Development of a high-speed ultrasonic tomography system for measurements of rising bubbles in a horizontal cross-section

• Murakawa, Hideki

• Shimizu, Tomoyuki

• Eckert, Sven

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 1000 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.

Journal

• Measurement

  Measurement 182 109654-, 2021-09

  Elsevier

Keywords

• Full-matrix capture
• Reflection mode
• Time-series filtering
• Pseudo three-dimensional image
• Bubble column
• Large divergence-angle transducer

Details

• CRID: 1050576811657178112
• NII Article ID: 120007143595
• NII Book ID: AA10464400
• DOI: 10.1016/j.measurement.2021.109654
• ISSN: 1873412X
• ISSN: 02632241
• HANDLE: 20.500.14094/90008530
• Web Site: https://api.elsevier.com/content/article/PII:S0263224121006230?httpAccept=text/xml
• Web Site: https://api.elsevier.com/content/article/PII:S0263224121006230?httpAccept=text/plain
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN