The two fluid model is used to simulate upward gas-liquid bubbly flow through a vertical conduit. Coalescence and breakup of bubbles have been accounted for by embedding the population balance technique in the two fluid model. The simulation enables one to track the axial development of the voidage pattern and the distribution of the bubbles. Thereby it has been possible to propose a new criterion for the transition from bubbly to slug flow regime. The transition criteria depend on (i) the breakage and coalescence frequency, (ii) the bubble volume count below and above the bubble size introduced at the inlet, and (iii) the bubble count histogram. The prediction based on the present criteria exhibits excellent agreement with the experimental data. It has also been possible to simulate the transition from bubbly to dispersed bubbly flow at a high liquid flow rate using the same model.
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September 2009
Research Papers
Transition of Bubbly Flow in Vertical Tubes: New Criteria Through CFD Simulation
A. K. Das,
A. K. Das
Department of Mechanical Engineering,
e-mail: arup@mech.iitkgp.ernet.in
IIT Kharagpur
, 721302, India
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J. R. Thome
J. R. Thome
Search for other works by this author on:
A. K. Das
Department of Mechanical Engineering,
IIT Kharagpur
, 721302, Indiae-mail: arup@mech.iitkgp.ernet.in
P. K. Das
J. R. Thome
J. Fluids Eng. Sep 2009, 131(9): 091303 (12 pages)
Published Online: August 18, 2009
Article history
Received:
January 13, 2009
Revised:
July 4, 2009
Published:
August 18, 2009
Citation
Das, A. K., Das, P. K., and Thome, J. R. (August 18, 2009). "Transition of Bubbly Flow in Vertical Tubes: New Criteria Through CFD Simulation." ASME. J. Fluids Eng. September 2009; 131(9): 091303. https://doi.org/10.1115/1.3203205
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