The effects of solid phase thermal conductivity, pore thermal conductivity, and pore volume fraction on the measured effective thermal conductivity of porous ceramics with pore volume fractions of 4 to 95% were investigated. The experimental results were then compared with pre-existing numerical models. It was found that the Maxwell-Eucken relation for closed porosity and the Landauer relation for open porosity were able to closely predict the effective thermal conductivity for tin oxide, ...
Author(s): Arnaud Alzina, Benoit Nait-Ali, David S. Smith, Fabienne Pennec, Hideaki Matsubara, Julie Bourret, Kodai Otsu, Nicolas Tessier-Doyen, Pierre Elser, Urs T. Gonzenbach
Molten selenium, silver, cadmium, and tin were used to prepare a-Se, and a-Se98M2 (M = Ag, Cd, and Sn) alloys in order to determine the thermo-physical properties of these materials using the transient plane source technique. In order for these alloys to be used in industrial applications such as phase change optical storage, photo electrochemical solar cells, and holographic recording systems, among others, their thermal transport properties needed to be ...
Author(s): A. Sharma, K. Singh, N. Mehta
Four electrically conductive polymers were tested for their thermal transport properties to better understand their degradation mechanism with temperature. The samples that were tested were polyaniline polymers doped with varying amounts of nickel and aluminum. It was found that the thermal conductivities increased as the aluminum:nickel ratio increased, and that the thermal conductivity and thermal diffusivity of the samples increased with temperature until they reached a maximum value, and ...
Author(s): G. P. Joshi, N. S. Saxena, S. C. K. Mishra, T. P. Sharma, V. Dixit
Disodium hydrogenphosphate dodecahydrate was investigated for its thermophysical properties and the effects that temperature had on these properties. The goal of this work was to determine if this material was a suitable phase change material for use in supercooled thermal energy storage. It was found that this hydrate could efficiently exchange energy between itself and heat sources, it could reduce heat loss from energy storage systems, and it could store ...
Author(s): Masaaki Oya, Masakazu Yamazaki, Satoshi Hirano, Takeo S. Saitoh
Coal fly ash was used as the base material for the formation of thermal insulation materials. The porosity of the produced materials ranged from 86.3-94.5 vol. %. The insulating materials were prepared by ball milling, followed by foaming assisted by the addition of K12, casting and drying, and finally sintering. No harmful chemicals were released to the environment during their preparation. It was found that the thermal conductivity of the samples ...
Author(s): Heping Zhang, Junjie Feng, Lunlun Gong, Ruifang Zhang, Xudong Cheng, Ye Li
