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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

MODELS AND EXPERIMENTS FOR RADIATION PARAMETER ESTIMATION OF ABSORBING, EMITTING AND ANISOTROPICALLY SCATTERING MEDIA

Get access (open in a dialog) DOI: 10.1615/IHTC8.2690
pages 565-570

摘要

Although the mechanisms of heat transfer in porous media capable of absorbing, emitting and scattering thermal radiation are now fairly understood, quantitative predictions are often restricted due to the lack of data about the heat transfer properties of such media, particularly the radiation ones.
The purpose of this work is to develop a model and an experimental technique allowing the identification of the spectral absorption and scattering coefficients as well as the phase function shape of these materials.
The model developped is based on a discrete ordinates method coupled with a Hooke and Jeeves optimisation technique allowing the data reduction of spectral bidirectional transmittance (BDT) measurements .
The phase function has been approximated in this model by the Henyey-Greenstein normalized form.
A description is given of the experimental technique used and results obtained on pure silica fiberglass layers are presented and discussed.