Effect of nongray thermal radiation on laminar forced convection over a heated horizontal plate

Lord, H. A.; Arpacı, Vedat S.

doi:10.1016/0017-9310(70)90099-2

Cited by 17 publications

(5 citation statements)

References 10 publications

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“…Using.a modified Schmidt Method technique, Markstein [24], and Santo The theorectical part of this report extends the work of previous studies, which neglect radiation in combusting boundary layers [26][27][28][29][30][31][32]. Many authors [33][34][35][36][37][38][39] h~ve discussed the interaction of conveetion artd radiation in an inert boundary layer.…”

Section: Disclaimermentioning

confidence: 55%

Soot and radiation in combusting boundary layers

Beier¹

1981

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In most fires thermal radiation is the dominant mode of heat transfer. 'Carbon particles within the fire are responsible for most of this emitted radiation and hence warrant quantification. As a first step toward understanding thermal radiation in full scale fires, an experimental and theoretical study is presented for a laminar combusting boundary layer. Carbon particulate volume fraction profiles and approximate particle size distributions are experimentally determined in both free and forced flow for several hydrocarbon fuels and PMMA (polymethylmethacrylate), A multiwavelength ' laser transmission technique determines a most probable radius and a total particle concentration which are two unknown parameters in an assumed Gauss size distribution. A sooting region is observed on the fuel rich side of the main reaction zone. For the free flames in air, the liquid fuel soot volume fractions,

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Section: Disclaimermentioning

confidence: 55%

Soot and radiation in combusting boundary layers

Beier¹

1981

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“…As is well known, the primary effect of thermal radiation on high-temperature problems is on the heat flux. Studies by Arpaci and coworkers [58,59,61,62,[64][65][66], and Selamet and Arpaci [63,67] show the emission, absorption, and scattering (hotness, optical thickness, and refractive) effects on this flux. However, there is no experimental literature on pool fires separating these effects.…”

Section: Appendix: Radiation Effectmentioning

confidence: 91%

Buoyancy-driven turbulent diffusion flames

Arpacı

Selamet

1991

Combustion and Flame

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“…(1) for exp[-(3dpBR)'~X]--" 1 may be found in Cess [6], and those leading to expressions similar to Eq. (2), but with neglected scattering, may be found in Arpaci [7] and Arpaci and Larsen [8] (see also Lord and Arpaci [9], Arpaci [10], Arpaci and G6ziim [11], Arpaci and Bayazito~,lu [12], Phillips and Arpaci [13], and Arpaci et al [14]). On the wall, the foregoing radiation fluxes reduce to…”

Section: Radiative Heat Fluxmentioning

confidence: 99%

Radiation-affected laminar flame quenching

Arpacı

Tabaczynski

1984

Combustion and Flame

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Under the influence of radiation, the increase in Peclet number characterizing the flame quench distance A, p.cpSu Tb ° adiabatic flame enthalpy flow Pe-hTb°/A conduction and the decrease in flame temperature are shown in terms of an original radiation number T/T(I-6./2)Bb 0 total radiation I + 3~'2(2/¢.-1)/(1-o~) adiabatic flame ethalphy flow where p is the density, cp the specific heat at constant pressure, Su the laminar flame speed, Tb the flame temperature, subscript u the unburned gas and superscript 0 the adiabatic gas,), the thermal conductivity, 7/= (rp/rR)"2 the weighted nongrayness, rp and rR being the Planck mean and the Rosseland mean of the absorption coefficient, ¢. the wall emissitivity, r= rMI the optical thickness, XM = (rpxR)~/2 being the mean absorption coefficient and I a characteric length (related to geometry or quench distance), o~ the albedo of single scattering, and Bb ° the adiabatic flame Boltzmann number. 4Eb ° emission Bb0=-p,cpS. °T b° adiabatic flame enthaipy flow where Eb is the blackbody emissive power. It is qualitatively shown that the contribution of radiation to the heat transfer and the laminar flame quenching in small diesel engines can be as much as 35%. I. INTRODUCTION A recent study by Arpaci and Tabaczynski [1], hereafter called P1, introduces a radiative heat flux which includes the emission, absorption,

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Effect of nongray thermal radiation on laminar forced convection over a heated horizontal plate

Cited by 17 publications

References 10 publications

Soot and radiation in combusting boundary layers

Soot and radiation in combusting boundary layers

Buoyancy-driven turbulent diffusion flames

Radiation-affected laminar flame quenching

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