## NUMERICAL MODEL TO DETERMINE RADIATIVE PROPERTIES OF REPRESENTATIVE OPEN CELL FOAM STRUCTURE
## 摘要The accuracy of high temperature heat transfer model based on homogeneous media approach depends on the values of radiative properties, e.g. extinction coefficient (β), scattering albedo (ω) and scattering coefficient (Φ), used in the radiative transfer equation (RTE). In the present work, a numerical model is developed for determining the radiative properties of a tetrakaidecahedra unit cell structure. The information of solid and fluid control volumes are stored using Cartesian-coordinate based blocked-off region approach. The 3-D RTE is solved using the finite volume method to determine the unit cell reflectance and transmittance. The obtained values of reflectance and transmittance are then used in the recurrence relationships to calculate effective reflectance and transmittance of layers of unit cell structures. An inverse method based on genetic algorithm is developed to predict radiative properties of the equivalent homogeneous media. The effect of solid reflectivity and pore density on radiative properties of the porous media are investigated. It is observed that with increase in solid reflectivity, β decreases whereas ω increases. Increasing trend of β is found with pore density whereas ω is found to be independent of pore density. The radiative properties of tetrakaidecahedra structure are further compared with cubic cell structure and it is found that the radiative properties of former structure are strong function of solid reflectivity than the later structure. |

主页 | 旧刊 | 有关人员 | 未来大会 | American Society of Thermal and Fluids Engineering |