Abstract
When a low temperature fluid flows into the bottom of a tank filled with a high temperature fluid, thermal stratification occurs because of differences in density. After a scram of a fast breeder reactor, the outlet temperature of the reactor coolant falls quickly, and a thermal interface appears in the hot plenum. Oscillation of the interface was observed in thermal-hydraulic tests with water as a simulant coolant. The characteristics of the oscillation were examined, and an analytical model was proposed which explained the mechanism of the oscillation growth. The low density fluid was entrained by the high density fluid flow and was sucked down periodically. The buoyant force of the sucked fluid supplied energy to the oscillation. The analytical results for the range of oscillation growth agreed well with the experiment.
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