NON LUMINOUS GAS RADIATION: APPROXIMATE EMISSIVITY MODELS

1982 ◽  
Author(s):  
Ihab H. Farag
Keyword(s):  
Gas Radiation

Combined gas radiation and laminar mixed convection in vertical concentric annuli

2002 ◽  
Author(s):  
Ezeddine Sediki ◽  
Anouar Soufiani ◽  
Mohamed Salah Sifaoui
Keyword(s):  
Mixed Convection ◽  
Gas Radiation ◽  
Laminar Mixed Convection

Calculation of Radiation Signal of Rocket Plume after Atmospheric Attenuation Using Wide Band K-Distribution Model

2013 ◽  
Vol 295-298 ◽  
pp. 2437-2441
Author(s):  
Xue Mei Yin ◽  
Qiu Yang Ma ◽  
Xue Hong Wu ◽  
Yi Gong ◽  
Yan Li Lu
Keyword(s):  
Remote Sensing ◽  
Rocket Engine ◽  
Wide Band ◽  
Distribution Model ◽  
Climatic Effects ◽  
Radiation Process ◽  
Gas Radiation ◽  
Atmospheric Remote Sensing ◽  
Rocket Plume ◽  
Liquid Rocket

The calculation of the gas radiation process plays an important role in the study of atmospheric remote sensing and climatic effects of greenhouse gas. The remote sensing of rocket plume has important significance for early warning, interception, detection, identification and tracking of flight vehicle. A model was established to calculate the remote sensing signal of rocket plume by wide band k-distribution, the liquid rocket plume remote sensing signals in atmospheric window region and the detectors’ working spectrum are calculated, and the results were compared with the results calculated by line-by-line approach. The results showed that in some of the detectors’ working spectral regions, the wide band k-distribution model can be used for the calculation of the remote sensing of liquid rocket engine exhaust plume.

The Influence of Real Gas Radiation On the Stability and Development of Benard Convection in a Two-Dimensional Layer

2021 ◽  
Author(s):  
Brent W. Webb ◽  
Vladimir Solovjov
Keyword(s):  
Rayleigh Number ◽  
Critical Rayleigh Number ◽  
Radiative Heating ◽  
Two Dimensional ◽  
Gas Temperature ◽  
Layer Depth ◽  
Real Gas ◽  
Gas Radiation ◽  
Induced Flow ◽  
Buoyancy Induced Flow

Abstract The influence of real gas radiation on the thermal and hydrodynamic stability is investigated in a two-dimensional layer of radiatively participating H2O and/or CO2 heated from below. The non-gray radiation effects of the two species are treated rigorously using a global spectral approach, the Spectral Line Weighted-sum-of-gray-gases model. The phenomena are explored by solving the full coupled laminar equations of motion, energy, and radiative transfer from the low-Rayleigh number, pure conduction-radiation regime through the onset of buoyancy-induced flow to the developed Bénard convection regime. The evolution of the thermal, velocity, and radiative heating fields is studied, and the critical Rayleigh number is characterized as a function of species mole fraction, average layer gas temperature, layer depth, wall emissivity, and the total gas pressure. It is found that participating radiation in the medium has the effect of stabilizing the layer, delaying transition to buoyancy-induced flow. The development of buoyancy-induced flow and temperature, along with the radiative heating are presented. It is found that the critical Rayleigh number in the radiatively participating gas layer can be more than an order of magnitude higher than the classical convection-only scenario. The onset of instability is found to depend on the species mole fractions, average gas temperature in the layer, wall emissivity, layer depth, and total pressure. Generally, all other variables being the same, H2O has a greater stabilizing influence on the layer than CO2.

Evaluation Of The Correlated-K And Other Gas Radiation Models For Combustion Applications

2003 ◽  
Vol 7 ◽  
pp. 927-938 ◽  
Author(s):  
S. Dembele ◽  
J. Zhang ◽  
J. Wen
Keyword(s):  
Gas Radiation
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