Abstract
A simple model of radiant heat transfer through the cover gas in a sodium-cooled fast reactor is presented. The cover gas medium is assumed to consist of a cloud of sodium droplets suspended in a transparent gas. The radiative properties of the droplet cloud—absorption and scattering efficiencies and scattering phase function—are calculated using the Mie theory of electromagnetic scattering with optical properties predicted by the classical electron theory of metals. Radiative transfer through the cover gas is calculated rigorously using the discrete ordinale method and compared with the results obtained by the isotropic scaling and Eddington approximations. Numerical results of the model are presented and used to estimate the effect of droplet scattering on heat transfer through the fast reactor cover gas.
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