Microscopic thermal characterization of HTR particle layers

Rochais, Denis; Meur, G. Le; Basini, Virginie; Domingues, Gilberto

doi:10.1016/j.nucengdes.2007.11.025

Cited by 17 publications

(14 citation statements)

References 15 publications

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“…The variation of the slope clearly indicates different thermal properties for each layer. The extracted thermal conductivity values are summarized in Table II and compared to a previous work 77 and values used in PARFUME fuel performance code. 78 We see a reasonable agreement between our and previously published results with the exception of buffer layer.…”

Section: Measurement In Compositesmentioning

confidence: 99%

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

et al. 2016

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Thermal transport in materials used for energy applications is a physical process directly tied to performance and reliability. As a result, a great deal of effort has been devoted to understanding thermal transport in materials whose ability to conduct heat is critical. Here, our objective is to discuss the utility of laser-based thermoreflectance (TR) approaches that provide microscale measurement of thermal transport. We provide several examples that implement the TR technique to investigate thermal transport in materials used in nuclear energy applications. First, we discuss utility of this technique to measure thermal conductivity in ion irradiated ceramic materials during investigations where the primary objective is to understand the impact of radiation induced crystalline structure defects on thermal transport. We also present the capability of TR approach to resolve thermal conductivity of each layer in tristructural isotropic fuel, silicon carbide fiber composites, and 2nd phase precipitates in uranium silicide. Finally, the ability to measure interface thermal resistance between adjacent layers in composites is demonstrated.

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Section: Measurement In Compositesmentioning

confidence: 99%

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

et al. 2016

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“…Usually, the relative uncertainty on the thermal diffusivity estimation is less than few percent and the identified equivalent gaussian radius at e À1 is smaller than 1 mm [25].…”

Section: Microscopic Photothermal Measurement E Thermal Wavementioning

confidence: 99%

“…To circumvent these problems, first, the foam has been impregnated with a glue ceramic (stable until 900 C) to obtain a mirror polished surface without glue marks on the mullite skeleton, and second, a MoSi 2 coating of 150 nm ± 10 nm thickness has been deposited on the polished sample surface. The choice of this material is justified by its good behavior in temperature [25]. The pump energy is then absorbed by the coating and thermal wave travels through the MoSi 2 coating and the mullite skeleton.…”

Section: Measurement Of the Thermal Diffusivity Of A Mullite Foam Solmentioning

confidence: 99%

Microscopic thermal diffusivity measurements of ceramic and metallic foams lumps in temperature

Rochais

Coquard

Baillis

2015

International Journal of Thermal Sciences

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“…In the absence of external sources and in the case of the steady state condition, the distribution of  (for all conduction or diffusion phenomena) in the material is governed by the diffusive transport equation [14]:…”

Section: Effective Diffusion Coefficient Calculationmentioning

confidence: 99%

“…Table 1). This equation is solved using an implicit finite difference method based on a conjugate gradient algorithm [14]. Different Dirichlet boundary conditions are fixed on two opposite faces ( For the equivalent homogeneous material, the average conduction flux Φ can be written [14]:…”

Section: Effective Diffusion Coefficient Calculationmentioning

confidence: 99%

3D FIB reconstruction and characterisation of a SOFC electrode

Chupin¹,

Vivet²,

Rochais³

et al. 2011

Materials Characterisation V

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SOFC (Solid Oxide Fuel Cells) appear to be a great alternative way to produce electricity from hydrogen with high efficiency and no greenhouse gas emissions. SOFC are efficient at high temperatures (around 800°C) and are meant to be used for stationary applications as heat and electric co-generation devices. To understand how gases, electricity and heat flow through these media and to improve their efficiency, it is critical to know the actual microstructure of these electrodes. The studied electrodes are Ni-YSZ cermets in which characteristic element sizes are around 1m. The 3D microstructure has been reconstructed using FIB (Focused Ion Beam) tomography. This technique has been used on several samples (different Ni-YSZ proportions) and gives representative 3D volumes of around 10×10×10µm with a 10nm resolution. Theses 3D volumes are then analysed to extract some important structural parameters such as volumetric proportions, active surfaces, connectivity of each components and "three phase boundaries" (TPB). Then, the 3D reconstructed volumes have been used to determine homogeneous media equivalent properties such as thermal, ionic and electric conductivities. These homogeneous equivalent properties are estimated using a hot guarded plate simulation that takes into account each component properties and the 3D structure.

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Microscopic thermal characterization of HTR particle layers

Cited by 17 publications

References 15 publications

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications

Microscopic thermal diffusivity measurements of ceramic and metallic foams lumps in temperature

3D FIB reconstruction and characterisation of a SOFC electrode

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