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《Journal of Chemical Industry and Engineering(China)》 2002-04
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APPLICATION OF ULTRASOUND DOPPLER VELOCIMETRY IN MULTIPHASE FLOW MEASUREMENT

WANG Tiefeng,WANG Jinfu,ZHANG Huan and JIN Yong (Department of Chemical Engineering, Tsinghua University,Beijing 100084,China)  
This work aims to investigate the application of ultrasound Doppler velocimetry in multiphase flow.The experimental results show that in the homogeneous liquid-solid system,the amplitude of the received echo energy decreases exponentially with measurement depth,and attenuation rate increases with increase of solid holdup monotonously.A model based on the ultrasound reflection and refraction law and scatter characteristics of particles is proposed to predict the relationship between received echo energy and solid holdup.In the gas-liquid system,liquid velocity and bubble rise velocity can be directly obtained from the velocity profile by Dop 2000 when the bubble number is small,while in medium gas velocity range,FFT must be executed to calculate velocity distribution, resulting in a two-peak distribution,which in turn can be used to obtain liquid velocity and bubble velocity by further data processing.
【CateGory Index】: TQ021
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