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Numerical and experimental analyses of the radiant heat flux produced by quartz heating systemsA method is developed for predicting the radiant heat flux distribution produced by tungsten filament, tubular fused-quartz envelope heating systems with reflectors. The method is an application of Monte Carlo simulation, which takes the form of a random walk or ray tracing scheme. The method is applied to four systems of increasing complexity, including a single lamp without a reflector, a single lamp with a Hat reflector, a single lamp with a parabolic reflector, and up to six lamps in a six-lamp contoured-reflector heating unit. The application of the Monte Carlo method to the simulation of the thermal radiation generated by these systems is discussed. The procedures for numerical implementation are also presented. Experiments were conducted to study these quartz heating systems and to acquire measurements of the corresponding empirical heat flux distributions for correlation with analysis. The experiments were conducted such that several complicating factors could be isolated and studied sequentially. Comparisons of the experimental results with analysis are presented and discussed. Good agreement between the experimental and simulated results was obtained in all cases. This study shows that this method can be used to analyze very complicated quartz heating systems and can account for factors such as spectral properties, specular reflection from curved surfaces, source enhancement due to reflectors and/or adjacent sources, and interaction with a participating medium in a straightforward manner.
Document ID
19940023156
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Turner, Travis L.
(NASA Langley Research Center Hampton, VA, United States)
Ash, Robert L.
(Old Dominion Univ. Norfolk, VA., United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1994
Subject Category
Acoustics
Report/Patent Number
L-17081
NASA-TP-3387
NAS 1.60:3387
Accession Number
94N27659
Funding Number(s)
PROJECT: RTOP 505-63-50-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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