Accession Number : AD0701445

Title :   NON-DIFFUSIVE EFFECTS IN THE RADIATIVE PROPAGATION OF A THERMAL PULSE.

Descriptive Note : Technical rept.,

Corporate Author : MARTIN MARIETTA CORP BALTIMORE MD RESEARCH INST FOR ADVANCED STUDIES

Personal Author(s) : Traugott ,Stephen C.

Report Date : DEC 1969

Pagination or Media Count : 43

Abstract : The very early, pre-hydrodynamic transport of energy by radiation in a strong explosion is studied, taking departures from the Rosseland diffusion approximation into account. Similarity solutions exist for the plane, cylindrical, and spherical cases when the grey absorption coefficient varies as a power of temperature which is 1, 1/2, and 1/3 respectively. Solutions are found for the plane and spherical case using both the technique of matched asymptotic expansion and numerical integration. These solutions allow computation of temperatures and heat flux as a function of time, distance from the center, and energy release. Non-diffusive radiation leads to a relatively cool precursor to the main portion of the thermal wave. This precursor is much less pronounced in the spherical case. It is also found possible to predict the temperature visible to a distant observer. (Author)

Descriptors :   (*EXPLOSIONS, *THERMAL RADIATION), HEAT FLUX, TEMPERATURE, PULSES, PROPAGATION

Subject Categories : Explosions
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE