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Abstract: This study aims to understand the thermal conductivity of nanoscale porous material. Macroscale simulations of thermal conductivity were revised to predict the thermal conductivity of nanoscale porous material. Using the thermal constants analyzer, two packed beds of nanoscale nickel particles and a single packed bed of microscale nickel particles were measured for their effective thermal conductivities. Results concluded the thermal conductivity of the solid particles was higher than the thermal conductivity of the nano/microscale media. Based on predictive models, a revised combined parallel-series model, as well as a revised Hsu-Cheng model, were capable of accurately predicting the effective thermal conductivities of micro/nanoscale packed beds.

Reference: Science China Technological Sciences, 55, (2012) pp 2140-2147

DOI: 10.1007/s11431-012-4865-y