Improvement of the Two-Temperature Radiative Transport Model
Autor: | Gerald L. Kulcinski, Ihor O. Bohachevsky, Gregory A. Moses, Thomas J. McCarville |
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Rok vydání: | 1984 |
Předmět: |
Physics
Field (physics) Opacity 020209 energy General Engineering Radiant energy 02 engineering and technology 01 natural sciences Electromagnetic radiation 010305 fluids & plasmas Thermal radiation Brightness temperature 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Plasma diagnostics Atomic physics Inertial confinement fusion |
Zdroj: | Nuclear Technology - Fusion. 5:5-16 |
ISSN: | 0272-3921 |
Popis: | The frequency dependence of a thermal radiation field complicates the computation of radiative energy transport in optically thin media because the spectrum may be uncoupled from local thermodynamic conditions. A model for combining the effect of the frequency dependence into a radiation temperature chosen to represent the temperature of both local and nonlocal emitting regions is described. The derived equations are much easier to solve than the frequencydependent equations and can be applied to a broad class of problems. The equations are used to investigate the response of a gas in an inertial confinement fusion (ICF) reaction chamber to target explosions. The response is compared for ambient densities of 1.77 x 10/sup 18/ and 1.77 x 10/sup 17/ atom/cm/sup 3/. The error in using the brightness temperature instead of a color temperature to evaluate the opacities is illustrated. An analytic analysis shows the cooling wave observed from energy releases > 10/sup 18/ erg will not occur in an ICF cavity. This is confirmed by the numerical calculations. |
Databáze: | OpenAIRE |
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