Abstract
Abstract SiC foam ceramics are extensively used in numerous industrial applications that require high-temperature conditions. They can be used as thermal insulation, structural catalyst supports and energy storage materials. In this article, effective thermal conductivity of SiC foam ceramics at high temperature is studied by steady plane heat source method. This research aims to investigate the variations of effective thermal conductivity with pore density, stacking thickness, heat source temperature, and pore arrangement structure of foam ceramics. By a comparison of effective thermal conductivities of various pore density ceramic sheets, the experimental results show that the effective thermal conductivity of foam ceramics decreases with the increase of the pore density and stacking thickness. The effective thermal conductivity of the foam ceramics increases significantly when the heat source temperature is more than 200°C. For modular SiC foam ceramics, increasing the average pore density and sudden change of the pore density between ceramic sheets are not conducive to the increase of the effective thermal conductivity.
Highlights
Foam ceramics are widely used in many engineering fields due to their large specific surface area, high heat transfer efficiency, and uniform mixing of fluids
This study provides insight into the understanding of effective thermal conductivity of modular SiC foam ceramics and has reference value for the design of thermal insulation materials and energy storage materials
The sudden change in pore density weakens the radiative heat transfer between the foamed ceramic sheets, resulting in a decrease in the effective thermal conductivity. These results indicate that a nonuniform porous medium with a larger average pore density has a smaller effective thermal conductivity
Summary
Foam ceramics are widely used in many engineering fields due to their large specific surface area, high heat transfer efficiency, and uniform mixing of fluids. The parameter, effective thermal conductivity, is a major concern in predicting the heat transfer efficiency of systems, such as porous media combustion system [1], heat exchangers [2], and solar collectors [3]. Many researchers have paid attention to heat transfer in SiC foam ceramics from different perspectives. Investigation of effective thermal conductivity of SiC foam ceramics 59 numerical simulations [6,7], researchers mostly focused on effects of temperature, pore parameters, and solid thermal conductivity on effective thermal conductivity of SiC foam ceramics. Nemoto et al [8] investigated thermal conductivity of foam ceramics at low temperature.
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