Normal spectral emission from nonhomogeneous mixtures of CO sub 2 gas and Al sub 2 O sub 3 particulate

Journal Article · Fri Feb 01 00:00:00 EST 1991 · Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.2910522· OSTI ID:5643918

Walters, D V; Buckius, R O ^[1]

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1. Univ. of Illinois, IL (USA)

Measurements of spectral, normal intensity, accounting for nongray banded emission from CO{sub 2} gas and the influence of a highly scattering particulate, Al{sub 2}O{sub 3}, are presented. Detailed specifications of the temperatures, particle and gas properties, optical depths, and experimental uncertainties are given. The average temperatures are in the range 445 K to 600 K, pressures are approximately 1 atm. the layer depth is 0.5 cm, and particle optical depths are in the range 0 to 3. The intensity emitted from the medium is reported over a wavelength range of about 4.0 {mu}m to 4.7. Since the particle is virtually nonemitting, no continuum emission outside the 4.3 {mu}m CO{sub 2} band is detected. The effect of the particle is seen in the spectrally dependent and extinction coefficient dependent changes in the band structure when scattering is present. Modeling of the nonisothermal temperature distribution of the layer emerges as a critical factor in determining the magnitude of the emitted intensity. Uncertainty in the magnitude of the temperature accounts for most of the estimated uncertainty in the spectral intensity. A comparison of the experimental band intensities with values computed using a nonhomogeneous scattering model (which rigorously incorporates wide-band modeling) indicates excellent agreement for most runs.

• OSTI ID: 5643918
• Journal Information: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Vol. 113:1; ISSN 0022-1481
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
EMISSIVITY
CARBON DIOXIDE
HIGH TEMPERATURE
MATHEMATICAL MODELS
TEMPERATURE DISTRIBUTION
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SURFACE PROPERTIES
360104* - Metals & Alloys- Physical Properties
360603 - Materials- Properties