NDLI: Estimation of the Mean Thermal Conductivity of Anisotropic Materials

Content Provider	Springer Nature Link
Author	Ohmura, T. Tsuboi, M. Tomimura, T.
Copyright Year	2002
Abstract	An estimation method of the plane directional thermal conductivity of fibrous insulations using the cyclic heat method and the transient hot-wire method is proposed. By assuming that the thermal conductivity λ $_{ h }$ of anisotropic materials measured by the transient hot-wire method is equivalent to that of the isotropic materials which have the same bulk density ρ and specific heat c as the anisotropic materials, the thermal conductivity λ $_{ h }$ is shown to be equal to $$\sqrt {\lambda _x \lambda _y } $$ , which is a geometrical mean of the thermal conductivities in the direction of the plane λ $_{ x }$ and the thickness λ $_{ y }$ of the anisotropic materials. For an alumina silica blanket (ρ=125 kg·m$^{−3}$), the thermal conductivities λ $_{ h }$, λ $_{ x }$, and λ $_{ y }$ were measured in the temperature range between −140 and 300°C using the transient hot-wire method for λ $_{ h }$ and the cyclic heat method for λ $_{ x }$ and λ $_{ y }$. In the same way, the thermal conductivities λ $_{ h }$, λ $_{ x }$, and λ $_{ y }$ of a rock wool (ρ=121 kg·m$^{−3}$) insulation were also measured in the temperature range, 100 to 600°C. From a comparison of the measured results with the estimated values of λ $_{ x }$, it is confirmed that the proposed method can estimate the measured values reasonably well.
Starting Page	843
Ending Page	853
Page Count	11
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	23
Issue Number	3
e-ISSN	15729567
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Mechanics Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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