Top>Research and Development>Development of the three-dimensional visualization method for a jet in liquid-liquid system
Development of three-dimensional visualization 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, wall-impingement makes it widely spread. However, to predictively investigate such behavior, conventional visualization methods can only visualize its front side. That's like what you can only see water surface when you take a bubble bath, and refraction of light at interface, which is a boundary surface between a jet and its surroundings, is a major factor.
In this study, to solve this problem, we developed a three-dimensional visualization method for a jet in liquid-liquid system. It is a new method to visualize molten fuels and their surroundings simulated by two fluids, water mixture and oil, using the combination of index-matching method, which matches the indices of two fluids, and 3D-LIF method, which makes a fluid fluoresce. Using this method makes us obtain the three-dimensional interfacial data of a jet and observe the jet in detail. We then clarified the behavior that the jet spreads thinly on the wall and its part forms droplets. Furthermore, by comparing the experimental results with numerical simulation results using the TPFIT, we confirmed that the wall-impinging jets can be roughly predicted on numerical simulation. Therefore, we built a technology base to experimentally obtain three-dimensional interfacial shape data. This outcome is due to research collaboration with University of Tsukuba.
In this study, to solve this problem, we developed a three-dimensional visualization method for a jet in liquid-liquid system. It is a new method to visualize molten fuels and their surroundings simulated by two fluids, water mixture and oil, using the combination of index-matching method, which matches the indices of two fluids, and 3D-LIF method, which makes a fluid fluoresce. Using this method makes us obtain the three-dimensional interfacial data of a jet and observe the jet in detail. We then clarified the behavior that the jet spreads thinly on the wall and its part forms droplets. Furthermore, by comparing the experimental results with numerical simulation results using the TPFIT, we confirmed that the wall-impinging jets can be roughly predicted on numerical simulation. Therefore, we built a technology base to experimentally obtain three-dimensional interfacial shape data. This outcome is due to research collaboration with University of Tsukuba.
A jet visualized three-dimensionaly and its cross-section (Experiment)
reference:Fumihito Kimura, Sota Yamamura, Kota Fujiwara, Hiroyuki Yoshida, Shimpei Saito, Akiko Kaneko, & Yutaka Abe (2022) Time-resolved 3D visualization of liquid jet breakup and impingement behavior in a shallow liquid pool, Nuclear Engineering and Design 389, 111660 Sota Yamamura, Kota Fujiwara, Kota Honda, Hiroyuki Yoshida, Naoki Horiguchi, Akiko Kaneko, & Yutaka Abe (2022) Experimental study of liquid spreading and atomization due to jet impingement in liquid–liquid systems, Physics of Fluids 34, 082110. Naoki Horiguchi, Hiroyuki Yoshida, Akiko Kaneno & Yutaka Abe (2023) Atomization mechanisms of a wall-impinging jet in a shallow pool, Physics of Fluids 35, 073309