Application of the ultrasonic technique and high-speed filming for the study of the structure of air-water bubbly flows
Abstract
Multiphase flows are very common in industry, oftentimes involving very harsh environments and fluids. Accordingly, there is a need to determine the dispersed phase holdup using noninvasive fast responding techniques; besides, knowledge of the flow structure is essential for the assessment of the transport processes involved. The ultrasonic technique fulfills these requirements and could have the capability to provide the information required. In this paper, the potential of the ultrasonic technique for application to two-phase flows was investigated by checking acoustic attenuation data against experimental data on the void fraction and flow topology of vertical, upward, air-water bubbly flows in the zero to 15% void fraction range. The ultrasonic apparatus consisted of one emitter/receiver transducer and three other receivers at different positions along the pipe circumference; simultaneous high-speed motion pictures of the flow patterns were made at 250 and 1000 fps. The attenuation data for all sensors exhibited a systematic interrelated behavior with void fraction, thereby testifying to the capability of the ultrasonic technique to measure the dispersed phase holdup. From the motion pictures, basic gas phase structures and different flows patterns were identified that corroborated several features of the acoustic attenuation data. Finally, the acoustic wave transit time wasmore »
- Authors:
-
- Universidade Federal de Itajuba (UNIFEI), Itajuba (Brazil)
- Universidade Tecnologica Federal do Parana (UTFPR), Curitiba (Brazil)
- Universidade Estadual de Campinas (UNICAMP), Campinas (Brazil)
- Publication Date:
- OSTI Identifier:
- 21223039
- Resource Type:
- Journal Article
- Journal Name:
- Experimental Thermal and Fluid Science
- Additional Journal Information:
- Journal Volume: 33; Journal Issue: 7; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0894-1777
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; AIR; WATER; VOID FRACTION; VELOCITY; ATTENUATION; TWO-PHASE FLOW; ULTRASONIC WAVES; BUBBLES; Ultrasonic technique; High-speed filming; Air-water bubbly flow; Flow patterns; Transit time
Citation Formats
Carvalho, R D.M., Venturini, O J, Tanahashi, E I, Neves, F Jr, and Franca, F A. Application of the ultrasonic technique and high-speed filming for the study of the structure of air-water bubbly flows. United States: N. p., 2009.
Web. doi:10.1016/J.EXPTHERMFLUSCI.2009.06.004.
Carvalho, R D.M., Venturini, O J, Tanahashi, E I, Neves, F Jr, & Franca, F A. Application of the ultrasonic technique and high-speed filming for the study of the structure of air-water bubbly flows. United States. https://doi.org/10.1016/J.EXPTHERMFLUSCI.2009.06.004
Carvalho, R D.M., Venturini, O J, Tanahashi, E I, Neves, F Jr, and Franca, F A. 2009.
"Application of the ultrasonic technique and high-speed filming for the study of the structure of air-water bubbly flows". United States. https://doi.org/10.1016/J.EXPTHERMFLUSCI.2009.06.004.
@article{osti_21223039,
title = {Application of the ultrasonic technique and high-speed filming for the study of the structure of air-water bubbly flows},
author = {Carvalho, R D.M. and Venturini, O J and Tanahashi, E I and Neves, F Jr and Franca, F A},
abstractNote = {Multiphase flows are very common in industry, oftentimes involving very harsh environments and fluids. Accordingly, there is a need to determine the dispersed phase holdup using noninvasive fast responding techniques; besides, knowledge of the flow structure is essential for the assessment of the transport processes involved. The ultrasonic technique fulfills these requirements and could have the capability to provide the information required. In this paper, the potential of the ultrasonic technique for application to two-phase flows was investigated by checking acoustic attenuation data against experimental data on the void fraction and flow topology of vertical, upward, air-water bubbly flows in the zero to 15% void fraction range. The ultrasonic apparatus consisted of one emitter/receiver transducer and three other receivers at different positions along the pipe circumference; simultaneous high-speed motion pictures of the flow patterns were made at 250 and 1000 fps. The attenuation data for all sensors exhibited a systematic interrelated behavior with void fraction, thereby testifying to the capability of the ultrasonic technique to measure the dispersed phase holdup. From the motion pictures, basic gas phase structures and different flows patterns were identified that corroborated several features of the acoustic attenuation data. Finally, the acoustic wave transit time was also investigated as a function of void fraction. (author)},
doi = {10.1016/J.EXPTHERMFLUSCI.2009.06.004},
url = {https://www.osti.gov/biblio/21223039},
journal = {Experimental Thermal and Fluid Science},
issn = {0894-1777},
number = 7,
volume = 33,
place = {United States},
year = {Thu Oct 15 00:00:00 EDT 2009},
month = {Thu Oct 15 00:00:00 EDT 2009}
}