Numerical solution of the spectral radiation-gasdynamic problem of radiative cooling of a spherical plasma volume taking into account nonstationary radiation transfer

1981 ◽  
Vol 41 (2) ◽  
pp. 906-913 ◽  
Author(s):  
B. N. Bazylev ◽  
G. S. Romanov
Keyword(s):  
Numerical Solution ◽  
Plasma Volume ◽  
Radiation Transfer ◽  
Radiative Cooling ◽  
Spectral Radiation ◽  
Nonstationary Radiation ◽  
Spherical Plasma

Nonstationary radiation transfer in scattering media

Astrophysics ◽  
1976 ◽  
Vol 11 (3) ◽  
pp. 293-302 ◽  
Author(s):  
N. N. Rogovtsov ◽  
A. M. Samson
Keyword(s):  
Radiation Transfer ◽  
Scattering Media ◽  
Nonstationary Radiation

scholarly journals Second Law Analysis of Spectral Radiative Transfer and Calculation in One-Dimensional Furnace Cases

Entropy ◽  
2019 ◽  
Vol 21 (5) ◽  
pp. 461 ◽  
Author(s):  
Shiquan Shan ◽  
Zhijun Zhou
Keyword(s):  
Transfer Process ◽  
Radiation Transfer ◽  
Second Law Of Thermodynamics ◽  
Second Law ◽  
Spectral Radiation ◽  
One Dimensional ◽  
Spectrum Splitting ◽  
Transfer Equations ◽  
Second Law Analysis ◽  
Exergy Transfer

This study combines the radiation transfer process with the thermodynamic second law to achieve more accurate results for the energy quality and its variability in the spectral radiation transfer process. First, the core ideas of the monochromatic photon exergy theory based on the equivalent temperature and the infinite-staged Carnot model are reviewed and discussed. Next, this theory is combined with the radiation transfer equation and thus the spectral radiative entropy and the radiative exergy transfer equations are established and verified based on the second law of thermodynamics. Finally, one-dimensional furnace case calculations are performed to determine the applicability to engineering applications. It is found that the distribution and variability of the spectral radiative exergy flux in the radiation transfer process can be obtained using numerical calculations and the scatter media could slightly improve the proportion of short-wavelength radiative exergy during the radiation transfer process. This has application value for research on flame energy spectrum-splitting conversion systems.

scholarly journals Cirrus clouds triggered by radiation, a multiscale phenomenon

2010 ◽  
Vol 10 (1) ◽  
pp. 1135-1166 ◽  
Author(s):  
F. Fusina ◽  
P. Spichtinger
Keyword(s):  
Large Scale ◽  
Radiation Transfer ◽  
Ice Nucleation ◽  
Cirrus Clouds ◽  
Small Scale ◽  
Radiative Cooling ◽  
Cirrus Cloud ◽  
Microphysics Scheme ◽  
The Stability ◽  
Convective Cells

Abstract. In this study, the influence of radiative cooling and small eddies on cirrus formation is investigated. For this purpose the non-hydrostatic, anelastic model EULAG is used with a recently developed and validated ice microphysics scheme (Spichtinger and Gierens, 2009a). Additionally, we implemented a fast radiation transfer code (Fu et al., 1998). Using idealized profiles with high ice supersaturations up to 144% and weakly stable stratifications with Brunt-Vaisala frequencies down to 0.018 s−1 within a supersaturated layer, the influence of radiation on the formation of cirrus clouds is remarkable. Due to the radiative cooling at the top of the ice supersaturated layer with cooling rates down to -3.5 K/d, the stability inside the ice supersaturated layer decreases with time. During destabilization, small eddies induced by Gaussian temperature fluctuations start to grow and trigger first nucleation. These first nucleation events then induce the growth of convective cells due to the radiative destabilization. The effects of increasing the local relative humidity by cooling due to radiation and adiabatic lifting lead to the formation of a cirrus cloud with IWC up to 33 mg/m3 and mean optical depths up to 0.36. In a more stable environment, radiative cooling is not strong enough to destabilize the supersaturated layer within 8 h; no nucleation occurs in this case. Overall triggering of cirrus clouds via radiation works only if the supersaturated layer is destabilized by radiative cooling such that small eddies can grow in amplitude and finally initialize ice nucleation. Both processes on different scales, small-scale eddies and large-scale radiative cooling are necessary.

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