Article ID Journal Published Year Pages File Type
668046 International Journal of Thermal Sciences 2015 11 Pages PDF
Abstract
Experimental results for the two-phase thermal conductivity (often called “effective thermal conductivity”) with stagnant fluid at temperatures up to 1200 K for different ceramic sponges (variation of material, porosity and cell density) are presented in this publication. A two-plate test facility was used for the experiments. Samples investigated have porosities higher than 75% and cell densities in the range of 10-45 ppi (pores per linear inch). They are made of alumina, mullite and oxidic-bonded silicon carbide. The two-phase thermal conductivity is strongly dependent on temperature, porosity and cell sizes of the sponge sample. A model based on the superposition of the two heat transfer mechanisms, thermal conduction and thermal radiation is used to predict the two-phase thermal conductivity of ceramic sponges. A model based on combination of thermal resistances is suggested for predicting the thermal conductivity. The so-called Rosseland equation is used as an initial model for predicting the part of thermal radiation on the two-phase thermal conductivity. Measurements of material properties are included in this work as model implementation requires an exact knowledge of sponge data.
Related Topics
Physical Sciences and Engineering Chemical Engineering Fluid Flow and Transfer Processes
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