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TECHNICAL PAPERS

Interfacial Structures and Regime Transition in Co-Current Downward Bubbly Flow

[+] Author and Article Information
S. Kim

Nuclear Engineering, University of Missouri-Rolla, Rolla, MO 65409-0170

S. S. Paranjape, M. Ishii

School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907-1290

J. Kelly

U.S. Nuclear Regulatory Commission, Washington D.C., 20555

J. Fluids Eng 126(4), 528-538 (Sep 10, 2004) (11 pages) doi:10.1115/1.1777229 History: Received May 27, 2003; Revised September 16, 2003; Online September 10, 2004
Copyright © 2004 by ASME
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References

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Wang,  S. K., Lee,  S. J., Jones,  O. C., and Lahey,  R. T., 1987, “3-D Turbulence structure and phase distribution measurements in bubbly two-phase flows,” Int. J. Multiphase Flow, 13, pp. 327–343.
Kashinsky,  O. N., and Randin,  V. V., 1999, “Downward bubbly gas-liquid flow in a vertical pipe,” Nucl. Eng. Des., 25, pp. 109–138.
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Figures

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Schematic diagram of the present experimental loop
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Characteristic images acquired for each flow regime. (a) Bubbly flow: jf=−2.12 m/s & jg=−0.21 m/s, (b) Slug flow: jf=−2.12 m/s & jg=−0.42 m/s, (c) Churn-turbulent flow: jf=−2.12 m/s & jg=−1.07 m/s and (d) Annular flow: jf=−2.12 m/s & jg=−9.17 m/s.
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Flow regime transition boundaries for co-current downward two-phase flow in 25.4 mm ID and 50.8 mm ID pipes
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Local parameter profiles for run 2 in 25.4 mm ID loop. (a) void fraction, (b) interfacial area concentration, (c) bubble velocity, (d) bubble velocity and estimated liquid velocity at port 3.
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Local parameter profiles for run 5 in 50.8 mm ID loop. (a) void fraction, (b) interfacial area concentration, (c) bubble velocity, (d) bubble velocity and estimated liquid velocity at port 3.
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Radial profiles of (a) void fraction and (b) interfacial area concentration for run 8 in 25.4 mm ID loop
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Radial profiles of (a) void fraction and (b) interfacial area concentration for run 8 in 50.8 mm ID test section
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Local parameter profiles for run 14 in 25.4 mm ID loop. (a) group 1 bubble void fraction, (b) group 2 bubble void fraction, (c) group 1 bubble interfacial area concentration, (d) group 2 bubble interfacial area concentration.
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Axial development of area averaged ai for runs 1, 2, 3, 4 and 6 in 25.4 mm ID loop.
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Axial development of area averaged ai
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Axial development of local parameters for run 7 in 25.4 mm ID loop
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Axial development of local parameters for run 14 in 25.4 mm ID loop
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〈j〉 vs. 〈jg〉/〈α〉 plot from data with correlations by Hirao et al. 15
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〈j〉 vs. 〈jg〉/〈α〉 plot; experimental data with present correlations (Circle: Data, Solid Line: Further modified correlation)

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