Thermal diffusivity measurement of insulating materials at high temperature with a four-layer (4L) method
作者： Yves Jannot , Alain Degiovanni , Vincent Schick , Johann Meulemans
DOI: 10.1016/J.IJTHERMALSCI.2019.106230
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摘要: Abstract This article presents a temperature-temperature thermal characterization method for the measurement of diffusivity insulating materials at high temperature. novel method, noted 4L, is transient absolute based on estimation transfer function center symmetrical stack composed two specimen an material sandwiched between conductive metallic plates. Two different direct 1D semi-analytical models were developed. The first one considers purely opaque and second takes into account coupling radiative heat modes scattering semi-transparent materials. model was used to estimate (calcium silicate boards) up 800 °C with accuracy better than 10%. (ceramic foam) 1000 °C approximately identify significant errors occurring if conducto-radiative also average value mean extinction coefficient material.
univ-lorraine.fr
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