抄録
Ultrasound-based flow measurement methods can be easily applied to many two-phase flows. Ultrasonic Velocity Profiler (UVP) is well established measurement technique based on Doppler frequency shift of ultrasound reflected by moving bubbles. In order to improve the degree of information obtained by UVP, the bubble separation algorithm has been developed. Separating bubble data allows easy comparison of results with other measurement methods (such as cameras) even in the time domain (not only time-averaged values). Also, separated data might be more useful for numerical codes validation. Finally, separating data allows to recognize measured bubbles from each other and track the trajectory of their reflecting interface. This allows to measure bubble diameters, average velocities. Separation was used for air bubbles rising in the water column and the velocity of bubbles in the radial direction was compared with results from high speed camera measurement.
