Opacities of carbon-air mixtures at temperatures from 3000–10,000°K

Main, Roger P.; Bauer, Ernest

doi:10.1016/0022-4073(66)90061-6

Cited by 10 publications

(2 citation statements)

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“…Since the 1950s, a significant number of works have been focussed toward calculating accurate and comprehensive radiative properties of heated air. These include works from Churchill et al [60][61][62] and Gilmore [63,64], where absorption and emission coefficients of the dominant air species (N, O, N 2 , O 2 , NO and their ions) were calculated for a large range of photon energies, temperatures and densities of the plasma assuming LTE, while air and soot (in the form of carbon species) mixtures have been considered by Main and Bauer [65]. These studies, along with several others [66,67], have also calculated Einstein emission coefficients, radiative lifetimes, etc of air diatomic molecules.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study of the radiative properties of NO—a first step toward a complete air opacity

Zammit¹,

Leiding²,

Colgan³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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In this paper we propose a methodology to calculate the radiative properties of the diatomic molecular constituents of air, and utilize the present approach to model the radiative properties of nitrogen monoxide, NO. We also investigate the important physics involved in calculating accurate radiative quantities for air, such as the Planck and Rosseland mean opacities, and emission and absorption coeﬃcients, as well as the couplings accounted for in rovibrational calculations. Complete active space self-consistent ﬁeld multi-reference conﬁguration interaction (CAS-MRCI) calculations were performed in order to model the NO X2Π, a4Π, b4Σ-, 12Σ+, 22Σ+, 32Σ+, G2Σ-, B′2∆, (C, B) 22Π, (H′, L) 32Π, and 12Φ adiabatic states, and calculate the respective molecular data. The γ X2Π -A2Σ+, ε X2Π - D2Σ+, β′ X2Π - B′2∆, “11,000 Å” A2Σ+ - D2Σ+, “infrared” X2Π - X2Π and X2Π-(C, B) 22Π (δ and β) band systems are investigated in monochromatic spectra calculations, as well as the Ogawa a4Π- b4Σ- band and several other band systems. Several conclusions are drawn, such as the importance of including the Ogawa band, which has not been included in previous air radiative models or comprehensive line-list calculations, as well as the importance of performing coupled rovibrational line-list calculations in order to accurately calculate the Rosseland means. We also found that the additional band systems modeled here contribute signiﬁcantly to the total Planck and Rosseland means.

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Section: Introductionmentioning

confidence: 99%

A comprehensive study of the radiative properties of NO—a first step toward a complete air opacity

Zammit¹,

Leiding²,

Colgan³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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“…These are the emissions produced due to the rapid acceleration or deceleration phase of the vehicle. Nowadays there exist many different commercially available techniques for PM and soot concentration emission measurement, based on gravimetric analyses [7], paper filter-type smoke meter [8], measurement of continuous opacity [9,10], differential mobility spectrometers [11][12][13], measurement of photoacoustic spectroscopy [14][15][16] and measurement of laser-induced incandescence (LII) [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Different Techniques for Measurement of Soot and Particulate Matter Emissions from Diesel Engine

Viskup¹

2020

Introduction to Diesel Emissions

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The research presented here is the comparison studies between different commercially available techniques for measurement of soot and particulate matter (PM) emissions from passenger car diesel engine. The compared devices are filter paper-type smoke meter, photoacoustic spectrometer, opacimeter, differential mobility spectrometer and laser-induced incandescence. The focus is to study static and dynamic transient exhaust emissions from the location position closer to the actual combustion event-downstream of the turbine, position characterised by the higher temperature and higher pressure of the emission gas-than the standard measurement position, in the tailpipe of the exhaust manifold. The main task is to compare an accuracy and sensitivity of individual devices at static and dynamic soot and PM emissions.

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Graphite sublimation temperatures, carbon arcs and crystallite erosion

Abrahamson

1974

Carbon

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Opacities of carbon-air mixtures at temperatures from 3000–10,000°K

Cited by 10 publications

References 50 publications

A comprehensive study of the radiative properties of NO—a first step toward a complete air opacity

A comprehensive study of the radiative properties of NO—a first step toward a complete air opacity

Comparison of Different Techniques for Measurement of Soot and Particulate Matter Emissions from Diesel Engine

Graphite sublimation temperatures, carbon arcs and crystallite erosion

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