Abstract
The influence of buoyancy on pressure oscillation amplitude and frequency was studied with two steam jet directions in the range of steam mass flux 8.34–50.13 kg/(m2·s) and water temperature 40–85 °C. At small steam mass flux, the steam bubble pattern of vertical downward jet is attached bubble regime because the direction of steam momentum and buoyancy are opposite. The pressure oscillation frequency is less than 20 Hz, and the pressure oscillation amplitude is less than 1 kPa, which is much smaller than that for a vertical upward jet. It is conducive to the safety of relevant equipment. For the rough grown detached bubble regime, due to the influence of buoyancy, on the pressure oscillation frequency of vertical downward jet is smaller than that of vertical upward jet. Two dimensionless correlations of the pressure oscillation frequency were presented considering the influence of buoyancy. The prediction errors are within ±11%.
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