Heat transfer in load-bearing diatomite powder insulations

被引：0

作者：

Degen, K.G. ^{[1
]}

Huemmer, E. ^{[1
]}

Caps, Roland ^{[1
]}

Fricke, Jochen ^{[1
]}

机构：

[1] Univ of Wuerzburg, Germany

来源：

High Temperatures - High Pressures | 1988年 / 20卷 / 05期

关键词：

Heat Transfer - Silica - Spectrometers; Infrared - Thermal Conductivity;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Evacuated ground diatomite was investigated in a load-controlled hot plate system. The measured dependence of the solid thermal conductivity, λsc, on the external pressure load, Pext, can be approximated by λsc ∝ Pext1/20 for Pext between 0.1 and 10 bar. While λsc shows the same slight increase with temperature as the solid conductivity of nonporous amorphous silica (SiO2), the radiative conductivity, λr, displays a proportionality λr ∝ Tα with α 4.4. The caloric data were supplemented by infrared transmission measurements taken with a Fourier Transform Infrared (FTIR) spectrometer. The derived wavelength-averaged specific extinction coefficient, e¯, decreases with temperature; e¯ ∝ T-β with β 1.4, consistent with the caloric data.

引用

页码：593 / 598