Development of a high-speed ultrasonic tomography system for measurements of rising bubbles in a horizontal cross-section
Development of a high-speed ultrasonic tomography system for measurements of rising bubbles in a horizontal cross-section
Murakawa, H.; Tomoyuki, S.; Eckert, S.
Abstract
The present study deals with high-speed ultrasonic tomography (UT) as a powerful tool to characterize the behavior of multiphase flows. A major goal of the work is to improve the temporal resolution for the detection of transit flow structures and time-dependent phenomena such as the incidence of rising gas bubbles. A special transducer with a wide divergence angle of 110° and a vertical height of the measurement volume of approx. 4 mm was developed and tested. The system thus enables the acquisition of cross-sectional images at a frame rate of up to 1,000 frames/s. Scatter noise was eliminated using a time series filtering method. This UT system was applied to a chain of gas bubbles rising in a cylindrical container with an internal diameter of 50 mm. The measurement system provides qualitative observations of the turbulent dynamics of bubbly flows including bubble-bubble interactions, such as the coalescence of individual bubbles.
Keywords: full-matrix capture; reflection mode; time-series filtering; pseudo three-dimensional image; bubble column
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Measurement 182(2021), 109654
DOI: 10.1016/j.measurement.2021.109654
Cited 18 times in Scopus
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Permalink: https://www.hzdr.de/publications/Publ-32869