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Tamai, Hidesada; Nagayoshi, Takuji; Katono, Kenichi; Ito, Takashi; Takase, Kazuyuki
Nihon Konsoryu Gakkai Nenkai Koenkai 2009 Koen Rombunshu, P. 2, 2009/08
The characteristics of carryover from free-surface in a natural-circulation BWR are an important subject to be resolved for economic and safe design of the reactor. In this study, droplet quality of the carryover in a test section with 0.12 m in diameter was measured using throttling calorimeter with pressure ranging from 1.5-2.5 MPa. The measured droplet quality increases with decrease in distance from free-surface and with increase in vapor volumetric flux, and these trends are similar to those of previous data.
Yada, Hiroki; Kurachi, Hiroaki*; Suzuki, Katsuaki*; Tsukimori, Kazuyuki; Hattori, Shuji*
no journal, ,
Research on cavitation erosion in liquid metal is very important to confirm the safety of fast breeder reactor using sodium coolant and to understand cavitation erosion of spallation in the liquid-mercury target of a neutron source. At the erosion test on vibration cavitation in water and in lead-bismuth, erosion rate in lead-bismuth is ten times as fast as in water. In this study, the flowing system apparatus was developed for cavitation inception test using an orifice in liquid metal. The cavitation inception tests were carried out in liquid metal of lead-bismuth and deionized water. We discussed parameters of cavitation inception. Cavitation inception is not dependent on flow velocity both in deionized water and in lead-bismuth. And incipient cavitation number is between 0.8 and 0.6.
Ito, Kei; Ohshima, Hiroyuki; Kunugi, Tomoaki*
no journal, ,
For the purpose of direct simulations of gas entrainment (GE) phenomenon in fast reactors, we are developing a high-precision simulation algorithms for gas-liquid two-phase flows on unstructured meshes. In this study, unstructured adaptive mesh technique for gas-liquid two-phase flows is developed to reproduce local instant behaviors of interfacial dynamics. To achieve physically appropriate simulations, the volume and momentum conservative formulations are derived. The developed unstructured adaptive mesh technique is validated by simulating the slotted-disk rotation and dam-break problems. As a result, it is confirmed that the interfacial dynamic behaviors are well reproduced on the unstructured adaptive mesh.