Direct measurement of heat of gasification for polymethylmethacrylate

Jackson, Jerimiah M

doi:10.6028/nist.ir.88-3809

Cited by 3 publications

(1 citation statement)

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“…The solution is obtained by solving Eqns (14) or (1 3) with the boundary conditions of Eqn (16a) and the first of Eqn (16b). The second relationship of Eqn (16b) is needed in the assumed temperature profile for the integral solution: (17) T= Ay2 + B y + C Using the above conditions we obtain for A, B and C:…”

Section: Gasification Periodmentioning

confidence: 99%

An approximate integral model for the burning rate of a thermoplastic‐like material

Quintiere

Iqbal

1994

Fire and Materials

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An approximate integral model is formulated and solved to describe the pyrolysis or burning rate of a thermoplasticlike material A constant temperature gasification process is assumed to occur at the solid-atmosphere interface. The preheating ignition problem is also solved by a matching integral method. The ignition problem leads to a solution involving a non-linear algebraic equation, but the gasification problem yields an exact solution provided the convective heat transfer coefficient is unaffected by the fuel mass loss or blowing effect. The results are compared to numerical solutions in the literature and show good agreement. Comparisons with experimental data for PMMA are limited.

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Section: Gasification Periodmentioning

confidence: 99%

An approximate integral model for the burning rate of a thermoplastic‐like material

Quintiere

Iqbal

1994

Fire and Materials

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Measurement of Flame Heat Flux Using the Cone Calorimeter

Ibrahimli¹,

DiDomizio

Lakhani³

et al. 2023

Obtaining Data for Fire Growth Models

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The study described in this paper explored methods for measuring heat flux from a flame to a specimen surface using the cone calorimeter. Knowledge of flame heat flux in cone calorimeter measurements of heat release and mass loss rates used as input for fire modeling is needed to make accurate predictions of burning rates in actual fires. Methanol and black poly(methyl methacrylate) (PMMA) samples were subjected to five levels of external irradiance in the cone calorimeter. Two methods were used for estimating flame heat flux to the fuel surface. First, simultaneous measurements of mass burning and heat release rate were obtained and values of effective heats of gasification and combustion, as well as fractions of heat release rate corresponding to heat feedback (heat feedback fraction) and heat flux from the flame to the fuel surface, were derived. Fractions of 0.076 and 0.065 and flame heat fluxes between 16.6 and 17.5 kW/m2 and between 3.5 and 18.2 kW/m2 were calculated for methanol and PMMA, respectively. Second, flame heat flux and corresponding heat feedback fractions were estimated by measuring the total heat flux to the fuel surface with a water-cooled heat flux gauge in the sample holder. Measured flame heat flux and derived heat feedback fraction decreased with increasing external irradiance for both fuels, possibly due to attenuation of thermal radiation by unburned fuel vapor above the heat flux gauge. Additional study of this phenomenon is needed. Because of uncertainties associated with flame heat flux values determined via measurement of total heat flux to the sample surface, the first approach is currently recommended for quantification of flame heat flux to condensed-phase fuels using the cone calorimeter. More work is needed to extend and validate the approach for condensed-phase fuels that produce soot-laden flames and do not burn at a steady rate.

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A semi-quantitative model for the burning rate of solid materials

Quintiere¹

1992

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An analytical model was developed to describe the processes involved in the burning and extinction of solid materials. Included are flame heat transfer, charring, transient conduction, and water application. The model qualitatively describes the burning rate of both charring and thermoplasticlike solids. It illustrates how the steady-state heat of gasification can be derived from peak burning rate test data taken as a function of irradiance. Experimental data are shown to support this derivation. The model, in conjunction with a critical flame temperature, is used to describe suppression and extinction by water.

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Direct measurement of heat of gasification for polymethylmethacrylate

Cited by 3 publications

References 0 publications

An approximate integral model for the burning rate of a thermoplastic‐like material

An approximate integral model for the burning rate of a thermoplastic‐like material

Measurement of Flame Heat Flux Using the Cone Calorimeter

A semi-quantitative model for the burning rate of solid materials

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