Interfacial structures and regime transition in co-current downward bubbly flow

S. Kim, S. S. Paranjape, M. Ishii, J. Kelly

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Scopus citations


    The vertical cocurrent 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.

    Original languageEnglish (US)
    Title of host publicationProceedings of the 4th ASME/JSME Joint Fluids Engineering Conference
    Subtitle of host publicationVolume 2, Part B, Symposia
    EditorsA. Ogut, Y. Tsuji, M. Kawahashi
    PublisherAmerican Society of Mechanical Engineers
    Number of pages12
    ISBN (Print)0791836967, 9780791836965
    StatePublished - 2003
    Event4th ASME/JSME Joint Fluids Engineering Conference - Honolulu, HI, United States
    Duration: Jul 6 2003Jul 10 2003

    Publication series

    NameProceedings of the ASME/JSME Joint Fluids Engineering Conference
    Volume2 B


    Other4th ASME/JSME Joint Fluids Engineering Conference
    Country/TerritoryUnited States
    CityHonolulu, HI

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Fluid Flow and Transfer Processes


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