Directional Spectral Emittance of A Packed Bed : Influence of The Temperature Gradient in The Medium  

Oleh:

Sacadura, Jean-Francois ; Baillis, Dominique

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 124 no. 5 (Oct. 2002), page 904-911.
Topik: Temperature Gradient; spectral emittance; packed bed; temperature gradient; medium

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.5 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Recently a new experimental set - up for measuring the directional spectral emittance has been developed. Both sides of packed opaque spheres are simultaneously heated with identical power laser beams (CO2 10.6 µm) and the isothermal condition in the medium is assumed. In this paper we consider the coupled conduction - radiation equations to investigate the effect of the temperature nonuniformity on the calculated value of the emittance and to verify if the isothermal assumption is valid. Moreover, the sensitivity of the emittance and the temperature profile to the values of parameters (such as the porosity, the face temperatures, and the particle hemispherical reflectivity, etc.) is studied.

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