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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.

Geothermal features of the Earth's lower mantle: phonon thermal conductivity

Maj S.

Acta Geophysica Polonica

2005

Vol. 53, nr 2

183-196

A modified relationship between the phonon thermal conductivity and seismic parameter ? for silicate/oxide geomaterials is derived. The considerations are based on Debye's model of solids and on the seismic equation of state. This new relationship suggests that the phonon thermal conductivity values at the mantle/core boundary may be of about 11-14 W/mźK. Our result is in a sufficient agreement with independent laboratory data from the laser-heated diamond-anvil cell at very high pressures.

Phonon thermal conductivity of geomaterials: relationship to the seismic parameter fi

Maj S.

Acta Geophysica Polonica

2002

Vol. 50, nr 1

69-78

A logarithmic relationship between the phonon thermal conductivity under normal conditions and seismic parameter F (or square of the hydrodynamical velocity of sound) for silicate and oxide minerals related to the Earth's interior is proposed. The considerations are based on Debye's theory of solid phase and on the seismic equations of state for minerals. In numerical calculations the thermodynamical laboratory data of several main silicates were also used.

Phonon thermal conductivity of geomaterials: relationship to the density and mean atomic weight

Maj S.

Acta Geophysica Polonica

1998

Vol. 46, nr 4

415-425

A power relationship between the phonon thermal conductivity under normal conditions and density/mean atomic weight ratio for geomaterials or silicates and oxides realated to the Earth's lithosphere is proposed. The considerations are based on Debye's theory of solid and on the seismic equation of state for minerals. In numerical calculations the thermodynamical laboratory data of sixty-three various silicates and oxides were also used.