The Mass Burning Rate and Mass Transfer Number of Selected Polymers, Wood, and Organic Liquids

Petrella, R. V.

doi:10.1080/03602557908067676

Cited by 17 publications

(5 citation statements)

References 7 publications

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“…The occurrence of self-extinction of timber has been reported by several researchers in the past, mainly as an event observed in studies focused in understanding the different phenomena related to the burning of timber [5][6][7]. Nevertheless, the growing need to design fire-safe timber structures has increased interest in this phenomenon.…”

Section: Self-extinction Of Timbermentioning

confidence: 98%

Flame extinction and burning behaviour of timber under varied oxygen concentrations

Cuevas

Torero

Maluk

2021

Fire Safety Journal

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Self-extinction plays a key role in enabling the safe use of timber structures in mid-and high-rise construction, where structural integrity during and after a fire is key. To date, the influence that oxygen concentration may have in the conditions that lead to self-extinction has not been studied in depth. Also, the thermal conditions of timber after self-extinction has occurred have also not been carefully studied. During fires, oxygen concentrations will defer from those during ambient conditions. Within this study, the testing conditions were carefully controlled to investigate the circumstances before and after the occurrence of self-extinction; considering a range of heat exposures and oxygen concentrations in the air surrounding the test sample. A statistically sound number of repeat tests was done to estimate the occurrence of self-extinction. For samples tested in air containing 21% oxygen, self-extinction always occurs for an incident heat flux of 30 kW/m 2 but never occurs for 40 kW/m 2 ; with the critical mass loss rate that leads to self-extinction being 3.65±0.4 g/m 2 s. The study concluded that lower oxygen concentrations result in an increase of the critical mass loss rate leading to self-extinction and an increase of the minimum incident heat flux leading self-extinction.

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Section: Self-extinction Of Timbermentioning

confidence: 98%

Flame extinction and burning behaviour of timber under varied oxygen concentrations

Cuevas

Torero

Maluk

2021

Fire Safety Journal

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“…Like the ignition process, the burning of solid fuels by flaming combustion has been the subject of increasingly detailed analyses and numerical simulation modeling efforts over the years (Kansa, Perlee, and Chaiken 1977;Lee 1978;Petrella 1980;Holve and Kanury 1982;Phillips and Becker 1982;Wichman and Atreya 1987). But the fundamentals of the process can be captured roughly by a simple heat balance.…”

Section: Burning Ratementioning

confidence: 99%

Modeling Ignition and Burning Rate of Large Woody Natural Fuels

Albini¹,

Reinhardt²

1995

Int. J. Wildland Fire

129

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As part of the development of a model for predicting fuel loading reductions by and intensity histories of fires burning in large woody natural fuels, it was necessary to develop separate models for the processes of ignition and rate of burning of individual fuel elements. This paper describes the derivation of predictive equations for ignition delay time and burning rate (from diameter reduction rate) of large woody natural fuels in a fire environment. The method consists of deriving approximate functional forms using fuel component properties and a measurable ''fire environment temperature'' and then fitting these forms to data taken in laboratory fires using a large propane burner. The equations describe the calibration data with precision adequate for the purpose for which they were designed.

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“…The slope of the straight line must be equal , according to the Tewarson's relationship, to the inverse of the heat of gasification of the material. From the straight line plotted in Figure 5, a value equal to 1700 Jig is obtained, very close to the values measured for commercial PMMA (Tewarson, 1976;Petrella, 1980). The variation with time of the surface temperature is compared to the evolution of the mass rate in Figure 11 for the 3.…”

Section: Resultsmentioning

confidence: 73%

Experimental and Numerical Study of the Thermal Degradation of PMMA

Vovelle

Delfau

Reuillon

et al. 1987

Combustion Science and Technology

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Thermal degradation of PMMA subjected to a radiant heat flux was studied both experimentally and numerically . Very accurate measurements of mass loss rate and temperature profiles were performed for three constant heat fluxes: 1.5,2.3 and 3.0 W·cm-'. The results show that the mass loss rate cannot be directly related to the surface temperature and a. contribution of the sub-surface region of the sample to the rate of gasification must be taken into account in a thermal degradation model. A heat source term was introduced in the conduction equation and a kinetic equation was used to locally calculate the mass loss rate in each slab of the solid. The density and the thermal conductivity of the material were assumed temperature independent while for the specific heat the values measured by differential scanning calorimetry in the range 20-400·C were retained. The predictions of the model are in very close agreement with the experimental results for the evolution with time of both the temperature profile in the solid and the mass loss rate.

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The Mass Burning Rate and Mass Transfer Number of Selected Polymers, Wood, and Organic Liquids

Cited by 17 publications

References 7 publications

Flame extinction and burning behaviour of timber under varied oxygen concentrations

Flame extinction and burning behaviour of timber under varied oxygen concentrations

Modeling Ignition and Burning Rate of Large Woody Natural Fuels

Experimental and Numerical Study of the Thermal Degradation of PMMA

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