New Apparatus for Thermal Diffusivity and Specific Heat Measurements at Very High Temperature

Hay, Bruno; Barre, Stéphane; Filtz, Jean-Rémy; Jurion, M.; Rochais, Denis; Sollet, P.

doi:10.1007/s10765-006-0120-8

Cited by 16 publications

(7 citation statements)

References 6 publications

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“…At high temperatures, we used a special set-up already described in reference [25]. It consists essentially of an inductive furnace, a resistive furnace and a laser-FLASH diffusivimeter measuring the temperature rise at the rear face of the sample.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Experimental investigations of the coupled conductive and radiative heat transfer in metallic/ceramic foams

Coquard¹,

Rochais²,

Baillis

2009

International Journal of Heat and Mass Transfer

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Section: Experimental Apparatusmentioning

confidence: 99%

Experimental investigations of the coupled conductive and radiative heat transfer in metallic/ceramic foams

Coquard¹,

Rochais²,

Baillis

2009

International Journal of Heat and Mass Transfer

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“…Figure 1 exhibits the experimental thermogram acquired at a temperature of 2000 C and its counterpart obtained by a least-square method and based on the physical values of graphite at 2000 C. The agreement is excellent, the estimated value of the thermal diffusivity (9.8 Â 10 À6 m 2 s À1 ) is good, 10,11 and the high value of the coupled convectiveradiative heat exchange coefficient (%4100 W m À2 K À1 ) is consistent with the temperature level of the experiment (4 r T 3 % 2700 W m À2 K À1 when T ¼ 2273 K).…”

mentioning

confidence: 82%

Modeling of time-resolved coupled radiative and conductive heat transfer in multilayer semitransparent materials up to very high temperatures

Niezgoda

Rochais

Enguehard

et al. 2011

Applied Physics Letters

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International audienceThis paper presents an original modeling approach that enables the calculation of the temperature field within multilayer materials submitted to the flash method. The model takes into account the time-resolved coupled conducto-radiative heat transfer and the temperature of experiments. The compound can be subdivided into as many layers as desired, and their thicknesses and relevant physical properties can be chosen arbitrarily. Unconventional experimental thermograms can be reproduced faithfully by the calculations. This model, thus, makes it possible to correctly estimate the effective thermal diffusivity of semitransparent materials, thereby providing a deeper insight into the analysis of the physical phenomena involved. V C 2011 American Institute of Physics. [doi:10.1063/1.3664408] This study is part of a larger research project and its objective is to model the heat transfer in textured materials, such as foams and porous ceramics. 1,2 Modeling of the flash method, 3,4 in order to characterize the effective thermal dif-fusivity of specific materials, has been devoted a particular interest. The experimental thermograms (i.e., temperature versus time curves) that have been obtained for certain samples clearly demonstrated that conduction is not the only mode of heat transfer that occurs in these materials. Indeed, the phenomena that appear at very short times, e.g., a non-zero slope, a sharp temperature increase, a temperature step, point to the existence of radiative heat transfer as a result of the semitransparent nature of the materials. This semitrans-parent behavior can be explained by the texture of the materials as well as by their chemical composition from the local (i.e., the mean free path of the phonons) to the macroscopic scale. Moreover, our characterization studies have been conducted at several temperature levels including high temperatures where radiation becomes dominant. A model coupling both transfer modes (conduction and radiation) and taking into account the temperature level of the experiment was developed. This paper presents the validation of the model for a few cases, and it will be shown that unconventional thermograms collected on various samples can be quite satisfactorily reproduced by our model under the assumption of a one-dimensional heat transfer. Our model solves the heat transfer problem associated to the flash experiment applied to a 1D semitransparent cylindrical sample. In the case of a porous medium, no convec-tion transfer is assumed to take place according to Rayleigh's criteria. The front surface of the sample is submitted to a pulsed energy deposition of short duration, which is assumed to be uniform over the surface. The lateral surface is presumed to be adiabatic, whereas the front face and its opposite side (the back face) are submitted to boundary conditions of emission, diffuse reflection, and heat dissipa-tion through a coupled convective-radiative exchange coefficient. All these assumptions render it possible to develop a one-dimensional h...

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“…In this case the circular plates in both PIP and CVD states were tested by the flash method. The specific device used for the diffusivity measurements is described elsewhere [51]. The tests were performed in air from room temperature to 1000 °C, by increments of 200 °C.…”

Section: C)mentioning

confidence: 99%

Synthesis and properties of macroporous SiC ceramics synthesized by 3D printing and chemical vapor infiltration/deposition

Baux

Goillot

Jacques

et al. 2020

Journal of the European Ceramic Society

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Open porosity cellular SiC-based ceramics have a great potential for energy conversion, e.g. as solar receivers. In spite of their tolerance to damage, structural applications at high temperature remain limited due to high production costs or inappropriate properties. The objective of this work was to investigate an original route for the manufacturing of porous SiC ceramics based on 3D printing and chemical vapor infiltration/deposition (CVI/CVD). After binder jetting 3D-printing, the green α-SiC porous structures were reinforced by CVI/CVD of SiC using CH3SiCl3/H2. The multiscale structure of the SiC porous specimens was carefully examined as well as the elemental and phase content at the microscale. The oxidation and thermal shock resistance of the porous SiC structures and model specimens were also studied, as well as the thermal and mechanical properties. The pure and dense CVI/CVD-SiC coating considerably improves the mechanical strength, oxidation resistance and thermal diffusivity of the material.

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New Apparatus for Thermal Diffusivity and Specific Heat Measurements at Very High Temperature

Cited by 16 publications

References 6 publications

Experimental investigations of the coupled conductive and radiative heat transfer in metallic/ceramic foams

Experimental investigations of the coupled conductive and radiative heat transfer in metallic/ceramic foams

Modeling of time-resolved coupled radiative and conductive heat transfer in multilayer semitransparent materials up to very high temperatures

Synthesis and properties of macroporous SiC ceramics synthesized by 3D printing and chemical vapor infiltration/deposition

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