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Zhang, H.*; Umehara, Yutaro*; Horiguchi, Naoki; Yoshida, Hiroyuki; Eto, Atsuro*; Mori, Shoji*
Energy, 335, p.138090_1 - 138090_18, 2025/10
Nuclear power is a key low-carbon energy source for a carbon-neutral future. In boiling water reactors (BWRs), steam-water annular flow near fuel rods is crucial for reactor safety, but its high-temperature, high-pressure conditions (285
C, 7 MPa) make direct measurement challenges. To address this, we used an HFC134a-ethanol system at lower conditions (40C, 0.7 MPa) to simulate BWR annular flow. Using a high-speed camera and the constant electric current method, we analyzed liquid-film characteristics, wave velocity and frequency. We also examined surface tension and interfacial shear stress effects. Furthermore, we proposed a new correlation for base film thickness.
Abe, Yutaka; ; Murao, Yoshio
JAERI-M 90-215, 81 Pages, 1991/01
no abstracts in English
Journal of Nuclear Science and Technology, 24(10), p.811 - 820, 1987/10
Times Cited Count：4 Percentile：44.48(Nuclear Science & Technology)no abstracts in English
JAERI-M 85-219, 19 Pages, 1986/01
no abstracts in English
Osakabe, Masahiro; Koizumi, Yasuo; ; ; Tasaka, Kanji
Nucl.Eng.Des., 98, p.69 - 76, 1986/00
Times Cited Count：3 Percentile：40.55(Nuclear Science & Technology)no abstracts in English
Zhang, H.*; Umehara, Yutaro*; Mori, Shoji*; Horiguchi, Naoki; Yoshida, Hiroyuki
no journal, ,
Due to the operating conditions of BWRs (285C and 7 MPa), the direct visualization and detailed liquid film measurement of steam-water annular flow in BWRs have been highly challenging. This study addresses this limitation by developing a novel HFC134a-ethanol annular flow system at lower temperature and pressure (40C and 0.7 MPa), simulating the steam-water annular flow under BWR conditions. The experiments of HFC134a-ethanol upward annular flow were conducted in a 5 mm inner diameter tube using the constant electric current method, and we obtained the flow characteristics including base, average, and maximum film thickness and the height of disturbance wave.
