研究目的
To model the inner structures of skeleton of porous ceramic foam using three-dimensional periodic ordered opal structures and predict their spectral radiative properties using the FDTD method for further analysis of radiative transfer.
研究成果
The three-dimensional periodic ordered opal structures effectively model the inner skeleton of porous ceramic foam, showing strong spectral selectivity in radiative properties with red shift as sphere size increases. Absorption peaks occur where size parameters are near 1, and BSDF and radiation intensity distributions transition from uniform to anisotropic with increasing wavelength. This work provides a foundation for further research on radiative transfer in ceramic foams across different scales.
研究不足
The study simplifies the complex inner structures of ceramic foam skeletons to periodic opal structures, which may not fully capture real-world irregularities. Computational resources limit the mesh size and number of cells used in simulations. The analysis is focused on alumina material and specific size ranges, potentially limiting generalizability to other materials or scales.
1：Experimental Design and Method Selection:
The study uses three-dimensional periodic ordered opal structures to model the inner skeleton of porous ceramic foam, based on SEM scanning images. The FDTD method is applied to solve Maxwell's equations for predicting spectral radiative properties, including reflectivity, transmissivity, absorptivity, BSDF, and radiation intensity distributions.
2：Sample Selection and Data Sources:
The models are derived from SEM scanning pictures of ceramic foam skeletons, with sphere radii ranging from
3：7 μm to 7 μm. Optical properties of alumina are taken from reference [20]. List of Experimental Equipment and Materials:
SEM for imaging, computational domain with PML and periodic boundary conditions, and alumina material for spheres.
4：Experimental Procedures and Operational Workflow:
Models are created with hexagonal close-packed spheres; FDTD simulations are run for incident wavelengths from 0.76 μm to 4 μm with non-polarized light; radiative parameters are calculated using power flux and far-field transformations.
5：76 μm to 4 μm with non-polarized light; radiative parameters are calculated using power flux and far-field transformations. Data Analysis Methods:
5. Data Analysis Methods: Spectral data are analyzed for features like red shift and absorption peaks; BSDF and intensity distributions are compared using normalization and cross-sectional analysis.
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