| Autor: |
Suleiman, B., Gustafsson, S.E., Karawacki, E., Glamheden, R., Lindblom, U. |
| Zdroj: |
Journal of Thermal Analysis & Calorimetry; Feb1998, Vol. 51 Issue 2, p349-360, 12p |
| Abstrakt: |
The transient plane source technique (TPS) is used at low temperature to measure the thermal conductivity of two poly cry stalline granite samples. A brief description of the technique is included. Our measurements revealed that both samples exhibited weakly temperature dependent conductivity in the relevant temperature range. An attempt was made to examine the problem of determining the bounds and/or estimating the effective thermal conductivity of a multiphase system given the volume fractions and the conductivities of the components. The attempt was to compare the measured data at room temperature with theoretical results. These results are obtained using different models including those of the Effective Medium Theory (EMT), Hashin and Shtrikman (HS) bounds, Wiener bounds, and weighted geometric mean model. The models can be used to characterise macroscopic homogeneous and isotropic multiphase materials either by determining the bounds for the effective thermal conductivity and/or estimating the overall conductivity of the random mixture. According to our calculations for these kinds of crystalline rocks, the effective medium theory produced calculated results that agreed best with the measured conductivity values. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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