Inscrição na biblioteca: Guest

ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

Radiative Heat Transfer in Thermal Powder Insulations

Get access (open in a dialog) DOI: 10.1615/IHTC10.4940
pages 51-56

Resumo

Radiative transfer in loose powder beds can be described by a series of single scattering and absorption processes. When solving the equation of radiative transfer, the anisotropy of the single scattering process is taken into account by employing scaling laws which invole the factor of asymmetry g. This quantity can be obtained by performing directional-hemispherical and directional-directional measurements, g can also be determined from the angular distribution of the single scattering process, using a polar nephelometer.
The scattering properties of the powders can be correlated with the effective extinction of the powder and thus with the radiative conductivity λ rad.
Measurements on TiO2 and diatomite powders show good agreement in the values of g derived with the above methods. Mie calculations support the experimental results.