Calculation of the Thermal Conductivity of Exfoliated Vermiculite and Its Comparison with Experimental Data
https://doi.org/10.56304/S2304487X21060110
Abstract
The thermal conductivity of exfoliated vermiculite has been estimated within the porous body model called in this work the model of multilayer wall with jumpers. The properties of a solid frame (matrix) of this wall are taken from the preliminary experiments on the chemical composition (X-ray methods), porous structure (mercury porometry), thermal conductivity (stationary method and hot wire method), and absorption coefficient (infrared Fourier spectroscopy). The thermal conductivity of the solid matrix has been calculated using more than 20 existing algorithms. The problem of complex heat exchange under the stationary conditions of local thermodynamic equilibrium from 470 to 1270 K has been formulated and solved within the model of multilayer wall with jumpers. The one-dimensional case with closed rectangular parallelepiped pores and smooth walls. Pores are filled with dry air at atmospheric pressure. The method of the calculation of the stationary thermal radiation flux density inside the porous body with effective absorption, reflection, and transmission coefficients has been described. Radiation is considered as noncoherent, unpolarized, and isotropic. The method of the calculation of the thermal conductivity is presented and results are compared to experimental values of the thermal conductivity. It is assumed that the proposed method can be applicable to other porous inorganic bodies.
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Review
For citations:
Skurikhin A.V. Calculation of the Thermal Conductivity of Exfoliated Vermiculite and Its Comparison with Experimental Data. Vestnik natsional'nogo issledovatel'skogo yadernogo universiteta "MIFI". 2021;10(6):493-504. (In Russ.) https://doi.org/10.56304/S2304487X21060110
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