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通过改变壳核结构纳米颗粒半径比率和材料可改变纳米流体的光谱特性。本文采用Quasi-Static近似的Rayleigh散射方法,分析计算处于非独立散射状态下壳核结构纳米颗粒的消光效应,并采用波动电动力学方法计算了相应体积分数下纳米颗粒间的近场辐射传热。结果表明,壳核结构纳米颗粒消光系数与半径比、体积分数、粒子内外壳材料有关,近场辐射传热量与温度、间距、体积分数有关。比较辐射导热系数、近场辐射等效导热系数、有效导热系数可见,在颗粒均匀分布假设下,体积分数f_x>0.6%且距离波长比小于0.5时,采用波动电动力学的方法颗粒阵列间近场辐射作用可忽略。
The spectral properties of the nanofluids can be changed by changing the ratio of the nanoposidic radius of the putamen and the material. In this paper, the quasi-static Rayleigh scattering method is used to analyze the extinction effect of nanoparticle with shell-shell structure under non-independent scattering conditions. The wave-electrokinetics method is used to calculate the near-field radiative heat transfer between the nanoparticles under the corresponding volume fraction. The results show that the extinction coefficient of nanoparticle in the putamen is related to the radius ratio, the volume fraction and the shell material in the shell. The near-field radiative heat transfer is related to the temperature, the spacing and the volume fraction. Comparison of radiative thermal conductivity, near-field radiation equivalent thermal conductivity, effective thermal conductivity can be seen under the assumption of uniform particle distribution, the volume fraction f_x> 0.6% and the distance wavelength ratio is less than 0.5, the use of wave electrokinetics approach between the particle array near field Radiation can be ignored.