纳米隔热材料导热特性研究

Characteristic of heat conduction in nano-insulation material

为进一步深入研究气凝胶纳米隔热材料的导热性能,在考虑气凝胶固体纳米颗粒尺寸非均匀分布的基础上,建立了SiO2气凝胶气固耦合导热计算模型。纳米颗粒的导热系数采用格子波尔兹曼法数值模拟。基于建立的结构模型,研究分析了密度、孔隙率及颗粒尺寸非均匀分布等因素对气凝胶气固耦合导热特性的影响。

In order to further investigate the heat conduction performance of aerogel nano-insulation material, this paper propose calculational model for solid and gas combined conduction in which the non-uniformity distri- bution of solid nanograin was taken into account. The thermal conductivity of aerogel nanograin was simulated using Lattice Boltzmann method. Based on the proposed structure model, the effects of density, side of struc- ture and non-uniformity distribution of solid nanograin on the coupled thermal performance of aerogel were in- vestigated.