Mathematical model of impurities hide out and return in nuclear power plant steam generator

This paper discusses a simple mathematical-physical model for describing the dissolved impurities hide out and return phenomenon in the boiling channel, within the viscous sub layer. By solving the equation of convection-diffusion for the liquid phase near the heating surface and the bulk stream, the effect of heat flux in distribution of impurities is considered. With deriving the impurities mass balance based on the presented model and using the impurities mass balance in the viscous sub layer as the boundary conditions, the derived differential equations are solved by the finite volume (upwind) method.