Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 29, 2018 - November 30, 2018
In order to measure void distribution in opaque two-phase flows such as liquid-metal, ultrasonic tomography was developed. In the tomography, the measurement accuracy depends on the number of sensors. However, with increases the number of sensors, the temporal resolution decreases for obtaining a cross-sectional information. Therefore, lower number of sensors is suitable for two-phase flow measurement. In order to reduce the number of sensors, a reflection method was employed for the tomography. An ultrasonic sensors which can emit ultrasonic wave at wide-angle was developed. It was shown that the sensor could emit ultrasonic wave in the angle ranging of ±55°. Furthermore, the sound pressure thickness was almost constant at 4~6 mm. As a result, it was confirmed that echo method could be applied for the tomography algorithm, and it enabled to reduce the number of ultrasonic sensors for the tomography.
