On the Potential of the Mie Theory and the Simulation Approach in Investigating Spectral-Kinetic Coefficients of Ultraporous Thermal Protective Materials

Autor: Oleg M. Alifanov, V. V. Cherepanov
Rok vydání: 2021
Předmět:
Zdroj: Journal of Engineering Physics and Thermophysics. 94:548-558
ISSN: 1573-871X
1062-0125
Popis: Certain capabilities of the original combined statistical simulation mathematical model covering the structure and physical properties of fibrous and reticulated high-temperature materials have been shown. An important element of the model is a "virtual scanner" developed earlier, i.e., a software tool making it possible to investigate the pattern of interaction between electromagnetic radiation and orthogonal representative elements of materials. Free parameters have been described and tests of both the spectral part of the model based on the Mie theory and the joint model, which confirm their adequacy, have been presented. The behavior of local spectra of transmission, absorption, and scattering of electromagnetic radiation of a number of the existing and hypothetical materials has been studied. In certain reticulated materials, the authors recorded an "order catastrophe" in the absorption spectrum: an abrupt and strong, of several orders of magnitude, change in the spectral absorption coefficients, that is not associated with resonance phenomena in absorption. The presence of a fairly wide resonance region was recorded in the transmission spectrum of an amorphous-quartz-based fibrous material and the parameter affecting the location of this region was found.
Databáze: OpenAIRE
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