Measurement of Two-Phase Flow Using Multi-Wave Ultrasonic:(Liquid and Gas Velocity Measurement and Phase-Separation Technique Using Ultrasonic Time-Domain Cross-Correlation Method)

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This paper proposes a new measurement technique for multi-phase flow using correlation and multi-wave method. The authors developed a unique ultrasonic transducer named as multi-wave TDX. The TDX consists of a special ultrasonic element having two basic ultrasonic frequencies. The central 3 mm diameter area has a basic frequency of 8 MHz and the outer area has a basic frequency of 2 MHz. The TDX can emit the two ultrasonic frequencies independently. Using the two ultrasonic wave lengths, signals of two basic frequencies can be obtained at the same time. Comparing with the each echo signal, the signal combination can be classified into 3 groups. Hence, applying ultrasonic correlation method (UTDC) and the signal comparison method for multi-wave method, bubble rising velocity and liquid velocity distribution can be obtained simultaneously.
日本混相流学会の論文