Development of measurement technique for surface waves on high-speed liquid lithium jet for IFMIF target

Wave period of free-surface waves on high-speed liquid lithium jet for IFMIF target

“…However high-frequency small waves of more than 1000 Hz dominate the surface waves at 15 m/s as shown here. This result is consistent with our previous result [2,6], that dominant wavelength was approximately 4 mm and the dominant wave amplitude was approximately 0.4 mm even at the velocity of 15 m/s. At the velocities of 7 and 9 m/s, the peaks of the frequency distributions are broader and shifted to longer wave period regions.…”

“…As mentioned in Section 1, for random waves such as ocean waves, distributions of heights and periods are representatives of wave properties as well as frequency spectra. In our previous report [2], distribution of the wave heights of the Li jet shows a close agreement with the Rayleigh distribution Eq. (2).…”

“…Our previous study [2] indicates that distributions of wave heights on the Li jet show close agreement with the Rayleigh distribution which is applicable to height distribution of ocean waves. It was suggested that waves on the Li flow would have random properties as well as the ocean waves.…”

“…We showed that heights of surface waves on the Li jet gave close agreement with the Rayleigh distribution [2].…”

Free-Surface Characteristics of a Liquid Li Wall Jet

“…A contact-type liquid level sensor (a contact probe) detects contact signals between the probe and the Li surface, and the detected signals can be used to analyze the free-surface fluctuation characteristics statistically [9][10][11][12]. The obtained characteristics are the wave period, wavelength, and wave height (amplitude) of the free-surface fluctuations.…”