Top>Research and Development>Development of the three-dimensional image-based measurement method for a jet in liquid-liquid system

For the severe accident management of nuclear reactors, predicting the behavior of molten fuels is important. In the case that the jet of molten fuels falls and atomizes, wall-impingement makes atomization behavior change and its prediction more difficult. The Thermal Hydraulics Team succeeded in three-dimensional visualizing the behavior of jets simulating molten fuels. However, to predict it quantitatively, it is necessary not only to visualize it but also to measure and analyze it.
In this study, to solve this subject, we developed a method to measure the feature quantities of a wall-impinging jet from three-dimensional interfacial data. Using this method makes us measure jet spreading area and droplet diameter and velocity and analyze them on the basis of flow structure. Furthermore, we confirmed that the method can be applied to three-dimensional interfacial data provided by numerical simulation. Therefore, we built a technology base to measure the feature quantities of a jet from three-dimensional interfacial data.
This outcome is due to research collaboration with University of Tsukuba.

The liquid film model of a wall-impinging jet (Horiguchi, et al., 2025)

The behavior of each liquid film part (Horiguchi, et al., 2025)

Droplets formed from each liquid film part and their tracks (Horiguchi, et al., 2022)

reference:Naoki Horiguchi, Hiroyuki Yoshida, Akiko Kaneko & Yutaka Abe (2022) Measurement of fragments of a wall–impinging liquid jet in a shallow pool, in Proceedings of 12th Japan- Korea Symposium on Nuclear Thermal Hydraulics and Safety, Miyazaki, Japan, 30 October–2 November 2022, Paper No. N12P1074
Naoki Horiguchi, Hiroyuki Yoshida, Akiko Kaneno & Yutaka Abe (2025) Atomization mechanisms in the vortex-like flow of a wall-impinging jet in a shallow pool, Physics of Fluids 37, 033333