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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL MODEL TO DETERMINE RADIATIVE PROPERTIES OF REPRESENTATIVE OPEN CELL FOAM STRUCTURE

Vipul M. Patel
Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India

Udayraj
Institute of Textile & Clothing

Abstract

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.

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