Effective thermal conductivity measurements by the transient hot - wire method: investigation of the interpretation procedure of experimental data

Abstract : The evaluation and control of self-ignition hazards in stored granular materials require accurate values of their thermal properties, and the transient hot-wire method can be used for the determination of the thermal conductivity. Starting from the usual model of Carslaw and Jaeger, improvements in the interpretation model for the experimental data produced in the conventional hot-wire device are presented, taking into account the contact resistance between the wire and the powder, as well as the finite dimensions of the cylindrical medium, and enabling the time domain for the interpretation of experimental data to be estimated. In addition, the deviation from the linear plot of temperature against logarithmic time was shown to be due to the temperature dependence of the heat power. The interpretation method was successfully applied to the determination of the thermal conductivity of four powders depending on the temperature; in particular, the results obtained with glass particle packed bed were compared with published data.
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Melika Baklouti, André Laurent. Effective thermal conductivity measurements by the transient hot - wire method: investigation of the interpretation procedure of experimental data. High Temperatures-High Pressures, Old City Publishing, 1997, 29, pp.295-307. ⟨hal-00746914⟩

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