ON THE POTENTIAL OF THE MIE THEORY AND THE SIMULATION APPROACH IN INVESTIGATING SPECTRAL-KINETIC COEFFICIENTS OF ULTRAPOROUS THERMAL PROTECTIVE MATERIALS

Certain capabilities of the original combined statistical simulation mathematical model covering the structure and physical properties of fi brous 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 confi rm 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 coeffi cients, 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 fi brous material and the parameter affecting the location of this region was found.
Certain capabilities of the original combined statistical simulation mathematical model covering the structure and physical properties of fi brous 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 confi rm 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 coeffi cients, 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 fi brous material and the parameter affecting the location of this region was found.
Author:  V. V. Cherepanov and O. M. Alifanov
Keywords:  high-temperature porous materials, radiation spectral-kinetic coeffi cients, modeling, phase transitions
Page:  548-557