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Masaki, Naoto*; Kaneko, Akiko*; Horiguchi, Naoki; Yoshida, Hiroyuki
Extended Abstracts for the 11th JSME-KSME Thermal and Fluid Engineering Conference (J-K TFEC11) (Internet), 6 Pages, 2025/10
In the event of a core meltdown in a nuclear reactor, molten fuel has a possibility to enter a coolant pool in a jet-like manner. Jet atomization promoting heat transfer between molten fuel and coolant is crucial for severe accident management. Previous studies of jet atomization have focused on interfacial shear stress acting on a jet because it contributes to the growth and deformation of interfacial waves and ultimately promote droplet formation. However, it is extremely difficult to observe interfacial wave evolution on a cylindrical jet and quantify interfacial shear stress acting on an interface. Then, the effect of interfacial shear stress acting on a jet is not fully clarified. This study aims to experimentally clarify the effect of interfacial shear stress on jet atomization. We conducted experiments in a liquid-liquid system using the 3D-LIF method and PIV. Herein, a glycerol-water solution was used as a jet phase and silicone oil as a continuous phase to match their refractive indices. A jet entered vertically downward through a 3 mm nozzle into a pool. The injection velocity was 2.6 m/s, and the pool depth was 30 mm. To use the 3D-LIF method and PIV with refractive index matching, Rhodamine 6G and tracer particles were used. As a result, waves on a jet interface were observed to have two modes. The larger waves appeared in a two-dimensional (axisymmetric) form at the interface more than 15 mm away from the nozzle, and three-dimensional smaller waves (wavelength 
= 1 mm) were found to form on the surface of these larger waves. Furthermore, the interfacial shear stress acting on the smaller waves was found to be greater than that acting on the larger waves. Droplets were also observed to form easily from the smaller waves. From these results, we experimentally concluded that high interfacial shear stress acting on small waves promotes droplet formation.
Zhang, H.*; Umehara, Yutaro*; Yoshida, Hiroyuki; Mori, Shoji*
International Journal of Heat and Mass Transfer, 218, p.124750_1 - 124750_11, 2024/01
Times Cited Count：15 Percentile：79.71(Thermodynamics); Tsuji, Yoshiyuki*; ; Nakamura, Hideo; ; Kukita, Yutaka
Nihon Genshiryoku Gakkai-Shi, 39(8), p.669 - 680, 1997/00
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)no abstracts in English
JAERI-M 85-219, 19 Pages, 1986/01
no abstracts in English
