Abstract

Measurements of sound pressure level and frequency analysis were carried out for the control of oscillation noise due to the condensation of vapor injected from submerged various orifices into subcooled water. The phenomena were observed by means of shadowgraphy using a still camera. Peak frequency and amount of the oscillaoion noise caused by the condensation of vapor were dependent on subcooling and shapes of injecting orifice. The effect of bulk temperature in a water tank and difference among a single-orifice, a multi-orifice, a prous-disc-orifice and the other orifice were discussed and good predictive results for the visualization in a quiescent subcooled water envirnoment.

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