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Journal Articles

Experimental study on secondary droplets produced during liquid jet impingement onto a horizon solid surface

Zhan, Y.*; Kuwata, Yusuke*; Okawa, Tomio*; Aoyagi, Mitsuhiro; Takata, Takashi

Experimental Thermal and Fluid Science, 120, p.110249_1 - 110249_12, 2021/01

Journal Articles

Effects of surface tension and viscosity on liquid jet breakup

Zhan, Y.*; Kuwata, Yusuke*; Maruyama, Kiyotaka*; Okawa, Tomio*; Enoki, Koji*; Aoyagi, Mitsuhiro; Takata, Takashi

Experimental Thermal and Fluid Science, 112, p.109953_1 - 109953_8, 2020/04

 Times Cited Count:2 Percentile:28.21(Thermodynamics)

Journal Articles

Droplet generation during liquid jet impingement onto a horizontal plate

Zhan, Y.*; Oya, Naoki*; Enoki, Koji*; Okawa, Tomio*; Aoyagi, Mitsuhiro; Takata, Takashi

Experimental Thermal and Fluid Science, 98, p.86 - 94, 2018/11

 Times Cited Count:4 Percentile:57.44(Thermodynamics)

Journal Articles

Cavitation erosion induced by proton beam bombarding mercury target for high-power spallation neutron sources

Futakawa, Masatoshi; Naoe, Takashi; Kogawa, Hiroyuki; Haga, Katsuhiro; Okita, Kohei*

Experimental Thermal and Fluid Science, 57, p.365 - 370, 2014/09


 Times Cited Count:8 Percentile:47.99(Thermodynamics)

A liquid mercury target system for a megawatt-class spallation neutron source is being developed in the world. Proton beam is injected to the mercury target to induce spallation reaction. The moment the proton beams bombard the target, pressure waves are generated in the mercury by the thermally shocked heat deposition. The pressure waves excite the mercury target vessel and negative pressure that may cause cavitation along the vessel wall. Gas-bubbles will be injected into the flowing mercury to mitigate the pressure waves and suppress the cavitation inception. The injected gas-bubbles conditions were examined and the effects were predicted experimentally and theoretically from the viewpoints of macroscopic time-scale and microscopic time-scale, i.e. in the former is dominant the interaction between the structural vibration and the pressure in mercury, and in the later is essential the pressure wave propagation process.

Journal Articles

Measurement of non-condensable gas in a PWR small-break LOCA simulation test with LSTF for OECD/NEA ROSA project and RELAP5 post-test analysis

Takeda, Takeshi; Owada, Akihiko; Nakamura, Hideo

Experimental Thermal and Fluid Science, 51, p.112 - 121, 2013/11

 Times Cited Count:10 Percentile:45.92(Thermodynamics)

Journal Articles

An Experimental investigation on self-leveling behavior of debris beds using gas-injection

Cheng, S.; Yamano, Hidemasa; Suzuki, Toru; Tobita, Yoshiharu; Gondai, Yoji*; Nakamura, Yuya*; Zhang, B.*; Matsumoto, Tatsuya*; Morita, Koji*

Experimental Thermal and Fluid Science, 48, p.110 - 121, 2013/07

 Times Cited Count:13 Percentile:38.22(Thermodynamics)

Journal Articles

Optically observation of mercury cavitation bubble collapsing

Naoe, Takashi; Futakawa, Masatoshi

Experimental Thermal and Fluid Science, 44, p.550 - 555, 2013/01

 Times Cited Count:2 Percentile:82.46(Thermodynamics)

The visualization of growth and collapse behavior for mercury cavitation bubble in contact with the solid wall was systematically carried out using precisely controlled pressure pulse and high-speed video cameras in order to understand the cavitation bubble behavior in mercury. It was confirmed through the measured time histories of pressure, vibrational acceleration, visualized images of bubble growth and collapse behavior that the acoustic emission was induced by the bubble collapsing which brings about the microjets and the shock waves. The annulate mist band expanding phenomenon caused by the shock wave propagation was visually recognized.

Journal Articles

Dynamic responses of a solid wall in contact with a bubbly liquid excited by thermal shock loading

Futakawa, Masatoshi; Naoe, Takashi

Experimental Thermal and Fluid Science, 35(6), p.1177 - 1183, 2011/09

 Times Cited Count:3 Percentile:72.25(Thermodynamics)

It is proposed that microbubbles are injected into the liquid metal to mitigate the impulsive pressure waves of spallation neutron target by means of absorption and attenuation effects. These effects are dependent on the relationship between bubble size and the rate of pressure increase. In the present experiment, a very rapid rise in pressure in the order of MPa/$$mu$$s, equivalent to the rise in pressure due to proton beam injection, was simulated by the electric discharge method in bubbly water to investigate the impulsive pressure mitigation effect of injected microbubbles. The solid wall response was measured using an accelerometer, and the dynamic responses of microbubbles were observed using an ultra-high-speed camera filming at $$5 times 10^5$$ frame/sec. It was confirmed from the experimental results that microbubbles are effective in reducing impulsive pressure waves and to suppressing the impact vibration of the solid wall in contact with the liquid.

Journal Articles

Experimental investigation of bubbling in particle beds with high solid holdup

Cheng, S.*; Hirahara, Daisuke*; Tanaka, Yohei*; Gondai, Yoji*; Zhang, B.*; Matsumoto, Tatsuya*; Morita, Koji*; Fukuda, Kenji*; Yamano, Hidemasa; Suzuki, Toru; et al.

Experimental Thermal and Fluid Science, 35(2), p.405 - 415, 2011/02

 Times Cited Count:23 Percentile:22.24(Thermodynamics)

The current experiments were conducted under two dimensional (2D) and three dimensional (3D) conditions separately, in which water was used as liquid phase, and bubbles were generated by injecting nitrogen gas from the bottom of the viewing tank. Various particle-bed parameters were varied, including particle-bed height (from 30 mm to 200 mm), particle diameter (from 0.4 mm to 6 mm) and particle type (beads made of acrylic, glass, alumina and zirconia). Under these experimental conditions, three kinds of bubbling behavior were observed for the first time using digital image analysis methods that were further verified by quantitative detailed analysis of bubbling properties including surface bubbling frequency and surface bubble size under both 2D and 3D conditions.

Journal Articles

Experimental results of heat transfer coefficients and friction factors in a 2D/3D rib-roughened annulus

Takase, Kazuyuki

Experimental Thermal and Fluid Science, 13(2), p.142 - 151, 1996/08

 Times Cited Count:7 Percentile:50.89(Thermodynamics)

no abstracts in English

Journal Articles

Thermal-hydraulic study on a double-flat-core high conversion light water reactor

Sugimoto, Jun; Iwamura, Takamichi; Okubo, Tsutomu; Murao, Yoshio

Experimental Thermal and Fluid Science, 4, p.354 - 361, 1991/00

 Times Cited Count:0 Percentile:100(Thermodynamics)

no abstracts in English

Journal Articles

Evaluation of heat conduction and visualization of heat flux in a plate making use of heat transfer experiments

Kunugi, Tomoaki; Akino, Norio; *; *

Experimental Thermal and Fluid Science, 4, p.448 - 451, 1991/00

 Times Cited Count:3 Percentile:64.63(Thermodynamics)

no abstracts in English

Journal Articles

Results of 0.5% cold-leg small-break LOCA experiments at ROSA-IV/LSTF; Effect of break orientation

; Kukita, Yutaka; Yonomoto, Taisuke; Koizumi, Yasuo; Tasaka, Kanji

Experimental Thermal and Fluid Science, 3, p.588 - 596, 1990/00

 Times Cited Count:18 Percentile:21.69(Thermodynamics)

no abstracts in English

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