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Wada, Yuki; Furuichi, Noriyuki*; Tsuji, Yoshiyuki*
European Journal of Mechanics B, Fluids, 91, p.233 - 243, 2022/01
Times Cited Count：1 Percentile：21.05(Mechanics)Kondo, Hiroo*; Kanemura, Takuji*; Park, C. H.*; Oyaizu, Makoto*; Hirakawa, Yasushi; Furukawa, Tomohiro
Fusion Engineering and Design, 146(Part A), p.285 - 288, 2019/09
Times Cited Count：1 Percentile：11.15(Nuclear Science & Technology)Herein, the wall shear stress in a double contraction nozzle has been evaluated experimentally to produce a liquid lithium (Li) target as a beam target for intense fusion neutron sources such as the International Fusion Materials Irradiation Facility (IFMIF), the Advanced Fusion Neutron Source (A-FNS), and the DEMO Oriented Neutron Source (DONES). The boundary layer thickness and wall shear stress are essential physical parameters to understand erosion-corrosion by the high-speed liquid Li flow in the nozzle, which is the key component in producing a stable Li target. Therefore, these parameters were experimentally evaluated using an acrylic mock-up of the target assembly. The velocity distribution in the nozzle was measured by a laser-doppler velocimeter and the momentum thickness along the nozzle wall was calculated using an empirical prediction method. The resulting momentum thickness was used to estimate the variation of the wall shear stress along the nozzle wall. Consequently, the wall shear stress was at the maximum in the second convergent section in front of the nozzle exit.
Wada, Yuki; Furuichi, Noriyuki*; Kusano, Eisuke*; Tsuji, Yoshiyuki*
Proceedings of 15th International Conference on Flow Dynamics (ICFD 2018) (USB Flash Drive), p.778 - 779, 2018/11
Spatial resolution effect of LDV (Laser Doppler Velocimetry) on the time-averaged statistics is presented in high Reynolds number turbulent pipe flow. Employing PDF (Probability Density Function) of streamwise velocity, we report the study of overestimation of time-averaged statistics based on the size of measurement volume. We proposed a simple equation to estimate their spatial resolution effect. Using the proposed equation, the measurement position and the measurement volume calculated precisely based on experimental setup, it was found that the correction for spatial resolution effect is possible. Analyzing the pipe flow data measured by LDV, we estimated the expected turbulence intensity profile. The validity of the present correction method was confirmed by comparing the correction result based on the low-resolution experimental result with the high-resolution experimental result.
Otsu, Iwao; Kondo, Masaya; Yonomoto, Taisuke; Anoda, Yoshinari
Nihon Kikai Gakkai 2001-Nendo Nenji Taikai Koen Rombunshu, Vol.1, p.7 - 8, 2001/00
no abstracts in English
Miyake, Yasuhiro*; *; ; Kimura, Nobuyuki
JNC TN9400 2000-016, 40 Pages, 1999/12
JNC-TN9400-2000-016.pdf:3.71MB
ln the conventional visualization system for the computational results, only Japanese (Nihongo) Line Printer (NLP) was available to print two dimensional cross sectional plots of vector and scalar fields. To evaluate the phenomena, an analyst had to print many plots on the NLP. This task makes difficult to check the computational results immediately after the calculation. Recently, as the visualization tools, we introduced Micro AVS and Field View which are utilized widely in the scientific and the industrial fields. ln order to show the numerical results on the visualization software, we constructed a post processing system which convert the results of the numerical code to "lntermediate files" which can be read by the visualization tools. As using this system, the examination of the numerical results can be executed on the display of the personal computer. Furthermore, the persuasive report and paper with high quality can be produced due to the color printing. As for the transient calculation, the change of the phenomena can be visually evaluated by using the animation function.
Tokuhiro, Akira; Kimura, Nobuyuki;
JNC TN9400 2000-014, 86 Pages, 1999/06
JNC-TN9400-2000-014.pdf:11.72MB
Experiments were performed using the WAJECO facility to investigate the thermohydraulic mixing of multiple jets flowing out of a LMFBR core. Mixing is the root of the thermal striping problem. The multiple jets are typically at different velocities and temperatures and may induce thermal stresses upon components they impinge. In our study we modeled the mixing of three vertical jets, the central at a lower temperature than the two adjacent jets at equal temperatures. The jets are quasi-planar. The parameters were the average exit jet velocities (Uo,av) and the temperature difference between the "cold" and "hot" jets (
Thc=Thot-Tcold). Measurements of the liquid velocity, initially using laser Doppler velocimetry (LDV) and later ultrasound Doppler velocimetry (UDV), for both our reference single-jet and the triple-jet configuration, comprised Phase I of the experiments (up to 1994). Two reports (TN9410 96-181 and TN9410 96-296; in Japanese) reported on the hydraulic and heat tra
*; *; Akiyama, Mamoru*; Fumizawa, Motoo
Nihon Kikai Gakkai Rombunshu, B, 60(569), p.113 - 118, 1994/01
no abstracts in English
Fumizawa, Motoo
Nihon Kikai Gakkai Rombunshu, B, 59(567), p.3686 - 3693, 1993/11
no abstracts in English
*; Fumizawa, Motoo
Kashika Joho Gakkai-Shi, 13(SUPPL.1), p.265 - 268, 1993/07
no abstracts in English
*; *; Akiyama, Mamoru*; Fumizawa, Motoo
Proc. of the 2nd ASME/JSME Nuclear Engineering, p.151 - 156, 1993/00
no abstracts in English
Okamoto, Kaoru*; Makino, Yasushi*; Ono, Ayako; Yoshida, Hiroyuki
no journal, ,
JAEA has developed an advanced neutronics/thermal-hydraulics coupling simulation system, in which detailed two-phase flow simulation code (TPFIT or JUPITER) is applied to part of thermal-hydraulics. Those detailed codes can predict small-scale thermal-hydraulics behavior inside sub-channels of a fuel bundle, so that measurement data with high-resolutions in time and space are required to achieve the appropriate validation of the codes. In this study, Laser Doppler Velocimetry (LDV) is applied for measurements of velocity and void fraction in air-water dispersed bubbly flows. The LDV can obtain local measurement data without any disturbance to flow field. In particular, fluorescent particles are introduced for liquid velocity measurements in order to clearly distinguish recorded signals between gas and liquid phases. The measurement method and the results will be shown in this presentation.
Murata, Atsushi*; Saruta, Koichi; Wakui, Takashi; Li, Y.*; Futakawa, Masatoshi; Oshima, Ryota*; Furukawa, Hirohiko*
no journal, ,
Characteristics of sound field measurement using a laser Doppler vibrometer (LDV) have been investigated with the aim of evaluating the applicability of the optical measurement method of sound fields to a diagnostic technique for equipment abnormality in high radiation environments. Important aspects of sound measurement using a LDV are discussed based on its dependence on optical path length and sound frequency in terms of anomaly detection and diagnosis in terms of anomaly detection and diagnosis.
