The vertical co-current downward air-water two-phase flow was studied under adiabatic condition. In view of studying the effect of flow area on interfacial structure and regime transition, round tubes of 25.4-mm ID and 50.8-mm ID were employed as test sections. The flow regime map was constructed for each test section by employing a newer approach. Unlike the conventional flow visualization method, the present approach minimizes the subjective judgment in determining the flow regimes. It was found that the flow regime in the co-current downward flow strongly depend on the channel size. The local two-phase flow parameters were acquired by the multi-sensor miniaturized conductivity probe in bubbly flow. They include: the local time-averaged void fraction, interfacial area concentration, bubble velocity and bubble Sauter mean diameter. The area-averaged data acquired by the impedance void meter were analyzed by the drift flux model. Three different distributions parameters were developed for the different ranges of non-dimensional superficial velocity, defined by the ration of total superficial velocity to the drift velocity. The new correlations can be applied to a co-current downward two-phase flow in a wide range of flow regime spanning from bubbly to annular flow.
ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
July 6–10, 2003
Honolulu, Hawaii, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-3696-7
PROCEEDINGS PAPER
Interfacial Structures and Regime Transition in Co-Current Downward Bubbly Flow
S. Kim
,
S. Kim
Purdue University, West Lafayette, IN
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S. S. Paranjape
,
S. S. Paranjape
Purdue University, West Lafayette, IN
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M. Ishii
,
M. Ishii
Purdue University, West Lafayette, IN
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J. Kelly
J. Kelly
U.S. Nuclear Regulatory Commission, Washington, D.C.
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Author Information
S. Kim
Purdue University, West Lafayette, IN
S. S. Paranjape
Purdue University, West Lafayette, IN
M. Ishii
Purdue University, West Lafayette, IN
J. Kelly
U.S. Nuclear Regulatory Commission, Washington, D.C.
Paper No:
FEDSM2003-45541, pp. 1595-1606; 12 pages
Published Online:
February 4, 2009
Citation
Kim, S., Paranjape, S. S., Ishii, M., and Kelly, J. "Interfacial Structures and Regime Transition in Co-Current Downward Bubbly Flow." Proceedings of the ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. Volume 1: Fora, Parts A, B, C, and D. Honolulu, Hawaii, USA. July 6–10, 2003. pp. 1595-1606. ASME. https://doi.org/10.1115/FEDSM2003-45541
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