NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Transient cooling of a square region of radiating mediumA time-accurate numerical solution was carried out for transient radiative cooling of a gray emitting and absorbing medium in a square two-dimensional region. The integro-differential energy equation for transient temperature distributions was solved in two stages. At each time increment, the local radiative source term was obtained by numerical integration of the temperature field using two-dimensional Gaussian integration over rectangular subregions. Then the differential portion of the equation was integrated forward in time by use of the local first and second time derivatives. The results were compared with available limiting case, and excellent agreement was obtained. Transient results are given for a wide range of optical thicknesses of the region. Optimum transient cooling is obtained when the optical side length is about 4.
Document ID
19920027808
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Siegel, Robert
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1991
Publication Information
Publication: Journal of Thermophysics and Heat Transfer
Volume: 5
ISSN: 0887-8722
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
92A10432
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available