Calculation of Characteristics of Reticular Materials based on a Glassy Carbon by its Optical Constants Determined Experimentally
| Autor: | A. G. Shchurik, Oleg M. Alifanov, V. V. Cherepanov, R. A. Mironov |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Composite number General Engineering chemistry.chemical_element Thermodynamics 02 engineering and technology Glassy carbon Condensed Matter Physics Thermal conduction 01 natural sciences 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Attenuation coefficient 0103 physical sciences Reticular connective tissue Radiative transfer 010301 acoustics Carbon Refractive index |
| Zdroj: | Journal of Engineering Physics and Thermophysics. 93:710-718 |
| ISSN: | 1573-871X 1062-0125 |
| Popis: | Results of experimental investigation of the spectrum of optical constants of a glassy carbon produced in Russia and of mathematical simulation, with them, of the spectral, kinetic, and thermophysical characteristics of composite reticular materials based on this carbon are presented. The investigations were performed with compacted samples of a composite reticular glassy carbon identical in physical properties to the glassy carbon forming the basis of highly porous cellular materials. By the hemispherical radiant reflectivity of these samples, illuminated at a right angle, the spectra of optical constants (the refractive index and the absorption coefficient) of the glassy carbon forming their basis were determined using the Kramers–Kronig relations, and a number of spectral characteristics of the composite reticular glassy carbon, related to these constants, were calculated by the simple approximate relations derived by us. The thickness of the skin layer in the samples of this composite was estimated, and some features of the interaction of the material of their fragments with an electromagnetic radiation were determined. The data on the spectral characteristics of the composite reticular glassy carbon were integrated into the statistical model developed earlier on the basis of the exact electromagnetic theory for simulating the optical properties of reticular materials having an ultrahigh porosity. This model allows one to estimate the features of the microstructure of such a material and the physical processes proceeding in it at different spatial and time scales. Results of calculations of the spectral and kinetic coefficients of the radiative transfer equation, the scattering indicatrix, the heat radiative conductivity, and the total heat conduction of the composite reticular glassy carbon are presented. The possibilities of the model proposed are demonstrated. |
| Databáze: | OpenAIRE |
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