EFFECTIVE THERMAL-CONDUCTIVITY OF BINARY DISPERSED COMPOSITES OVER WIDE RANGES OF VOLUME FRACTION, TEMPERATURE, AND PRESSURE

被引:37
作者
HAKANSSON, B
ROSS, RG
机构
[1] Department of Experimental Physics, University of Umeå
基金
美国国家科学基金会;
关键词
D O I
10.1063/1.346379
中图分类号
O59 [应用物理学];
学科分类号
摘要
The effective thermal conductivity of binary dispersed composites prepared from mixed and compacted powders of AgCl and low-density polyethylene was measured over the entire range of volume fraction at temperatures in the range 100-330 K together with pressures up to 1.75 GPa. Measurements were made using the transient hot-wire method. The ratio of the thermal conductivities of AgCl and LDPE was an adjustable parameter in the range 2-8 at the temperatures and pressures employed. The rigorous effective medium approximation (EMA) provided a good description for most of our results although some limits to its applicability were also indicated. An empirical theory due to Nielsen provided a significantly less successful description. Suggestions are made for an improved theoretical approach going beyond the limits of the EMA.
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页码:3285 / 3292
页数:8
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