In measurement of an ultrasonic flowmeter, the flow rate in piping is obtained using some measurement signals along the “chord” of the circular cross section of the piping. As for the “Chordal type ultrasonic flowmeter”, the flow rate is obtained by four (or eight) “chords”. The wall roughness influences the velocity profile. To evaluate the influences of roughness change on the measurement using four velocity points, a water test was performed. The Reynolds (Re) number of the test ranges from 4×105 to 3×106. It was suggested that high precision measurement in the range of high Re number can be expected in the smooth pipe. In the wall where sand of 0.1mm diameter was pasted, no difference in the velocity profile with the smooth wall was observed. A change in the velocity profiles appeared in the rough surface pipe where sands of 0.6mm and 0.2mm diameter has been pasted. Bias error (ESL) was used to estimate the uncertainty of the flow rate measurements using four velocity points. The difference of each ESL value based on the influence of roughness tended to diminish as the Re number increased. And the Re number dependency of ESL is small, especially in the high Re number side. It suggests that an actual flow rate test for the high Re number to confirm the influence of roughness would not be necessary.
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17th International Conference on Nuclear Engineering
July 12–16, 2009
Brussels, Belgium
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4353-6
PROCEEDINGS PAPER
Experimental Study of the Influence of Roughness Change in a Piping on the Flow Measurement Available to Purchase
Yoshihisa Nishi,
Yoshihisa Nishi
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
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Yuzuru Eguchi,
Yuzuru Eguchi
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
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Takashi Nishihara,
Takashi Nishihara
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
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Izumi Kinoshita,
Izumi Kinoshita
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
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Fumio Inada,
Fumio Inada
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
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Kazufumi Nagashima
Kazufumi Nagashima
The KANSAI Electric Power Co., Inc., Mihama, Fukui, Japan
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Yoshihisa Nishi
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
Yuzuru Eguchi
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
Takashi Nishihara
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
Izumi Kinoshita
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
Fumio Inada
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
Kazufumi Nagashima
The KANSAI Electric Power Co., Inc., Mihama, Fukui, Japan
Paper No:
ICONE17-75144, pp. 157-165; 9 pages
Published Online:
February 25, 2010
Citation
Nishi, Y, Eguchi, Y, Nishihara, T, Kinoshita, I, Inada, F, & Nagashima, K. "Experimental Study of the Influence of Roughness Change in a Piping on the Flow Measurement." Proceedings of the 17th International Conference on Nuclear Engineering. Volume 3: Thermal Hydraulics; Current Advanced Reactors: Plant Design, Construction, Workforce and Public Acceptance. Brussels, Belgium. July 12–16, 2009. pp. 157-165. ASME. https://doi.org/10.1115/ICONE17-75144
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