To prevent the duct of exhaust from adhesion caused by solidifying droplets of molten salt and its vapor, a method to supply air along the duct wall from a slit on the back of an annular step is proposed. For the purpose to clarify the behavior of gas-liquid two phase flow and to provide fundamental data for the rational design of the duct, a numerical analysis of 3D turbulent swirling flow with solidifying droplets is carried out. The Lagrangian approach is employed for the motion of droplets, and the momentum, heat and mass transfer between the dispersed phase and carrier gas is taken into account. The velocity profiles of surroundings, the behavior of molten salt droplets and the diffusion of the vapor are calculated. Based on those results, the influences of swirling flow on the deviationof droplets from the wall and the dilution of the vapor are discussed.
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