Thermal Conductivity of Ceramic Sponges at Temperatures Up to 1000°c

Dietrich, Benjamin; Fischedick, T.; Wallenstein, M.; Kind, Matthias

doi:10.1615/.2015012330

Cited by 6 publications

(2 citation statements)

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“…Due to the numerical process of elaboration, well detailed furthermore in Ref. [12], pores have an ellipsoidal shape as it the case for real open-cell foam elaborated with the polymeric replication method [1,6,7]. We have verified that the 3 volumes are higher than the useful for the computation of the volumetric radiative properties.…”

Section: Mesoscopic Temperature Dependence Of the Homogenized Radiatimentioning

confidence: 60%

“…This is the case for the effective thermal conductivity, especially when thermal radiation dominates heat transport for temperatures higher than 1000 K [6]. On one hand, experimental characterizations are carried out with difficulty above 1000 K [7] and, on the other hand, mathematical models allowing the quantification of the exact contribution of the radiative conductivity can lead to discordance. This lack of understanding leads, either to approximate design of the conversion systems or to overconsumption of energy for maintaining the operating temperature.…”

Section: Introductionmentioning

confidence: 99%

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COMBINING MICRO- MESO- AND MACRO-SCOPIC NUMERICAL METHODS FOR MULTISCALE RADIATIVE TRANSFER MODELING OF SiC-BASED FOAMS UP TO VERY HIGH TEMPERATURES

Badri

Biallais²,

Domingues

et al. 2018

International Heat Transfer Conference 16

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A general multiscale numerical approach is proposed to finely reproduce, up to 1300 K, the radiative heat transfers within alpha silicon carbide-based open-cell foams, with tuned chemical and textural features. The complete modeling is based on a thorough analysis performed at micro-, meso-, and macro-scopic scales. To gauge, at the microscopic scale, the influence of the electron-phonon coupling on the intrinsic optical properties of silicon carbide, a molecular dynamic method involving a modified Tersoff potential is used. Then, at the mesoscopic scale, with optical indices provided by our molecular dynamic simulations, a collision-based Monte Carlo ray tracing method is used for retrieving the homogenized radiative properties of the selected foams. Finally, at the macroscopic scale, for a set of foams (porosity ∼ 0.4-0.9), we used our micro-meso constructed radiative properties for calculating the propagation of radiation by solving the radiative transfer equation using the vectorial finite element method. In addition, a fictitious foam constructed using heavily chemical doping at microscopic level, is put forward to change the volumetric propagation of the thermal radiation.

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Section: Mesoscopic Temperature Dependence Of the Homogenized Radiatimentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%