Abstract
This article presents a simple thermal characterization method, noted CFM, for the measurement of the apparent thermal conductivity of insulating materials at high temperature (i.e., up to 600 °C). The CFM method is a steady-state relative measurement method which requires a calibration. The calibration of the experimental apparatus was done with a calcium silicate board of known thermal conductivity. Thermal conductivity measurements were carried out on a low-density compressible fibrous felt and a high-density calcium silicate board between 100 and 600 °C. A good agreement was observed with the values obtained with the guarded hot-plate (GHP) method for the low-density fibrous felt and the parallel hot-wire (PHW) method for the high-density calcium silicate board. The measurement of the apparent thermal conductivities of low-density fibrous felts of different apparent densities, combined with a simple conducto-radiative model, allowed to estimate a mean specific extinction coefficient in good agreement with a value derived from transmittance/reflectance measurements.
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YJ, VS and IB worked on the design of the CFM method and on the choice of the different equipments and materials. YJ and JM carried out the uncertainty calculations. MC and JM carried out the experimental study. YJ, JM and VS realized the interpretation of the results. All authors read and approved the final manuscript.
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Jannot, Y., Meulemans, J., Schick, V. et al. A Comparative Fluxmetric (CFM) Method for Apparent Thermal Conductivity Measurement of Insulating Materials at High Temperature. Int J Thermophys 41, 94 (2020). https://doi.org/10.1007/s10765-020-02676-x
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DOI: https://doi.org/10.1007/s10765-020-02676-x