0000000000037332
AUTHOR
Alexander Gachkevich
Effect of laser radiation upon heat and mass transfer in two-component elastic semitransparent layer
Abstract In present paper the effect of the correlation between spectral radiative characteristics of different lasers and absorptive characteristics of laser irradiated two-component elastic semitransparent material upon coupled thermal, diffusive and elastic processes in the layer is examined. Irradiated material is supposed to consist of elastic matrix and gaseous admixture. Investigations are carried out within the model applied early to the study of mentioned coupled processes in the layer subjected to thermal infrared radiation. Calculations were carried out for four different infrared lasers. Peculiarities of heat and admixture mass transfer caused by laser irradiation are establishe…
Investigation of molecular gas admixture diffusion, heat transfer and stress state in amorphous solid subjected to thermal infrared radiation
Mathematical model for description of coupled mechanical, thermal, and diffusive processes in semitransparent amorphous solid with molecular gaseous admixture subjected to thermal infrared radiation was developed. Governing equations of the model were derived within thermodynamic model of hard mixture while microscopic considerations were involved for obtaining some constitutive equations. Above coupled processes were investigated in glass layer with either two-atomic CO admixture or three-atomic H2O admixture. Developed model allows design regimes for such technological problems as degassing glass elements of electro-vacuum devices, drying of low electro-conductive solids, deposition of pr…
Thermal behavior of absorbing and scattering glass media containing molecular water impurity
The effect of the presence of molecular water impurity of various concentrations in absorbing and scattering glass media on the temperature field in a layer subjected to thermal infrared radiation is investigated. The analysed medium is treated as a multicomponent medium consisting of glass matrix and water impurity. The effect of radiation on the medium is expressed by heat sources in each component due to absorption of radiation. It is shown that the presence of water impurity in the glass medium should be accounted for in order to predict the temperature distribution during radiation action. The effect of scattering of radiation by water molecules on thermal and diffusive processes in th…