Acoustic noise with sodium Boiling in a seven-pin bundle

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Kikuchi, Y.*; Daigo, Y.*; Haga, K.*

Kikuchi, Y.*; Daigo, Y.*; Haga, K.*

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This paper deals with the acoustic noises associated with sodium boiling in a seven-pin bundle, six central channels of which were blocked. The acoustic intensity first increased with rise in the heat flux, and after attaining a maximum, decreased somewhat to remain more or less constant thereafter. At the final upstream voiding which resulted in the dryout, however, the acoustic intensity increased sharply. The frequency spectrum did not change markedly during boiling. Distinct peaks observed in the high frequency range for all the measurements could well be related to the characteristics of the resonances of the experimental system which is not the waveguide, but the test section and/or the expansion tank. On the other hand, the peak observed at the low frequency was due to the repetition of bubble formation and collapse.