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https://hdl.handle.net/20.500.14094/90006822
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2024-04-20
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90006822 (fulltext)
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2.37 MB
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メタデータID
90006822
アクセス権
open access
出版タイプ
Accepted Manuscript
タイトル
Evaluation method of transit time difference for clamp-on ultrasonic flowmeters in two-phase flows
著者
Murakawa, Hideki ; Ichimura, Shuhei ; Sugimoto, Katsumi ; Asano, Hitoshi ; Umezawa, Shuichi ; Sugita, Katsuhiko
著者ID
A0958
研究者ID
1000040467668
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=a072a04756d94ee3520e17560c007669
著者名
Murakawa, Hideki
村川, 英樹
ムラカワ, ヒデキ
所属機関名
工学研究科
著者名
Ichimura, Shuhei
著者ID
A1161
研究者ID
1000040420468
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=69addadf33dee162520e17560c007669
著者名
Sugimoto, Katsumi
杉本, 勝美
スギモト, カツミ
所属機関名
工学研究科
著者ID
A0913
研究者ID
1000010260647
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=a44fc86204b3e5d2520e17560c007669
著者名
Asano, Hitoshi
浅野, 等
アサノ, ヒトシ
所属機関名
工学研究科
著者名
Umezawa, Shuichi
著者名
Sugita, Katsuhiko
収録物名
Experimental Thermal and Fluid Science
巻(号)
112
ページ
109957
出版者
Elsevier
刊行日
2020-04-01
公開日
2022-05-01
抄録
To achieve efficient energy management in industrial plants, it is crucial to measure the steam flow rates at the various points of consumption. Clamp-on time-of-flight ultrasonic flowmeters are useful devices to measure the steam flow rates in existing pipes. However, it is difficult to accurately measure the steam flow rates because of the large acoustic impedance difference between the pipe material and fluid, strong signal attenuation in the fluid, and high temperature. In addition, the steam wetness increases with heat losses and the presence of liquid film and droplets that creates noise in the detected ultrasonic signals, making it difficult to distinguish the target signals from the noisy ones. Hence, a new signal processing method is proposed to determine the transit time difference, particularly at lower signal-to-noise ratios. Two ultrasonic transducers were used to measure the ultrasonic time-of-flight, which varies depending on the flow rate. The transmitted ultrasonic signals were time-dependent due to the generation of guided waves in the pipe wall. The standard deviations of the target signals increased when the flow regime transitioned from stratified to annular mist flow. The guided waves significantly influence the success ratio of determining the transit time difference between the ultrasonic signals transmitted from the upstream and downstream transducers. Based on the results, the use of the standard deviation of the target signals is proposed for estimating the transit time difference. Further, as the standard deviation varied significantly depending on the flow regime, it can be used to identify the flow regime as well.
キーワード
Ultrasonic signal propagation
Clamp-on
Time-of-flight flowmeter
Guided waves
Steam flow rate
Two-phase flow
カテゴリ
工学研究科
学術雑誌論文
権利
© 2019 Elsevier Inc.
This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
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資源タイプ
journal article
言語
English (英語)
ISSN
0894-1777
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eISSN
1879-2286
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NCID
AA11527517
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関連情報
DOI
https://doi.org/10.1016/j.expthermflusci.2019.109957
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