Wide Band Correlated-k Approach to Thermal Radiative Transport in Nonhomogeneous Media

The correlated-k approach is compared with the exact line-by-line calculations for thermal radiative transport in highly nonhomogeneous media containing water vapor and carbon dioxide. It is shown that the magnitude of the spectral interval over which k-distribution functions are generated can be increased up to approximately 1000 cm−1 for water vapor and 500 cm−1 for carbon dioxide, with only a slight loss of accuracy. Different solution techniques of the radiative transfer equation in nonhomogeneous media are used and compared. The wide band correlated-k method and a simplified approach to the exponential wide band correlated-k method are shown to provide very good results for the cases considered. The calculations include the entire infrared spectrum of water vapor and carbon dioxide for temperatures up to 2500 K.

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Narrow Band k-Distribution Model for Radiative Calculations of Non-Gray Gas

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1008-1009.846 ◽

2014 ◽

Vol 1008-1009 ◽

pp. 846-849

Author(s):

Yue Zhou ◽

Qiang Wang ◽

Hai Yang Hu

Keyword(s):

Carbon Dioxide ◽

Water Vapor ◽

Radiative Transfer Equation ◽

Narrow Band ◽

Radiative Properties ◽

Distribution Model ◽

Parallel Plates ◽

Radiative Intensity ◽

Final Integration ◽

Spectroscopic Database

Based on precise mathematical principles, a narrow band k-distribution (NBK) model is developed to calculate the radiative properties of water vapor and carbon dioxide. In this model, the integral variable of radiative transfer equation (RTE) is transformed from wavenumber to non-dimensional cumulative k-distribution function, leading to a final integration with very few quadrature points. Accuracy of the model is examined by calculating radiation in gases between two cold and black parallel plates. All the parameters calculated through NBK model, including radiative flux, transmissivity as well as radiative intensity, are compared with that of line-by-line calculations, which proves the NBK model can provide exact results with great computational savings. In this paper, absorption coefficients of water vapor and carbon dioxide are obtained from the line parameters in high-resolution spectroscopic database HITEMP 2010.

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TOTAL EMISSIVITY AND ABSORPTIVITY MODELS FOR CARBON DIOXIDE, WATER VAPOR AND THEIR MIXTURES

Proceeding of International Heat Transfer Conference 8 ◽

10.1615/ihtc8.4140 ◽

1986 ◽

Cited By ~ 2

Author(s):

F. R. Steward ◽

Yasar S. Kocaefe

Keyword(s):

Carbon Dioxide ◽

Water Vapor ◽

Total Emissivity

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A wide-band formulation based on the gray gas model applied to non-isothermal and homogeneous water vapor media

10.26678/abcm.encit2020.cit20-0269 ◽

2020 ◽

Author(s):

Roberta Juliana Collet da Fonseca ◽

Guilherme Fraga ◽

Francis França

Keyword(s):

Water Vapor ◽

Wide Band

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Faculty Opinions recommendation of Partitioning evapotranspiration using long-term carbon dioxide and water vapor fluxes.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.727830085.793534790 ◽

2017 ◽

Author(s):

Dennis Baldocchi

Keyword(s):

Carbon Dioxide ◽

Water Vapor

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Local structure and distortions of mixed methane-carbon dioxide hydrates

Communications Chemistry ◽

10.1038/s42004-020-00441-7 ◽

2021 ◽

Vol 4 (1) ◽

Author(s):

Bernadette R. Cladek ◽

S. Michelle Everett ◽

Marshall T. McDonnell ◽

Matthew G. Tucker ◽

David J. Keffer ◽

...

Keyword(s):

Carbon Dioxide ◽

Exchange Process ◽

Carbon Dioxide Sequestration ◽

Distribution Functions ◽

Atomic Scale ◽

Mixed Gas ◽

Pure Compounds ◽

Dynamics Simulations ◽

Pair Distribution Functions ◽

Methane Carbon

AbstractA vast source of methane is found in gas hydrate deposits, which form naturally dispersed throughout ocean sediments and arctic permafrost. Methane may be obtained from hydrates by exchange with hydrocarbon byproduct carbon dioxide. It is imperative for the development of safe methane extraction and carbon dioxide sequestration to understand how methane and carbon dioxide co-occupy the same hydrate structure. Pair distribution functions (PDFs) provide atomic-scale structural insight into intermolecular interactions in methane and carbon dioxide hydrates. We present experimental neutron PDFs of methane, carbon dioxide and mixed methane-carbon dioxide hydrates at 10 K analyzed with complementing classical molecular dynamics simulations and Reverse Monte Carlo fitting. Mixed hydrate, which forms during the exchange process, is more locally disordered than methane or carbon dioxide hydrates. The behavior of mixed gas species cannot be interpolated from properties of pure compounds, and PDF measurements provide important understanding of how the guest composition impacts overall order in the hydrate structure.

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