Pore scale simulation of spectral radiative properties of Voronoi open-cell carbon foams at high temperatures
| Autor: | Xue Chen, Xin-Lin Xia, Jian Qiu, You-Wei Yang, Jia-Qi Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Scattering Monte Carlo method chemistry.chemical_element 02 engineering and technology Molar absorptivity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Computational physics 010309 optics chemistry 0103 physical sciences Absorptance Radiative transfer Transmittance 0210 nano-technology Porosity Carbon |
| Zdroj: | Infrared Physics & Technology. 114:103655 |
| ISSN: | 1350-4495 |
| Popis: | A pore scale model was established to investigate the high-temperature radiative properties of carbon foams with high porosity. Voronoi Tessellation for the random structure of carbon foams and Monte Carlo ray-tracing method was employed to simulate the apparent radiative behaviors and volumetric radiative properties. By compared with the measured data at room temperature in Ref. (Celzard et al., 2012), the numerical model was verified to possess a high precision, which the maximum deviation are 1.8% for normal absorptance, 0.3% for normal-hemispherical transmittance and 1.5% for normal-hemispherical reflectance, respectively. It is also acceptable for the simulated results of volumetric radiative properties. Based on the spectral radiative properties of carbon basic material found in Ref. (Touloukian and DeWitt, 1972), the spectral radiative properties of carbon foam sheets at high temperature between 1183 K and 2073 K were predicted. It was found that absorptance is dominant in the apparent radiative behaviors of carbon foams at high temperatures with a wavelength of 0.665 μm. Then, the bidirectional reflectance distribution function was numerically investigated. The results showed a backward scattering of the reflected energy at the foam sheet surface and reflected energy peaks are always located at around respective incident angles. For volumetric radiative properties at high temperatures, extinction coefficient ranged between 200 m−1 and 450 m−1, which had been verified with relation formula in an error of less than 1%. In addition, scattering albedo and scattering phase function were not only simulated but also compared with the empirical formulas, to some extent, agreed well with them. |
| Databáze: | OpenAIRE |
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