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

    1 Scopus citations

    Abstract

    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
    Pages1595-1606
    Number of pages12
    ISBN (Print)0791836967, 9780791836965
    DOIs
    StatePublished - Jan 1 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

    Other

    Other4th ASME/JSME Joint Fluids Engineering Conference
    CountryUnited States
    CityHonolulu, HI
    Period7/6/037/10/03

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Fluid Flow and Transfer Processes

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  • Cite this

    Kim, S., Paranjape, S. S., Ishii, M., & Kelly, J. (2003). Interfacial structures and regime transition in co-current downward bubbly flow. In A. Ogut, Y. Tsuji, & M. Kawahashi (Eds.), Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference: Volume 2, Part B, Symposia (pp. 1595-1606). (Proceedings of the ASME/JSME Joint Fluids Engineering Conference; Vol. 2 B). American Society of Mechanical Engineers. https://doi.org/10.1115/fedsm2003-45541