We report on experiments on the effects of air bubbles on ultrasound velocity measurements in fluids. We used an acoustic Doppler velocimeter system for measuring the three velocity components in a single point and an acoustic Doppler velocimetry profiler system for measuring axial velocity in several points along the beam. The results suggest that both systems essentially measure the velocity of the bubbles, independent of the low air-volume concentration and of bubble radii in the flow field.
The Effects of Air Bubbles on Ultrasound Velocity Measurements / LONGO S.. - In: EXPERIMENTS IN FLUIDS. - ISSN 0723-4864. - 41:4(2006), pp. 593-602. [10.1007/s00348-006-0183-0]