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Calculated Estimate of the Thermal Conductivity of Exfoliated Vermiculite Layer between Black Walls

https://doi.org/10.56304/S2304487X22010102

Abstract

   The thermal conductivity of an exfoliated vermiculite layer of 0.7–2 and 4-8 mm fractions, which is represented as a gray heat-conducting absorbing (non-scattering) material enclosed between black walls, has been estimated at temperatures from 500 to 1300 K and normal atmospheric pressure. To simplify the problem, stationary conditions and a one-dimensional case are considered. The hypothesis of local thermodynamic equilibrium is accepted. Radiation is assumed to be incoherent, unpolarized, and concentrated between black walls. The change in the emissivity with increasing temperature is also taken into account. The resulting relative deviation of the estimated thermal conductivity coefficient from its experimental values in a wide temperature range is no more than 15 % and has a high correlation coefficient, which may mean that the described method of determining the thermal conductivity coefficient as a property of expanded vermiculite can be applicable. The technique can assumingly provide satisfactory results for some other heat-insulating materials with known parameters such as temperatures at boundaries and sample thickness.

About the Authors

A. V. Skurikhin
National Research University Moscow Power Engineering Institute
Russian Federation

111250

Moscow



A. V. Kostanovsky
National Research University Moscow Power Engineering Institute; Joint Institute for High Temperatures, Russian Academy of Sciences
Russian Federation

111250

125412

Moscow



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For citations:


Skurikhin A.V., Kostanovsky A.V. Calculated Estimate of the Thermal Conductivity of Exfoliated Vermiculite Layer between Black Walls. Vestnik natsional'nogo issledovatel'skogo yadernogo universiteta "MIFI". 2022;11(1):9-21. (In Russ.) https://doi.org/10.56304/S2304487X22010102

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