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Proceedings of the 8th International Symposium on Radiative Transfer RAD-16
June, 6-10, 2016, Cappadocia, Turkey

DOI: 10.1615/RAD-16


ISBN Print: 978-1-56700-458-8

ISSN Online: 2642-5629

ISSN Flash Drive: 2642-5661

COMBINED HEAT TRANSFER IN A DIRECTLY IRRADIATED OPTICALLY-LARGE HETEROGENEOUS SPHERICAL PARTICLE

pages 310-317
DOI: 10.1615/RAD-16.380
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ABSTRACT

The effects of intra-particle radiative heat transfer on the temperature profiles of a porous particle undergoing heating and cooling processes are investigated. Two particle compositions with differing porosity and optical properties are considered. Two processes are considered for each particle composition: heating under direct concentrated solar irradiation and passive cooling. A novel formulation of the boundary condition for a directly irradiated participating medium surrounded by a non-participating medium is presented for the P1 approximation. Transient temperature profiles from simulations utilizing the P1 approximation and the presented boundary condition are compared to profiles from simulations utilizing the Rosseland diffusion approximation for all cases considered.

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