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《CIESC Journal》 2015-11
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Thermal conduction characteristic of nano-granule porous material using lattice-Boltzmann method

KAN Ankang;KANG Liyun;CAO Dan;WANG Chong;Merchant Marine College, Shanghai Maritime University;  
To study the thermal property of silica aerogel, a method is proposed for constructing three-dimensional mesoscopic physical model of nanoparticle porous materials, based on the random statistical theory. The spatial distribution of particles, particle size and porosity can be adjusted according to actual microscopic information of the porous material. D3Q15 LBM model is employed to perform numerical simulation and analysis in mesoscopic scale. And the influence of particle diameter, porosity and other factors on thermal conductivity of porous media is analyzed. That is, the thermal conductivity will decrease with the increase of particle size for constant porosity; the thermal conductivity falls and then rises as the porosity increases for constant particle size; the uniformity of particle size plays an important role on the thermal property. The simulation results are nearly the same with the experimental ones. The research will be an excellent reference for optimization of thermal performance and prediction of effective thermal conductivity for aerogels.
【Fund】: 上海市自然科学基金项目(15ZR1419900)~~
【CateGory Index】: O357.3
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