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• W210680934 abstract "Translucent materials capable of selectively reflecting, transmitting, absorbing, and scattering radiation from external heat sources and background ratiation are in use in a number of thermally loaded structures and are being considered for more such applications. The empirical literature data on the thermophysical properties (TPP) of translucent scatterers in the high-temperature region -- where radiative heat transfer is important -- is of an approximate nature. Heat transfer occurs in translucent materials simultaneously by'conduction and radiation, and the temperature and radiation fields in the materials are coupled. Thus, without isolation of the individual components of heat transfer -- conductive and radiative -- experimental data on the thermal conductivity and diffusivity of translucent materials cannot be widely used in heat-engineering calculations because they apply only to specific empirical conditions of heat transfer for the given specimen. The feasibility of using well-known experimental methods of the thermophysics of the optical media [i] to correctly determine TPP and to isolate the individual components of heat transfer in translucent scattering materials ~s problematic for several reasons. First, mathematical models of inverse coefficient problems of radiative--conductive heat transfer (IPRCT) do not consider such important features of heat transfer as multiple scattering of radiation in absorbing and radiating media. Second, translucent scatterers are generally poor heat conductors. For these materials, as for other thermal insulators, despite the volumetric character of heating it is possible to create small temperature gradients and heating rates in the specimen only in a long experiment employing complicated equipment. We add that determining the optical properties of translucent scatterers at high temperatures is a complicated problem by itself. In this connection, it is important to develop new experimental methods that will make it possible to efficiently determine the TPP of translucent scattering materials in the regime of intensive nonsteady heating. We will examine a physical and mathematical model of heat transfer in a translucent scattering material for the conditions of stand heat-engineering tests [2]. We will assume that the frontal surface of the plane specimen of isotropic translucent scattering material is heated by a radiation flow of a known spectral composition and density. The coefficient of heat transfer to the gaseous medium on the front surface and the temperature dependence of the optical properties of the material (absorption coefficient ~, scattering coefficient B, and refractive index n) are assumed to be known. The rear surface of the specimen is thermally insulated. Experimental thermograms are taken at one or several points of the specimen during heating. It is necessary to determine the temperature dependence of the thermal conductivity and volumetric specific heat of the material. Heat transfer in a translucent scattering material is described by a system of equations which includes the equations of heat conduction and radiation and the corresponding boundary" @default.
• W210680934 created "2016-06-24" @default.
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• W210680934 date "1986-01-01" @default.
• W210680934 modified "2023-09-27" @default.
• W210680934 title "A method is proposed for determining the thermophysical properties of translucent scattering materials in the nonsteady heating regime." @default.
• W210680934 hasPublicationYear "1986" @default.
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