Soot and radiation in combusting boundary layers

Beier, Richard A.

doi:10.2172/5507527

Cited by 6 publications

(12 citation statements)

References 31 publications

(55 reference statements)

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“…Table 2 gives the enthalpy and species fields in any system to which the fast kinetics Shvab-Zeldovich assumptions (69) apply. Extentions exist to include radiation (70,71) and multiple flame sheets (71,72). These results also supply the far field for applying activation-energy asymptotics (69) to incorporate finite rate kinetics in diffusion flame analyses.…”

Section: Flows Within Compartments and 3 Flows Atmentioning

confidence: 99%

Fire Physics - Promises, Problems, And Progress

Pagni¹

1989

Fire Safety Science - Proceedings of the 2nd International Symp

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Section: Flows Within Compartments and 3 Flows Atmentioning

confidence: 99%

Fire Physics - Promises, Problems, And Progress

Pagni¹

1989

Fire Safety Science - Proceedings of the 2nd International Symp

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“…As a first approximation , the temperature dependence of the volumetric heat generation rate is not included in the present analysis. The reference values for the volumetric heat generation rate have been taken from various sources (De Ris, 1979;Modak, 1976;Markstein, 1979;Beier et al, 1984). It should be noted that the present analysis is applicable to wall fire configurations as well as pool fires.…”

Section: Mathematical Model and Assumptionsmentioning

confidence: 99%

“…Flame properties of several liquid fuels are summarized in Table II. The volumetric heat release rate is calculated based on experimental data by Beier et al (1984), using the relation Ln. is taken as a mean value, and 6.H denotes the heat of combustion.…”

Section: K(dandtn)mentioning

confidence: 99%

Flame Wall-Quenching by Radiation and Conduction in Combustion of Condensed Fuels

Lee

Tien

1985

Combustion Science and Technology

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The effect of thermal radiation and conduction on the cold-wall flame-quenching distance in the combustion of condensed fuels is studied by use of a simple physical model under steady-state, no-flow conditions. The singular perturbation technique is employed for the flame layer analysis, and the quenching layer is assumed to be optically thin. The quenching distance is obtained as a function of various therrnophysical and radiative parameters such as the conduction-radiation ratio, optical thickness and heat generation intensity by chemical reactions. A new dimensionless group, the modified Damkohler number, which characterizes the relative strength of heat generation to radiation transport, emerges from the analysis. Also, the present analysis suggests a potential experimental scheme for measuring the extinction temperature in the specified combustion configurations.

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“…2 are a small portion of the available data (27,28). At each point, a size distribution in the form of Eq.…”

Section: Introductionmentioning

confidence: 99%

Soot generation within radiating diffusion flames

Pagni

Okoh

1985

Symposium (International) on Combustion

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C 7 H 16 and (C S H 8 0 2 )n] in free, radiating, boundary layer, diffusion flames are represented analytically. Approximate particle concentrations and size distributions, determined with previously reported optical techniques, are used. These sizes, r -30 nm, indicate the particles are in the free molecular flow regime, Kn -10, so that the thermal boundary layer thickness around the particle approaches zero and the particle temperature is locked to the local gas temperature. Based on this coupling and the experimental -soot fv -1 ppm, the optically thin approximation is valid for incorporating soot radiation in the gas boundary layer equations. The pertinent fields, i.e. tpmperature, velocity and species, are reported. Thermophoretic forces are included in particle trajectory calculations. The local soot mass flow rates within the boundary layer are derived and net soot mass generation rates are obtained for these well characterized laminar flames. An Arrenhius expression appears to suffice to describe the temperature dependence of the soot growth rate over a 400 0 K temperature range, 19S0 < T < 23S0K. Toluene has Ea = 108 kcal/mole while all the other fuels examined have Ea = 86 kcal/mole, very close to H3C -C6HS and C-C bond energies, respectively. Consistent with the goal of fire radiation prediction, calculated temperatures and velocities were used to obtain these empirical energies. Temperature and velocity measurements are in progress. Future work will include mixed flow boundary layer systems where control over the free stream oxygen mass fraction in a combustion tunnel configuration provides greater flame stability and a wider temperature range.

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Soot and radiation in combusting boundary layers

Cited by 6 publications

References 31 publications

Fire Physics - Promises, Problems, And Progress

Fire Physics - Promises, Problems, And Progress

Flame Wall-Quenching by Radiation and Conduction in Combustion of Condensed Fuels

Soot generation within radiating diffusion flames

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