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Theoretical Modeling and Inverse Analysis of Thermal Conductivity of Skeletons in SiO2 Nano-Insulation Materials

1
School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
2
Science and Technology on Space Physics Laboratory, Beijing 100076, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(7), 934; https://doi.org/10.3390/nano9070934
Received: 25 May 2019 / Revised: 7 June 2019 / Accepted: 8 June 2019 / Published: 28 June 2019
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Abstract

With the developments in high-performance nano-insulation material technology, theoretical studies on the heat transfer mechanisms in these materials have been conducted. However, the conductivity of nanometer-sized skeletons is still unclear. It is necessary to clarify the thermal conductivity of nanometer-sized solid skeletons in order to better understand the heat transfer mechanisms in nano-insulation materials. In the present study, a theoretical model for the thermal conductivity of nanometer-sized skeletons in nano-insulation materials is presented based upon the meso-structure of the material and the equation of phonon transfer. The size effect in thermal conductivity of the nanometer-sized particles is studied numerically, and the thermal conductivity is theoretically obtained. At the same time, a reverse method is established for the thermal conductivity of nanometer-sized particles based on the method of particle swarm optimization (PSO). The skeleton thermal conductivity for a specific nano-insulation material with a density of 110 kg/m3 and porosity of 0.94 is identified based upon experimental data from literature. Comparison results show that the theoretical conductivity of nanometer-sized skeletons and the identified results give the values of 0.145 and 0.124 W/(m K), respectively, clearly revealing obvious an size effect in the thermal conductivity of nanometer-sized skeletons. View Full-Text
Keywords: nano-insulation materials; thermal conductivity; simulation; identification nano-insulation materials; thermal conductivity; simulation; identification
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Zhang, X.-C.; Xia, X.-L.; Li, D.-H.; Sun, C. Theoretical Modeling and Inverse Analysis of Thermal Conductivity of Skeletons in SiO2 Nano-Insulation Materials. Nanomaterials 2019, 9, 934.

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