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A measurement system using Doppler method of ultrasound pulses has been developed in order to clarify multi-dimensional flow characteristics of bubbly flows. The measurement system can measure an instantaneous velocity profile of mixture. Since the statistical process of the measured velocity profiles gives information of velocity profiles of both gas and liquid phases, a void fraction profile, turbulence intensity of liquid phase for bubbly flow in a channel, a liquid velocity profile around a bubble and so on. In this paper, the measurement system is discussed and typical results are introduced.

Ultrasound Pulse Doppler Technique for Flow Measurement in Bubbly Flows.