Thermal Conductivity of Ceramic Sponges at Temperatures up to 1000°C

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

doi:10.1615/ihtc15.pmd.008405

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Involvement of high-temperature physics implicates accurate prediction of heat transport as one of the primary factors for optimizing the global performance of these systems. As such, many researchers have focused on studying (numerically or experimentally) the behavior of open-cell cellular ceramics at high temperatures, especially at temperatures beyond 1200 K [7,8,9,10]. Complementary to these researches, the current article focuses on analyzing coupled conductive-radiative heat transport of topologically different open-cell cellular ceramics up to 1800 K.…”

Section: Introductionmentioning

confidence: 99%

“…for temperatures beyond 1200 K, numerical approaches are decisive for estimating the conduction-radiation coupling via the effective thermal conductivity [13]. This is because such temperatures are beyond the working range of current-day experimental facilities (guarded hot-plate, transient plane source, transient hot-wire technique), often applied for the characterization of effective thermal conductivity [7,8], or present hardly exploitable signals (laser flash technique) [14].…”

Section: Introductionmentioning

confidence: 99%

“…In this study we solve and analyze the conduction-radiation coupling (under vacuum) within discrete-scale ceramic samples operating at temperatures ranging from 1200 K to 1800 K. The finite element method is used to solve the underlying partial differential equations of the conduction-radiation physics. We focus our effort on SiC-based macroporous samples, this semiconducting material being intensively studied for designing high-temperature systems [31,8,32,29]. Our deterministic simulations are based on tightly coupled vectorial FE for solving the radiation physics and Galerkin FE for solving the conduction physics.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Conductive-radiative heat transfer within SiC-based cellular ceramics at high-temperatures: A discrete-scale finite element analysis

Badri

Favennec

Jolivet

et al. 2020

Finite Elements in Analysis and Design

View full text Add to dashboard Cite

Cellular ceramic materials possess many favorable properties that allow to develop efficient modern-day hightemperature thermal energy conversion systems and processes. The energy conversion within these porous media is governed by tightly coupled conduction-radiation physics. To efficiently design and optimize these systems, a comprehensive understanding of the conduction-radiation behavior within these materials becomes important. In this study, by performing large-scale numerical experiments, we analyze the conduction-radiation coupling characteristics within different (with respect to topology and porosity) SiC-based open-cell cellular ceramics surrounded by fictitious vacuum up to temperatures of 1800 K. To induct minimal approximations, our finite element simulations are based on a discrete-scale approach within which realistic discrete (porelevel) representations of the cellular ceramics are used as numerical media. The results presented in this study provide means to better understand the role of radiation in the coupled conduction-radiation physics within the ceramic samples. A detailed comparison on effectiveness of energy conversion is established for SiC-based full-scale cubic-cell, Kelvin-cell, and pseudo-random-cell ceramic structures which are at 80 % and 90 % porosity each. In conclusion, among the different standalone and full-scale ceramic samples, the Kelvin-cell structures at 90% porosity have proven to benefit the most from radiation coupling.

show abstract

Section: Introductionmentioning

confidence: 99%