Abstract
The radiative properties of metal foam are determined by the complex multi-scale characteristics. The effects of microscopic morphology of ligament and porous parameter on the apparent and volumetric radiative properties are investigated by performing a trans-scale simulation, which are respectively presented by the absorptance and transmittance, the extinction coefficient and scattering albedo here. The spectral reflective property of ligament surface ranging from 0.5 ∼ 7 μm is firstly modeled with Finite Difference Time Domain (FDTD) method considering the micro-scale roughness, and then compared with other three simplified reflection models (specular, diffuse and harmonic reflection). With the reconstructed foam structure and Monte Carlo method simulation, the spectral radiative properties of different nickel foam slabs are repetitively calculated to analyze the effects of above two factors. The results show that three reflection models for the ligament surface all have a non-negligible deviation, and the maximum greater than 20% is found. Besides, micro-scale morphology of ligament significantly affects the absorptance, transmittance and scattering albedo of the nickel foam slab. By contrast, porous structural parameters have noticeable influence on the apparent properties and extinction coefficient, while negligible effect on the scattering albedo.
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