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2 Journal of New Technologies in Environmental Science

2 2019

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Thermal conductivity calculation method: porous structures

Pavlenko Anatoliy, Cheilytko Andrii O., Ilin Sergii, Belokon Yevgen

Journal of New Technologies in Environmental Science

2019

Vol. 3, nr 4

194--205

The article describes the transfer of thermal energy through porous bodies with closed and open porosity. The semi-empirical equation for finding the effective coefficient of thermal conductivity of bodies with a porous structure is derived. The equation of finding the thermal permeability of the porous material and the geometric characteristics of the porous structure are presented.

Investigation of effective thermal conductivity in porous metallic materials

Koshlak Hanna V., Cheilytko Andrii O.

Journal of New Technologies in Environmental Science

2019

Vol. 3, nr 3

112--122

In this article, an analysis of impact of the form, size and location of pores on the effective thermal conductivity coefficient of porous metallic materials is presented. It is shown the influence of porosity parameters separately on the electronic and phonon; convective and radiation component of effective thermal conductivity. The distribution of the heat flow and temperature in the experimental samples were analyzed. Form and location of pores, which give opportunity to reached minimum electronic and phonon thermal conductivity, and also the most significant factor (porosity parameter), which influence on the electronic and phonon thermal conductivity are found. The previously expressed hypothesis about the impact on the convective motions by not only pores size, but also temperature is confirmed. Dependence of convective and radiation heat conductivity from the pores size in the porous metal material was obtained.