The simulations and experiments of a turbulent bubbly flow are carried out in a cylindrical mixing vessel. Dynamics of the turbulent bubbly flow is visualized using a novel two-phase Particle Image Velocimetry (PIV) with a combination of back lighting, digital masking and fluorescent tracer particles. Using an advanced technique, Mie’s scattering at surfaces of bubbles is totally filtered out and, henceforth, images of tracer particles and of bubbles are obtained with high quality. In parallel to the comprehensive experimental studies, numerical results are obtained from large eddy simulations (LES) of the two-phase air-water mixer. The impeller-induced flow at the blade tip radius is modeled by using sliding mesh method. The results demonstrate the existence of large structures such as tip-vortex tips, and also some finer details. In addition, the stability of the jet is found to be connected with the fluctuations of the tip votices whose dynamics are affected by the presence of bubbles. Numerical results are used to interpret the measurement data and to guide the refinement of consistent theoretical analyses. Such information is invaluable in the development of advanced theories capable of describing bubbly flows in the presence of complex liquid flow. This detailed information is of real significance in facilitating the design and scale-up of practical stirred tanks.
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ASME 2005 Fluids Engineering Division Summer Meeting
June 19–23, 2005
Houston, Texas, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4198-7
PROCEEDINGS PAPER
Large Eddy Simulation and PIV Experiments of a Two Phase Air-Water Mixer
Markus Honkanen,
Markus Honkanen
Tampere University of Technology, Tampere, Finland
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Akbar Koohestany,
Akbar Koohestany
Lappeenranta University of Technology, Lappeenranta, Finland
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Tarmo Hatunen,
Tarmo Hatunen
Lappeenranta University of Technology, Lappeenranta, Finland
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Pentti Saarenrinne,
Pentti Saarenrinne
Tampere University of Technology, Tampere, Finland
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Piroz Zamankhan
Piroz Zamankhan
Lappeenranta University of Technology, Lappeenranta, Finland
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Markus Honkanen
Tampere University of Technology, Tampere, Finland
Akbar Koohestany
Lappeenranta University of Technology, Lappeenranta, Finland
Tarmo Hatunen
Lappeenranta University of Technology, Lappeenranta, Finland
Pentti Saarenrinne
Tampere University of Technology, Tampere, Finland
Piroz Zamankhan
Lappeenranta University of Technology, Lappeenranta, Finland
Paper No:
FEDSM2005-77185, pp. 833-845; 13 pages
Published Online:
October 13, 2008
Citation
Honkanen, M, Koohestany, A, Hatunen, T, Saarenrinne, P, & Zamankhan, P. "Large Eddy Simulation and PIV Experiments of a Two Phase Air-Water Mixer." Proceedings of the ASME 2005 Fluids Engineering Division Summer Meeting. Volume 1: Symposia, Parts A and B. Houston, Texas, USA. June 19–23, 2005. pp. 833-845. ASME. https://doi.org/10.1115/FEDSM2005-77185
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