THERMAL CONDUCTIVITY OF EVACUATED LOAD-BEARING POWDER AND FIBRE INSULATIONS UNDER VARIABLE EXTERNAL LOAD.

被引：0

作者：

Buettner, Dietrich ^{[1
]}

Fricke, Jochen ^{[1
]}

Reiss, Harald ^{[1
]}

机构：

[1] Univ Wuerzburg, Physikalisches Inst,, Wuerzburg, West Ger, Univ Wuerzburg, Physikalisches Inst, Wuerzburg, West Ger

来源：

| 1985年 / 17期

关键词：

HEAT TRANSFER - Mathematical Models;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

New measurements of the thermal conductivity of several evacuted load-bearing porous insulations at temperatures between 300 and 650 K are described. In an earlier set of measurements the external load was fixed at 1 bar. The large guarded hot plate device has now been altered to provide variable mechanical boundary conditions, and measurements have also been taken at smaller external loads (10 mbar-1 bar). Data are analyzed in terms of radiative and the solid conduction contributions to the measured total heat flow. The dependence of the solid conductivity on the external load is compared with a theoretical model.

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