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Flow in the annular film around a Taylor bubble rising through vertical columns of liquid

Title
Flow in the annular film around a Taylor bubble rising through vertical columns of liquid
Type
Article in International Conference Proceedings Book
Year
2004
Authors
S. Nogueira
(Author)
Other
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M. L. Riethmuller
(Author)
Other
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A. M. F. R. Pinto
(Author)
FEUP
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Conference proceedings International
Pages: 1-7
3 th International Symposium on Two-Phase Flow Modelling and Experimentation
Pisa, September 2004
Scientific classification
FOS: Engineering and technology > Chemical engineering
CORDIS: Technological sciences > Engineering > Chemical engineering
Other information
Abstract (EN): The flow in the annular film around individual Taylor bubbles rising trough stagnant and co-current vertical columns of liquid was studied employing simultaneously particle image velocimetry (PIV) and pulsed shadowgraphy (PST). This combined allows the simultaneous determination of the bubble interface position and the velocity profiles in the liquid film. Experiments were performed with aqueous glycerol solutions in a wide range of viscosities (2x10-3 Pa.s < µ < 0.22 Pa.s), in an acrylic column of 32 mm I.D. The results show that from the nose, the liquid film accelerates and below a certain distance stabilises in velocity and in thickness, becoming a free falling film. Values for the developing length and for the film thickness are reported for the experimental studied conditions. Average velocity profiles in the fully developed region are also presented. A critical Reynolds number (based on the mean absolute velocity in the liquid film) around 400 is reported for the transition from laminar to turbulent regime.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 7
License type: Click to view license CC BY-NC
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C9 - ISTPFME - Pisa-04 144.09 KB
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