Ultrasonic method for measuring the gas holdup of gas-liquid bubbly flow in a small-diameter pipe

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• 作者：Zheng Gong ; An Zhao ; Lu-Sheng Zhai ; Ying-Yu Ren…
• 关键词：Gas ; liquid Two ; phase Bubbly Flow ; Gas Holdup ; Ultrasonic Measurement Method ; High ; speed Camera ; Sound Field Simulation
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：33
• 期：4
• 页码：1170-1180
• 全文大小：2,349 KB
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• 作者单位：Zheng Gong (1)
  An Zhao (1)
  Lu-Sheng Zhai (1)
  Ying-Yu Ren (1)
  Ning-De Jin (1)
  
  1. School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

Based on ultrasonic sound pressure attenuation, the ultrasonic pulse transmission method is proposed for measuring gas holdup in gas-liquid two-phase bubbly flows. Two ultrasonic transducers are positioned on opposite sides of a vertical upward pipe with an inner diameter of 20 mm. To obtain the relationship between ultrasonic attenuation and gas holdup, the mean value of the first pulse sequence of ultrasonic signals is first extracted as the measured signal. We used the quick closing valve method to obtain the gas holdup as the set value. Second, the relationship between the gas holdup and measured ultrasonic signals was established. The experiment result shows that the ultrasonic attenuation rate is significantly different at low and high gas holdups, as indicated by the bubble size images with a high-speed camera. We also investigated the ultrasonic field distribution using numerical simulation. The bubble size has an important effect on the ultrasonic attenuation coefficient, which provides a further physical explanation and reference for the experimental phenomena.