EXPERIMENTAL TEST OF THEORIES FOR THE EFFECTIVE THERMAL-CONDUCTIVITY OF A DISPERSED COMPOSITE

被引:14
作者
KUTCHEROV, V [1 ]
HAKANSSON, B [1 ]
ROSS, RG [1 ]
BACKSTROM, G [1 ]
机构
[1] MOSCOW OIL & GAS INST,MOSCOW 117917,USSR
关键词
D O I
10.1063/1.351205
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 NaCl and low-density polyethylene (LDPE) was measured over the entire range of volume fraction at temperatures in the range 120-320 K together with pressures up to 1.73 GPa. Measurements were made using the transient hotwire method. The ratio of thermal conductivities of NaCl and LDPE varied over the range 10-50 at the temperatures and pressures employed. Using our results (together with previous data for AgCl-LDPE composites), we tested theoretical predictions from both the effective-medium approximation and the real-space renormalization group approximation. The two approximations exhibited a comparable overall level of agreement with experiment and neither was successful in describing our data within experimental inaccuracy over the entire range of volume fraction. For both approximations, the extent to which agreement with experiment was achieved depended significantly on the volume fraction being considered.
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页码:1732 / 1736
页数:5
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