Experimental observations on the steady-state burning rate of a vertically oriented PMMA slab

Pizzo, Yannick; Consalvi, Jean-Louis; Querre, P.; Coutin, M.; Audouin, L.; Porterie, B.; Torero, José L.

doi:10.1016/j.combustflame.2007.06.020

Cited by 59 publications

(22 citation statements)

References 22 publications

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“…The experimental apparatus consists of a vertical sample of clear PMMA 200 mm in height, 50 mm in width [6,14], and 1 mm in thickness. The tests were carried on the same type of PMMA with the same parameters such as the ignition temperature and density, which reduced the experimental error and flame fluctuation [15].…”

Section: Methodsmentioning

confidence: 99%

“…defined pyrolysis zone as a blackened underside. A new processing method, based on wavelet decomposition, was developed to detect the pyrolysis front location from the video recordings of bubbling surface by Pizzo and Consalvi et al [14,31]. Figure 5c shows the infrared images of samples using an infrared camera, which was set at the front of fuels.…”

Section: Pyrolysis Height and Burnout Lengthmentioning

confidence: 99%

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Experimental Studies on the Effects of Spacing on Upward Flame Spread over Thin PMMA

et al. 2016

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Experiments were carried out to study the effect of spacing between wall and thin fuels on upward flame spread. The front flame height, back flame height, pyrolysis height, burnout length, and pyrolysis spread rate were measured by video image analysis with spacings of 2 mm, 7 mm, 13 mm, 19 mm, and 25 mm. Experiments were performed on uniform PMMA (polymethyl-methacrylate) samples with 200 mm height, 50 mm width, and 1 mm thickness. The results are as follows: (1) As the spacing increased, the front flame height, back flame height, pyrolysis height, and burnout length showed the same trajectory, first increased and then decreased. The maximum trajectory was observed at a spacing of 6.5% of the wall height. (2) At an infinite length of PMMA, the pyrolysis zone and pyrolysis spread rate would reach an asymptotic steady state, and the pyrolysis and burnout spread rates will be asymptotically equal. (3) Of particular interest is the maximum mass-loss rate for a wall spacing/sample height ratio (0.065) due to enhanced the radiation fluxes. In this study, the effects of spacing between wall and fuels on upward flame spread was investigated for the first time using 1 mm thick PMMA sheets, including two-face burning case.

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Section: Methodsmentioning

confidence: 99%

Section: Pyrolysis Height and Burnout Lengthmentioning

confidence: 99%

Experimental Studies on the Effects of Spacing on Upward Flame Spread over Thin PMMA

et al. 2016

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“…Flame brightness grew considerably throughout the test, requiring repeated changes in the exposure level of the lens in order to observe the flame for the entire duration. In contrast to other work [31,32], a constant threshold was therefore not appropriate, and despite efforts to develop a method that subtracted background noise and adjust threshold levels with ambient brightness, it was not possible to compensate for background changes, such as soot deposition on the inert wall above the setup, throughout the test duration. Highlighting jumps in intensities between adjacent pixels, i.e.…”

Section: Quantitative Resultsmentioning

confidence: 87%

Warehouse commodity classification from fundamental principles. Part I: Commodity & burning rates

Gollner¹,

Overholt²,

Williams³

et al. 2011

Fire Safety Journal

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“…Unlike liquid fuels, for PMMA the local mass-burning rate can also be approximated a posteriori by measuring local surface regression over fixed intervals of time 2,11 . PMMA samples were burned under representative conditions for periods of time starting at 50 sec and increasing at 50 sec intervals followed by extinction of the sample.…”

Section: Representative Resultsmentioning

confidence: 99%

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

Singh

Gollner

2016

JoVE

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Modeling the realistic burning behavior of condensed-phase fuels has remained out of reach, in part because of an inability to resolve the complex interactions occurring at the interface between gas-phase flames and condensed-phase fuels. The current research provides a technique to explore the dynamic relationship between a combustible condensed fuel surface and gas-phase flames in laminar boundary layers. Experiments have previously been conducted in both forced and free convective environments over both solid and liquid fuels. A unique methodology, based on the Reynolds Analogy, was used to estimate local mass burning rates and flame heat fluxes for these laminar boundary layer diffusion flames utilizing local temperature gradients at the fuel surface. Local mass burning rates and convective and radiative heat feedback from the flames were measured in both the pyrolysis and plume regions by using temperature gradients mapped near the wall by a two-axis traverse system. These experiments are time-consuming and can be challenging to design as the condensed fuel surface burns steadily for only a limited period of time following ignition. The temperature profiles near the fuel surface need to be mapped during steady burning of a condensed fuel surface at a very high spatial resolution in order to capture reasonable estimates of local temperature gradients. Careful corrections for radiative heat losses from the thermocouples are also essential for accurate measurements. For these reasons, the whole experimental setup needs to be automated with a computer-controlled traverse mechanism, eliminating most errors due to positioning of a microthermocouple. An outline of steps to reproducibly capture near-wall temperature gradients and use them to assess local burning rates and heat fluxes is provided.

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Experimental observations on the steady-state burning rate of a vertically oriented PMMA slab

Cited by 59 publications

References 22 publications

Experimental Studies on the Effects of Spacing on Upward Flame Spread over Thin PMMA

Experimental Studies on the Effects of Spacing on Upward Flame Spread over Thin PMMA

Warehouse commodity classification from fundamental principles. Part I: Commodity & burning rates

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

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