On the importance and modeling of in-depth spectral radiation absorption in the pyrolysis of black PMMA

Alinejad, Farid; Bordbar, Hadi; Hostikka, Simo

doi:10.1016/j.firesaf.2022.103706

Cited by 8 publications

(2 citation statements)

References 44 publications

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“…Fire 2024, 7, 117 2 of 20 the sample temperature using Laplace transforms [2]. More recently, very similar models were used by Gong et al [8][9][10], Zhai et al [11], Lai et al [12] or Alinejad et al [13] to study PMMA ignition. In all cases, the absorption coefficient κ is the key parameter monitoring in-depth absorption.…”

Section: Al Proposed An Analytical Solution Formentioning

confidence: 99%

Effect of Bubbling on Ignition of PMMA Slab: Change in Thermo-Physical and Thermo-Radiative Properties

Vincent,

Longuet,

Aprin

et al. 2024

Fire

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In semi-transparent polymers, ignition is not only dependent on conductive thermal transfer into the material but also on in-depth absorption of the radiation. The aim of this work was to investigate the influence of bubbling on the thermo-physical and thermo-radiative properties of PMMA and how it may affect its ignition. PMMA plates of varying thickness were exposed to the heat flux of two radiative sources with different emission spectra. Exposure was stopped after different periods of time to study bubbling kinetics and bubble size distribution by optical microscopy. Front and back surface temperatures of samples were recorded during heat exposure. The results indicate that the bubble size distribution is closely related to the temperature gradient within the sample. Steep thermal gradients lead to small-sized bubbles underneath the exposed surface, while weak thermal gradients generate a wider size distribution with in-depth bubbling. All thermo-physical quantities k, ρ and Cp were shown to decrease with increasing bubbling degree. Likewise, it was highlighted that bubbling modifies the thermo-radiative properties of PMMA, especially in the near-infrared range. Transmittance decreases while absorbance increases with a bubbling degree. The increase in the absorption coefficient was attributed to multiple scattering by bubbles that expand the pathway of radiation into the materials. It was concluded that changes in both the thermo-physical and thermo-radiative properties with bubbling were likely to account for the delay in ignition observed when using the near-infrared heating source.

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Section: Al Proposed An Analytical Solution Formentioning

confidence: 99%

Effect of Bubbling on Ignition of PMMA Slab: Change in Thermo-Physical and Thermo-Radiative Properties

Vincent,

Longuet,

Aprin

et al. 2024

Fire

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show abstract

“…The team conducted extensive experiments to analyze the performance of the photovoltaic system when integrated with Al 2 O 3 -nanofluid at different flow rates. Xianqin and colleagues [ 38 ] conducted a study to investigate the thermal performance of iron oxide (Fe 3 O 4 ) and copper (Cu) nanoparticles in a hybrid nanofluid flow. The experiment involved using a Casson material with Hall current in a complex wavy channel.…”

Section: Introductionmentioning

confidence: 99%

Numerical examination of expanding the effectiveness of thermal photovoltaic framework by changing the level of heat transfer conveyance

Gavahi,

Karimzadeh,

Shahabi Takami

et al. 2024

Heliyon

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Waste heat recovery, efficient lighting, and proper insulation: a comprehensive study of energy consumption and savings in the residential sector

Momeni,

Kooban,

Alipouri Niaz

et al. 2023

Asian J Civ Eng

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On the importance and modeling of in-depth spectral radiation absorption in the pyrolysis of black PMMA

Cited by 8 publications

References 44 publications

Effect of Bubbling on Ignition of PMMA Slab: Change in Thermo-Physical and Thermo-Radiative Properties

Effect of Bubbling on Ignition of PMMA Slab: Change in Thermo-Physical and Thermo-Radiative Properties

Numerical examination of expanding the effectiveness of thermal photovoltaic framework by changing the level of heat transfer conveyance

Waste heat recovery, efficient lighting, and proper insulation: a comprehensive study of energy consumption and savings in the residential sector

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