Interfacial Area Transport of Bubbly Flow in a Small Diameter Pipe Under Microgravity Environment

Hazuku, Tatsuya; Takamasa, Tomoji; Hibiki, Takashi; Ishii, Mamoru

Title: Interfacial Area Transport of Bubbly Flow in a Small Diameter Pipe Under Microgravity Environment

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Abstract

Axial developments of one-dimensional void fraction, bubble number density, interfacial area concentration, and Sauter mean diameter of adiabatic nitrogen-water bubbly flows in a 9-mm-diameter pipe were measured under a microgravity environment using an image-processing method. The interfacial area transport mechanism was determined based on visual observation. Marked bubble coalescence occurred when fast-moving bubbles near the channel center overtook and swept up slower-moving bubbles in the vicinity of the channel wall (velocity profile entrainment). Negligible bubble breakup was observed because of weak turbulence under tested flow conditions. Axial changes of measured interfacial area concentrations were compared with the interfacial area transport equation considering the bubble expansion and wake entrainment as observed under a normal gravity environment. The velocity profile entrainment effect under microgravity was likely to be comparable to the wake entrainment effect under normal gravity in the tested flow conditions. This apparently led to insignificant differences between measured interfacial area concentrations and those predicted by the interfacial area transport equation with the wake entrainment model under normal gravity. Possible bubble coalescence mechanisms would differ, however, between normal gravity and microgravity conditions. (authors)

Authors:

Hazuku, Tatsuya; Takamasa, Tomoji ^[1]; Hibiki, Takashi ^[2]; Ishii, Mamoru ^[3]

Tokyo University of Mercantile Marine, 2-1-6 Etchu-jima, Koto-Ku, Tokyo 135-8533 (Japan)
Kyoto University, Kumatori, Sennan, Osaka 590-0494 (Japan)
Purdue University, West Lafayette, IN 47907 (United States)

Publication Date:: Mon Jul 01 00:00:00 EDT 2002

Research Org.:: The ASME Foundation, Inc., Three Park Avenue, New York, NY 10016-5990 (United States)

OSTI Identifier:: 21072864

Resource Type:: Conference

Resource Relation:: Conference: ICONE-10: 10. international conference on nuclear engineering, Arlington - Virginia (United States), 14-18 Apr 2002; Other Information: Country of input: France

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; BUBBLES; COALESCENCE; DENSITY; ENTRAINMENT; EXPANSION; FLUID FLOW; GRAVITATION; IMAGE PROCESSING; NITROGEN; ONE-DIMENSIONAL CALCULATIONS; PIPES; TRANSPORT THEORY; TURBULENCE; VELOCITY; VOID FRACTION; WATER

Citation Formats


                    Hazuku, Tatsuya, Takamasa, Tomoji, Hibiki, Takashi, and Ishii, Mamoru. Interfacial Area Transport of Bubbly Flow in a Small Diameter Pipe Under Microgravity Environment.  United States: N. p., 2002. 
        Web.

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                    Hazuku, Tatsuya, Takamasa, Tomoji, Hibiki, Takashi, & Ishii, Mamoru. Interfacial Area Transport of Bubbly Flow in a Small Diameter Pipe Under Microgravity Environment.  United States.

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                    Hazuku, Tatsuya, Takamasa, Tomoji, Hibiki, Takashi, and Ishii, Mamoru. 2002.  
        "Interfacial Area Transport of Bubbly Flow in a Small Diameter Pipe Under Microgravity Environment".  United States.

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@article{osti_21072864,

  title        = {Interfacial Area Transport of Bubbly Flow in a Small Diameter Pipe Under Microgravity Environment},

  author       = {Hazuku, Tatsuya and Takamasa, Tomoji and Hibiki, Takashi and Ishii, Mamoru},

  abstractNote = {Axial developments of one-dimensional void fraction, bubble number density, interfacial area concentration, and Sauter mean diameter of adiabatic nitrogen-water bubbly flows in a 9-mm-diameter pipe were measured under a microgravity environment using an image-processing method. The interfacial area transport mechanism was determined based on visual observation. Marked bubble coalescence occurred when fast-moving bubbles near the channel center overtook and swept up slower-moving bubbles in the vicinity of the channel wall (velocity profile entrainment). Negligible bubble breakup was observed because of weak turbulence under tested flow conditions. Axial changes of measured interfacial area concentrations were compared with the interfacial area transport equation considering the bubble expansion and wake entrainment as observed under a normal gravity environment. The velocity profile entrainment effect under microgravity was likely to be comparable to the wake entrainment effect under normal gravity in the tested flow conditions. This apparently led to insignificant differences between measured interfacial area concentrations and those predicted by the interfacial area transport equation with the wake entrainment model under normal gravity. Possible bubble coalescence mechanisms would differ, however, between normal gravity and microgravity conditions. (authors)},

  doi          = {},

  url          = {https://www.osti.gov/biblio/21072864},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon Jul 01 00:00:00 EDT 2002},

  month        = {Mon Jul 01 00:00:00 EDT 2002}

}

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