Thermal transport-porosity-microstructural characteristics: unpicking the relationship in ultra-porous α-Al2O3 powder
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER（2023）
Abstract
•Thermal transport within ultraporous alumina is experimentally characterized.•Transient plane heat source method coupled with quadrupole inverse method is used.•Beyond a critical porosity the percolation of the thermal transport is highlighted.•Porosity-macrostructural parameters relationship is theoretically described.
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Key words
Thermal conductivity,Thermal diffusivity,Microstructural parameter,Multiscale model,Intraparticle porosity,Interparticle porosity,Grain size,Measurement,Transient hot plate,Thermal quadrupole method,Inverse problems,X-Ray tomography,Scanning electron microscopy,Theoretical model,Percolation theory
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