Experimental and theoretical studies of the influence of surface conditions on radiative properties of opaque materials

Autor: H. Tran N'Guyen, M. Huetz-Aubert, Ph. Demont
Rok vydání: 1982
Předmět:
Zdroj: International Journal of Thermophysics. 3:335-364
ISSN: 1572-9567
0195-928X
Popis: Radiative properties of opaque materials strongly depend on their surface condition. The fabrication of superficial cavities of various forms and dimensions modifies the directional spectral emissivities or absorptivities. They are usually increased compared to those of optically smooth material; the gain depends on the material, the type of cavities, as well as the wavelength λ and the direction Δ of the emitted or incident radiation. When grooves of dimensions larger than λ are fabricated in a sample, the models, taking into account the successive reflections on their inner sides, give a good agreement with experimental data. But a similar theory does not explain the substantial increase of the infrared emissivity of ballblasted samples.
Databáze: OpenAIRE
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