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Caractérisation des propriétés thermiques de liquides semi-transparents à haute température : application aux liquides silicatés

Abstract : The study deals with the characterization of the thermal properties of semi-transparent liquids at high temperature: molten silicates. The characterization of such materials is particularly challenging because the contributions of the different heat transfer modes (conduction, convection and radiation) should be accounted for to allow the measurement of intrinsic properties. The experimental setup is based on a transient pulse method derived from the flash method. A heat flux stimulation is generated on the front face of an experimental cell, placed at the center of a tube furnace, with a continuous laser beam and the temperature rise is measured by an infrared detector on the opposite side. The modeling of the direct problem takes into account the conducto-radiative coupling by solving both the heat equation and the radiative transfer equation (RTE) for a gray emitting, absorbing but non-scattering medium with the spherical harmonics method (P1 approximation). The developed method allows to simultaneously estimate the thermal diffusivity and a mean (gray) absorption coefficient by an inverse method. The experimental results obtained on molten silicates with different radiative properties (i.e., different absorption coefficients) validate the characterization method developed and implemented in our work
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Submitted on : Tuesday, November 6, 2018 - 11:05:06 AM
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  • HAL Id : tel-01913316, version 1

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Johann Meulemans. Caractérisation des propriétés thermiques de liquides semi-transparents à haute température : application aux liquides silicatés. Thermique [physics.class-ph]. Université de Lorraine, 2018. Français. ⟨NNT : 2018LORR0134⟩. ⟨tel-01913316⟩

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