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Dynamic structures of bubble-driven liquid flows in a cylindrical tank
- Source :
- Experiments in Fluids. 53:21-35
- Publication Year :
- 2011
- Publisher :
- Springer Science and Business Media LLC, 2011.
-
Abstract
- The spatial and temporal structures of turbulent water flows driven by air bubbles in a cylindrical tank were investigated. The time-resolved particle image velocimetry technique was adopted for quantitative visualization. Flow rates of compressed air were changed from 1 to 5 L/min at 0.5 MPa, and the corresponding range of bubble-based Reynolds number (Re) ranged from 8,300 to 21,100. The dynamics of flow structures was further investigated by the time-resolved proper orthogonal decomposition analysis technique. With increasing Re, mean velocity fields driven by the rising bubbles are almost same, but turbulence is dramatically enhanced. Both spatial and temporal modes were quite different with respect to the air flow rates. Three most dominant spatial structures are recirculating flow, bubble-induced motion, and sloshing of free surface, the bigger the latter the higher Re. We found the frequency of sloshing motion from flow visualization and the FFT analysis of temporal modes.
- Subjects :
- Fluid Flow and Transfer Processes
Flow visualization
Materials science
business.industry
Turbulence
Bubble
Airflow
Computational Mechanics
General Physics and Astronomy
Reynolds number
Mechanics
Physics::Fluid Dynamics
symbols.namesake
Optics
Flow (mathematics)
Particle image velocimetry
Mechanics of Materials
Free surface
symbols
business
Subjects
Details
- ISSN :
- 14321114 and 07234864
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Experiments in Fluids
- Accession number :
- edsair.doi...........4cc0fe4018c5d9ace262c412f0106f97