A Correction method based on probability density function and measurement volume for turbulence intensity profile measured by LDV in turbulent pipe flow

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.

Analysis technology of nuclear fusion materials by XPS

Yagyu, Junichi; Goto, Yoshitaka*; Arai, Takashi; Miya, Naoyuki; Morimoto, Yasutomi*; Okuno, Kenji*; Oya, Yasuhisa*; Hirohata, Yuko*; Tanabe, Tetsuo*

Heisei-15-Nendo Kiki, Bunseki Gijutsu Kenkyukai Hokoku, p.105 - 108, 2003/00

no abstracts in English

Nuclear shapes in complex fission phenomena

Poenaru, D. N.; Greiner, W.*; Nagame, Yuichiro; Gherghescu, R. A.*

Journal of Nuclear and Radiochemical Sciences, 3(1), p.43 - 49, 2002/06

https://doi.org/10.14494/jnrs2000.3.43

no abstracts in English

Measurement of fluid density by float type variable area flow meter; In case of unknown flow rate condition

Akino, Norio

Nihon Kikai Gakkai Ryutai Kogaku Bumon Koenkai Koen Gaiyoshu (CD-ROM), 4 Pages, 2001/10

no abstracts in English

Excavation and preparation rock block sample for LABROCK

Uchida, Masahiro; Yoshino, Naoto

JNC TN8410 2001-015, 35 Pages, 2001/05

JNC-TN8410-2001-015.pdf:1.73MB

This technical report summarizes excavation and preparation of the natural rock block sample used in LABROCK. This report was originally compiled by PNC in March, 1993.

Measurement of U and Pu concentration by X-ray fluorescence spectrometry using vertical irradiation system.

; ; ; Ikeda, Hisashi ; Jitsukata, Shu*; *

JNC TN8410 2000-022, 55 Pages, 2000/05

JNC-TN8410-2000-022.pdf:1.57MB

Measurement of U and Pu concentrations by wavelength dispersion type X-ray fluorescence spectrometry was studied. Sample holder was installed inside of glove box and other instruments, X-ray tube, monochromator and detectors were set out side of the glove box. X-rays was irradiated to sample though Be window. Fluorescent X-rays form sample were also passing though the same Be window and detected outside. Analytical conditions were optimized as follows. Sample thickness is 8 mm, which is 3ml of sample volume by the sample holder. Voltage and eurrent for X-ray tube is 50kV and 40 mA, respectively. Measurement was done twice, 60 seconds each, and averaged X-ray intensity was used to calculate elemental concentrations. Matrix correction was necessary to measure U and Pu concentration within 10% accuracy. Detection limits were calculated to 0.4 mg/L for U and 0.7mg/L for Pu. Calibration curve was liner up to 9 g/L fbr U and Pu. Two calculation methods, calibration curve method and standard addition method, were studied to measure Pu concentration in organic solution. Detection limit was 5.3 mg/L and 0.2 mg/L, respectively.

None

*; *

JNC TJ7400 2000-001, 79 Pages, 2000/02

JNC-TJ7400-2000-001.pdf:3.07MB

no abstracts in English

Determination of boron in Japanese geochemical reference samples by neutron-induced prompt -ray analysis

Yonezawa, Chushiro; P.P.Ruska*; Matsue, Hideaki; Magara, Masaaki; Adachi, Takeo

Journal of Radioanalytical and Nuclear Chemistry, 239(3), p.571 - 575, 1999/00

https://doi.org/10.1007/BF02349071

no abstracts in English

Design of correction coil for ITER

Kubo, Hiroatsu*; Omine, T.*; Yoshida, Kiyoshi

JAERI-Tech 98-050, 69 Pages, 1998/11

JAERI-Tech-98-050.pdf:1.88MB

no abstracts in English

Reduction of statistic error in Mihalczo subcriticality measurement

Hazama, Taira

PNC TN9410 98-073, 48 Pages, 1998/08

PNC-TN9410-98-073.pdf:1.36MB

The theoretical formula for the statistical error estimation in Mihalczo method was derived, and the dependence of the error were investigated on the facility to be measured and on the parameter in the data analysis. The formula was derived based on the reactor noise theory and the error theory for the frequency analysis, and found that the error depends on such parameters as the prompt neutron decay constant, detector efficiencies, and the frequency bandwidth. Statistical errors estimated with the formula was compared with experimental values and verified to be reasonable. Through parameter surveys, it is found that there is a setting in the data analysis to optimize the magnitude and reliability of the errors. In the experiment performed in DCA subcriticality measurement facility, it is estimated experimentally that the measurement requires 20 minutes to obtain the statistic error of 1% for the keff 0.9. According to the error theory, this should be reduced to 3sec in the aqueous fuel system typical in fuel reprocessing plant.