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Partic. vol. 45 pp. 91-97 (August 2019)
doi: 10.1016/j.partic.2018.05.009

The use of ultrasound probes to monitor multi-phase behavior in opaque systems

Weibin Konga, Shuo Lib, Hui Keb, Huili Zhanga,*, Jan Baeyensa,c,d,*

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    • Non-intrusive ultrasound monitoring technique was used in gas–solid fluidized beds. • The system was reliable to define bubble frequencies and bed height. • Data obtained from ultrasound were in good agreement with those from video-imaging and calculations.


The detection of phenomena occurring inside multiphase opaque reactors is difficult. The present work investigated the novel application of a non-intrusive ultrasound monitoring technique to the complex case of gas–solid fluidized beds. Comparisons of data obtained from video-imaging and theoretical calculations with the ultrasound signal data demonstrate that the ultrasound system is a reliable means of characterizing essential bubble properties by measuring the point bubble frequency, when applying a special protocol during signal treatment. Additional uses in different multiphase systems are further described.

Graphical abstract


Ultrasound monitoring; Non-intrusive; Multiphase system; Opaque