhou

et al. 2014

Journal of Fire Sciences

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“…Babrauskas [ 11 ], Shields [ 4 ] and Tsai [ 12 ] found the ignition time ratio of vertical and horizontal is 1.2/1.4. However, with the different location of pilot, Yang et al [ 13 ] found ignition times of wood for vertical orientation are shorter than horizontal, which is different from the result of Babrauskas and Shields. Tsai [ 12 ] conducted experimental work on the orientation effect to study the thermal processes in solid prior to ignition, while the pyrolysis process was ignored.…”

Section: Introductionmentioning

confidence: 94%

Experimental and Numerical Study on Effect of Sample Orientation on Auto-Ignition and Piloted Ignition of Poly(methyl methacrylate)

et al. 2015

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In this work, the effect of seven different sample orientations from 0° to 90° on pilot and non-pilot ignition of PMMA (poly(methyl methacrylate)) exposed to radiation has been studied with experimental and numerical methods. Some new and significant conclusions are drawn from the study, including a U-shape curve of ignition time and critical mass flux as sample angle increases for pilot ignition conditions. However, in auto-ignition, the ignition time and critical mass flux increases with sample angle α. Furthermore, a computational fluid dynamic model have been built based on the Fire Dynamics Simulator (FDS6) code to investigate the mechanisms controlling the dependence on sample orientation of the ignition of PMMA under external radiant heating. The results of theoretical analysis and modeling results indicate the decrease of total incident heat flux at sample surface plays the dominant role during the ignition processes of auto-ignition, but the volatiles gas flow has greater influence for piloted ignition conditions.

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“…This was attributed to the differences in radiation attenuation in horizontal and vertical sample orientations owing to the difference in the structure of the pyrolysis gas plume and the fact that radiation absorption by pyrolysis gas was significantly different in the two configurations. Yang et al [120] reported that for horizontal samples, absorption of radiation by pyrolysis gas is stronger, and hence the net incident heat flux into the sample surface is less than for vertical samples. Thus, in the presence of a piloted ignition source, the ignition times of horizontal samples are slightly longer than the ones of vertical samples, despite the same distance between the sample and the radiant heater.…”

Section: Geometry / Configurationmentioning

confidence: 99%

Ignitibility of structural wood products exposed to embers during wildland fires :

Nazaré¹,

Leventon²,

Davis³

2021

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Ignitability of structural components due to ember accumulation is a common cause of structural fires in wildland urban interface (WUI) communities. To fire harden structures in WUI communities, it is important to quantitatively predict the ember ignitability of wooden substrates. To commence this effort, past studies have been compiled and analyzed to identify knowledge gaps. Key topics including ignition of structures in WUI fires, measurement of thermal response of solid wood products used in residential structures, controlling mechanisms in ignition and sustained smoldering of wood, measurement of ember properties, real-scale and bench-scale experiments on assessing ember ignitability of structural components, and surrogate ignition sources for assessing smoldering propensity of the wooden substrate have been reviewed. Existing test methods have also been reviewed in the light of common exposures seen WUI environment.

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Experimental and numerical study of the effect of sample orientation on the pyrolysis and ignition of wood slabs exposed to radiation

Cited by 11 publications

References 17 publications

Effects of sample orientation on pyrolysis and piloted ignition of wood

Effects of sample orientation on pyrolysis and piloted ignition of wood

Experimental and Numerical Study on Effect of Sample Orientation on Auto-Ignition and Piloted Ignition of Poly(methyl methacrylate)

Ignitibility of structural wood products exposed to embers during wildland fires :

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