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The Study and Analysis of Nano-porous Material Heat Transfer Properties

Author: ZhangHua
Tutor: HanYuGe
School: Nanjing University of Technology and Engineering
Course: Refrigeration and Cryogenic Engineering
Keywords: random structure aerogel lattice Boltzmann method effective thermalconductivity
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Type: Master's thesis
Year: 2014
Downloads: 23
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Abstract


Nano-porous composite material is the core part of new thermal protection system. It’s physical properties has great affect to the performance of thermal protection system. In order to develop more economy nano-porous materials and improve the insulation performance,we should study and understanding the effection of heat transfer mechanism to porous materials thermal performance as well as micro-structure. So the work of this paper has important guiding significance to improve the insulation performance of thermal protection system.Based on the SEM photos, we characterise the microstructure features of aerogel and fiber in composite material separately. Method based on process is used to construct three-dimensional porous structure randomly, while fiber three-dimensional numerical structure is constructed though self-write program. More over, we analysis the influence of different structural parameters on the three-dimensional numerical structure with some excemples.An analytical model is developed based on the three-dimensional numerical structure. The model has consider the effects of particle size, solid-gas coupling，contact length of particles. The results of thermal conductivity predicted by this analytical model agree well with the experiment data. Then the influence of structural parameters, density, pressure, temperature, gas atmosphere, etc. on the thermal conductivity can be analyzed.Aerogel numerical heat transfer model is developed based on the pore character. Based on the structure constructed before, thermal conductivity of aerogel and fiber under different structure parameters are calculated though lattice Boltzmann method. Compared to the experimental data, lattice Boltzmann method is verified applicable and accurate for the structure of nano-porous composite material.

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